What were KT (KT) earnings per share for the three months ended March 31, 2026?

Basic earnings per share were ₩1,460 and diluted earnings per share were ₩1,458. Both figures declined from the prior year’s ₩2,196 basic and ₩2,194 diluted EPS, mirroring the drop in profit attributable to owners of the parent company.

KT Corporation (NYSE: KT) Q1 2026 profit drops as capex and investing cash outflows rise

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

6-K

Rhea-AI Filing Summary

KT Corporation reported condensed consolidated interim results for the three months ended March 31, 2026 under Korean IFRS. Operating revenue was ₩6,778,448 million, slightly below ₩6,845,117 million a year earlier. Operating profit declined to ₩482,701 million from ₩688,771 million, and profit attributable to owners of the parent fell to ₩352,247 million from ₩539,839 million, with basic earnings per share decreasing to ₩1,460 from ₩2,196. Cash flows from operating activities were strong at ₩650,144 million, but heavy investing outflows of ₩1,167,819 million and financing outflows led to a drop in cash and cash equivalents to ₩2,860,116 million from ₩3,506,971 at year-end 2025. Total assets reached ₩43,509,992 million and total equity was ₩19,993,556 million, indicating a solid capital base despite lower quarterly profitability.

Positive

Total comprehensive income increased to ₩703,027 million from ₩573,785 million, supported by large valuation gains on financial assets and cash flow hedges within other comprehensive income.
Equity base strengthened, with total equity rising to ₩19,993,556 million from ₩19,458,023 million, indicating ongoing capital solidity despite lower quarterly profit.
Operating cash flow remained strong at ₩650,144 million for the quarter, providing meaningful internal funding capacity even as earnings declined.

Negative

Profitability weakened materially, as operating profit fell to ₩482,701 million from ₩688,771 million and profit attributable to owners dropped to ₩352,247 million from ₩539,839 million, with basic EPS decreasing from ₩2,196 to ₩1,460.
Free cash flow was negative; heavy investing cash outflows of ₩1,167,819 million and net financing outflows reduced cash and cash equivalents to ₩2,860,116 million from ₩3,506,971 million at December 31, 2025.

Insights

KT shows solid balance sheet but noticeably weaker quarterly profit.

KT Corporation generated operating revenue of ₩6.78 trillion, only slightly below last year, but operating profit dropped to ₩482.7 billion from ₩688.8 billion. Net profit attributable to shareholders declined to ₩352.2 billion, with basic EPS at ₩1,460 versus ₩2,196.

Cash flows from operations were robust at ₩650.1 billion, yet significant investment spending of ₩1,167.8 billion produced a large net cash outflow and reduced cash on hand to ₩2.86 trillion. Total equity rose to ₩19.99 trillion, supported by ₩703.0 billion of total comprehensive income.

The combination of weaker profitability and continued high capital expenditure is noteworthy. Future interim or annual filings for periods after March 31, 2026 will clarify whether the margin pressure and heavy investment are temporary or represent a longer-term reset in earnings power.

Key Figures

Operating revenue: ₩6,778,448 million Operating profit: ₩482,701 million Profit attributable to owners: ₩352,247 million +5 more

8 metrics

Operating revenue ₩6,778,448 million Three-month period ended March 31, 2026; vs ₩6,845,117 million in 2025

Operating profit ₩482,701 million Three-month period ended March 31, 2026; prior year ₩688,771 million

Profit attributable to owners ₩352,247 million Three-month period ended March 31, 2026; prior year ₩539,839 million

Basic EPS ₩1,460 per share Three-month period ended March 31, 2026; vs ₩2,196 in 2025

Operating cash flow ₩650,144 million Cash flows from operating activities, Q1 2026

Investing cash flow ₩1,167,819 million used Cash flows used in investing activities, Q1 2026

Cash and cash equivalents ₩2,860,116 million Balance at March 31, 2026; December 31, 2025 was ₩3,506,971 million

Total equity ₩19,993,556 million Equity at March 31, 2026 including non-controlling interests

Key Terms

Korean IFRS 1034 Interim Financial Reporting, cash flow hedges, right-of-use assets, Pillar Two income taxes, +2 more

6 terms

Korean IFRS 1034 Interim Financial Reporting financial

"in accordance with International Financial Reporting Standards as adopted by the Republic of Korea (Korean IFRS) 1034 Interim Financial Reporting"

cash flow hedges financial

"Valuation gains on cash flow hedges 6 128,144 13,823"

A cash flow hedge is an accounting label companies use when they enter financial contracts—like currency or interest-rate agreements—to protect expected future cash payments or receipts from unpredictable moves. For investors, it signals that the company is trying to smooth out future cash variability (think of locking in a price to avoid surprises), which can reduce reported profit swings but also means the company has exposure to derivative instruments and their associated risks.

right-of-use assets financial

"Right-of-use assets 17 1,492,071 1,538,117"

Right-of-use assets are the rights a company gains to use a physical space or equipment under a lease agreement. They are recorded as assets on the company's balance sheet, reflecting the value of future benefits from the leased item. For investors, these assets provide a clearer picture of a company's obligations and resources related to leasing arrangements, helping to assess its financial health and operational commitments.

Pillar Two income taxes financial

"The Group is subject to Pillar Two income taxes and has reviewed the impact on the financial statements."

supplier finance agreements financial

"the Group has established supplier finance agreements with some suppliers, and suppliers participating in the supplier finance agreement can receive early payment"

Medium Term Note Program financial

"outstanding notes in the amount of USD 100 million with fixed interest rates under Medium Term Note Program (“MTNP”)"

Form 6-K: How Foreign Companies Report to the SEC →

05/28/2026 - 09:50 PM

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

______________________

Form 6-K

______________________

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 OF

THE SECURITIES EXCHANGE ACT OF 1934

For the month of May 2026

Commission File Number 1-14926

______________________

KT Corporation

(Translation of registrant's name into English)

______________________

90, Buljeong-ro,

Bundang-gu, Seongnam-si,

Gyeonggi-do,

Korea

(Address of principal executive offices)

______________________

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F ☒ Form 40-F ☐

EXHIBIT INDEX


Exhibit No.						Description
99.1						Independent Auditor’s Report for FY2026 1Q Consolidated Financial Statements
99.2						Independent Auditor’s Report for FY2026 1Q Separate Financial Statements

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.


			Dated: May 29, 2026
			KT Corporation

			By:			/s/ Sun Wook Kim
			Name: Sun Wook Kim
			Title: IRO

			By:			/s/ Sanghyun Cho
			Name: Sanghyun Cho
			Title: IR Team Leader

KT Corporation and Subsidiaries Condensed Consolidated Interim Financial Statements March 31, 2026 and 2025, and December 31, 2025 ATTACHMENT : INDEPENDENT AUDITOR’S REVIEW REPORT

KT Corporation and Subsidiaries Index March 31, 2026 and 2025, and December 31, 2025 Page(s) Report on Review of Condensed Consolidated Interim Financial Statements ... 1 – 2 Condensed Consolidated Interim Financial Statements Condensed Consolidated Interim Statements of Financial Position…………………… 3 – 4 Condensed Consolidated Interim Statements of Profit or Loss………………………… 5 Condensed Consolidated Interim Statements of Comprehensive Income …………… 6 Condensed Consolidated Interim Statements of Changes in Equity ……………… 7 – 8 Condensed Consolidated Interim Statements of Cash Flows ………………………. 9 – 10 Notes to the Condensed Consolidated Interim Financial Statements ………………… 11 – 72

Report on Review of Consolidated Interim Financial Statements (English Translation of a Report Originally Issued in Korean) To the Shareholders and Board of Directors of KT Corporation Reviewed Financial Statements We have reviewed the accompanying condensed consolidated interim financial statements of KT Corporation and its subsidiaries (collectively referred to as the “Group”). These condensed consolidated interim financial statements consist of the consolidated interim statement of financial position of the Group as at March 31, 2026, and the related consolidated interim statements of profit or loss, comprehensive income, changes in equity and cash flows for the three-month period ended March 31, 2026, and material accounting policy information and other selected explanatory notes, expressed in Korean won. Management's Responsibility for the Financial Statements Management is responsible for the preparation and presentation of these condensed consolidated interim financial statements in accordance with International Financial Reporting Standards as adopted by the Republic of Korea (Korean IFRS) 1034 Interim Financial Reporting, and for such internal control as management determines is necessary to enable the preparation of condensed consolidated interim financial statements that are free from material misstatement, whether due to fraud or error. Auditor's Responsibility Our responsibility is to express a conclusion on these condensed consolidated interim financial statements based on our review. We conducted our review in accordance with quarterly or semi-annual review standards established by the Securities and Futures Commission of the Republic of Korea. A review of interim financial information consists of making inquiries, primarily of persons responsible for financial and accounting matters, and applying analytical and other review procedures. A review is substantially less in scope than an audit conducted in accordance with Korean Standards on Auditing and consequently does not enable us to obtain assurance that we would become aware of all significant matters that might be identified in an audit. Accordingly, we do not express an audit opinion. Conclusion Based on our review, nothing has come to our attention that causes us to believe the accompanying condensed consolidated interim financial statements are not prepared, in all material respects, in accordance with Korean IFRS 1034 Interim Financial Reporting.

Other Matters The consolidated interim statements of profit or loss, comprehensive income, changes in equity and cash flows for the three-month period ended March 31, 2025, presented herein for comparative purposes, were reviewed by Deloitte Anjin LLC whose report dated May 15, 2025. Based on their review, nothing has come to their attention that causes them to believe the accompanying consolidated interim financial statements do not present fairly, in all material respects, the financial position as of March 31, 2025, and its financial performance and its cash flows for the three-month period ended March 31, 2025 in accordance with K-IFRS No.1034 Interim Financial Reporting. The consolidated statement of financial position as at December 31, 2025, and the consolidated statements of profit or loss, comprehensive income, changes in equity and cash flows for the year then ended, not presented herein, were audited by another auditor who expressed an unqualified opinion on those statements on March 13, 2026. The consolidated statement of financial position as at December 31, 2025, presented herein for comparative purposes, is consistent, in all material respects, with the above audited consolidated statement of financial position as at December 31, 2025. Review standards and their application in practice vary among countries. The procedures and practices used in the Republic of Korea to review such financial statements may differ from those generally accepted and applied in other countries. May 15, 2026 Seoul, Korea This report is effective as of May 15, 2026, the review report date. Certain subsequent events or circumstances, which may occur between the review report date and the time of reading this report, could have a material impact on the accompanying condensed consolidated interim financial statements and notes thereto. Accordingly, the readers of the review report should understand that there is a possibility that the above review report may have to be revised to reflect the impact of such subsequent events or circumstances, if any.

KT Corporation and Subsidiaries Condensed Consolidated Interim Statements of Financial Position as at March 31, 2026 and December 31, 2025 (in millions of Korean won) Notes Assets Current assets Cash and cash equivalents 4,30 ₩ 2,860,116 ₩ 3,506,971 Trade and other receivables, net 4,5,30 6,346,879 5,845,149 Other financial assets 4,6,30 2,104,415 1,626,982 Current tax assets 6,446 9,875 Inventories, net 7 537,549 416,135 Current assets held-for-sale 9 2,426 4,316 Other current assets 8 2,669,263 2,568,108 Total current assets 14,527,094 13,977,536 Non-current assets Trade and other receivables, net 4,5,30 2,036,753 2,069,139 Other financial assets 4,6,30 3,816,893 3,362,916 Property and equipment, net 10 13,862,100 14,258,472 Right-of-use assets 17 1,492,071 1,538,117 Investment properties, net 10 2,901,716 2,872,049 Intangible assets, net 10 1,444,577 1,556,621 Investments in associates and joint ventures 11 1,592,151 1,563,946 Deferred tax assets 668,707 660,107 Net defined benefit assets 15 50,230 71,840 Other non-current assets 8 1,117,700 1,017,830 Total non-current assets 28,982,898 28,971,037 Total assets ₩ 43,509,992 ₩ 42,948,573 March 31, 2026 December 31, 2025

KT Corporation and Subsidiaries Condensed Consolidated Interim Statements of Financial Position as at March 31, 2026 and December 31, 2025 (in millions of Korean won) Notes Liabilities Current liabilities Trade and other payables 4,12,30 ₩ 6,933,567 ₩ 6,868,707 Borrowings 4,13,30 3,531,764 2,499,539 Other financial liabilities 4,6,30 423,840 526,093 Current tax liabilities 215,150 237,613 Provisions 14 294,938 312,811 Deferred income 20 61,162 62,175 Other current liabilities 4,8,17 1,181,676 1,185,826 Total current liabilities 12,642,097 11,692,764 Non-current liabilities Trade and other payables 4,12,30 295,621 328,269 Borrowings 4,13,30 7,304,817 8,286,033 Other financial liabilities 4,6,30 593,468 592,599 Net defined benefit liabilities 15 113,746 85,631 Other provisions 14 103,484 105,074 Deferred income 20 136,707 140,615 Deferred income tax liabilities 1,246,651 1,151,424 Other non-current liabilities 4,8,17 1,079,845 1,108,141 Total non-current liabilities 10,874,339 11,797,786 Total liabilities 23,516,436 23,490,550 Equity attribute to owners of the Controlling Company Share capital 1,564,499 1,564,499 Share premium 1,440,258 1,440,258 Retained earnings 18 15,174,497 14,964,332 Accumulated other comprehensive income 882,110 563,279 Other components of equity 19 (873,656) (876,715) 18,187,708 17,655,653 Non-controlling interest 1,805,848 1,802,370 Total equity 19,993,556 19,458,023 Total liabilities and equity ₩ 43,509,992 ₩ 42,948,573 March 31, 2026 December 31, 2025 The above consolidated interim statements of financial position should be read in conjunction with the accompanying notes.

(in millions of Korean won, except per share amounts) Notes Operating revenue 20,28 ₩ 6,778,448 ₩ 6,845,117 Operating expenses 21 6,295,747 6,156,346 Operating profit 28 482,701 688,771 Other income 22 96,364 65,362 Other expenses 22 57,700 37,810 Finance income 23 265,319 128,094 Finance costs 23 281,038 124,359 Share of net profits (losses) of associates and joint ventures 11 6,891 (8,228) 512,537 711,830 Income tax expense 24 124,216 145,031 ₩ 388,321 ₩ 566,799 Profit for the Year Attributable to: Owners of the Parent Company ₩ 352,247 ₩ 539,839 Non-controlling interests 36,074 26,960 Earnings per share attributable to the equity holders of the Parent Company Basic earnings per share 25 ₩ 1,460 ₩ 2,196 Diluted earnings per share 25 1,458 2,194 Profit for the period during the period (in Korean won): KT Corporation and Subsidiaries Condensed Consolidated Interim Statements of Profit or Loss For the three-month periods ended March 31, 2026 and 2025 2026 2025 Profit before Income Tax The above consolidated interim statements of profit or loss should be read in conjunction with the accompanying notes. Three-Month Periods Ended March 31

KT Corporation and Subsidiaries Condensed Consolidated Interim Statements of Comprehensive Income For the three-month periods ended March 31, 2026 and 2025 (in millions of Korean won) Notes 2026 2025 Profit for the period ₩ 388,321 ₩ 566,799 Other comprehensive income (loss) Items that will not be reclassified to profit or loss: Remeasurements of the net defined benefit liabilities 15 (2,443) (3,862) (23) 144 6 321,797 (6,672) Items that are or may be subsequently reclassified to profit or loss: (122) - Valuation gains on cash flow hedges 6 128,144 13,823 (118,935) 1,040 (9,687) 781 Exchange differences on translation of foreign operations (4,025) 1,732 314,706 6,986 Total comprehensive income for the period ₩ 703,027 ₩ 573,785 Total comprehensive income for the period attributable to: Owners of the Parent Company ₩ 673,745 ₩ 556,022 Non-controlling interests 29,282 17,763 The above consolidated interim statements of comprehensive income should be read in conjunction with the accompanying notes. Share of remeasurement of the net defined benefit liabilities of associates and joint ventures Other comprehensive income (loss) from cash flow hedges reclassified to profit or loss Share of other comprehensive income (loss) of associates and joint ventures Other comprehensive income for the period, net of tax Valuation gains (losses) on equity instruments at fair value through other comprehensive income Loss on valuation of debt instruments at fair value through other comprehensive income

K T Co rp or at io n an d Su bs id ia rie s C on de ns ed C on so lid at ed In te rim S ta te m en ts o f C ha ng es in E qu ity Fo r t he th re e- m on th p er io ds e nd ed M ar ch 3 1, 2 02 6 an d 20 25 (in m illi on s of K or ea n w on ) N ot es B al an ce a s at J an ua ry 1 , 2 02 5 ₩ 1, 56 4, 49 9 ₩ 1, 44 0, 25 8 ₩ 13 ,7 79 ,7 76 ₩ 63 ,7 29 ₩ (6 37 ,5 60 ) ₩ 16 ,2 10 ,7 02 ₩ 1, 78 5, 84 7 ₩ 17 ,9 96 ,5 49 C om pr eh en si ve in co m e P ro fit fo r t he p er io d - - 53 9, 83 9 - - 53 9, 83 9 26 ,9 60 56 6, 79 9 R em ea su re m en ts o f n et d ef in ed b en ef it lia bi lit ie s 15 - - (5 21 ) - - (5 21 ) (3 ,3 41 ) (3 ,8 62 ) S ha re o f r em ea su re m en t o f t he n et d ef in ed b en ef it li ab ilit ie s of a ss oc ia te s an d jo in t v en tu re s - - 15 3 - - 15 3 (9 ) 14 4 S ha re o f o th er c om pr eh en si ve in co m e of a ss oc ia te s a nd jo in t v en tu re s - - - 38 5 - 38 5 39 6 78 1 V al ua tio n ga in s (lo ss es ) o n ca sh fl ow h ed ge s 6 - - - 14 ,9 42 - 14 ,9 42 (7 9) 14 ,8 63 V al ua tio n ga in s (lo ss es ) o n fin an ci al in st ru m en ts a t f ai r v al ue th ro ug h ot he r c om pr eh en si ve in co m e 6 - - 1, 08 9 (7 ,3 31 ) - (6 ,2 42 ) (4 30 ) (6 ,6 72 ) E xc ha ng e di ffe re nc es o n tra ns la tio n of fo re ig n op er at io ns - - - 7, 46 6 - 7, 46 6 (5 ,7 34 ) 1, 73 2 To ta l c om pr eh en si ve in co m e fo r t he p er io d - - 54 0, 56 0 15 ,4 62 - 55 6, 02 2 17 ,7 63 57 3, 78 5 Tr an sa ct io ns w ith o w ne rs D iv id en ds p ai d by th e Pa re nt C om pa ny - - (1 22 ,8 36 ) - - (1 22 ,8 36 ) - (1 22 ,8 36 ) D iv id en ds p ai d to n on -c on tro llin g in te re st o f s ub si di ar ie s - - - - - - (1 8, 57 2) (1 8, 57 2) C ha ng e in c on so lid at io n Sc op e - - - - - - (4 3, 14 3) (4 3, 14 3) C ha ng e in o w ne rs hi p in te re st s in s ub si di ar ie s - - - - 5, 01 5 5, 01 5 (6 ,4 64 ) (1 ,4 49 ) A pp ro pr ia tio n of re ta in ed e ar ni ng s re la te d to lo ss o n di sp os al o f t re as ur y st oc k - - (5 7) - 57 - - - A cq ui si tio n of tr ea su ry s to ck - - - - (4 7, 19 7) (4 7, 19 7) - (4 7, 19 7) O th er s 2, 84 6 2, 84 6 (1 ,6 62 ) 1, 18 4 Su bt ot al - - (1 22 ,8 93 ) - (3 9, 27 9) (1 62 ,1 72 ) (6 9, 84 1) (2 32 ,0 13 ) B al an ce a s at M ar ch 3 1, 2 02 5 1, 56 4, 49 9 1, 44 0, 25 8 14 ,1 97 ,4 43 79 ,1 91 (6 76 ,8 39 ) 16 ,6 04 ,5 52 1, 73 3, 76 9 18 ,3 38 ,3 21 ca pi ta l pr em iu m ea rn in gs in co m e of e qu ity To ta l Sh ar e Sh ar e R et ai ne d ot he r c om pr eh en si ve co m po ne nt s N on -c on tr ol lin g To ta l in te re st eq ui ty At tr ib ut ab le to o w ne rs o f t he C on tr ol lin g C om pa ny Ac cu m ul at ed O th er

K T Co rp or at io n an d Su bs id ia rie s C on de ns ed C on so lid at ed In te rim S ta te m en ts o f C ha ng es in E qu ity Fo r t he th re e- m on th p er io ds e nd ed M ar ch 3 1, 2 02 6 an d 20 25 (in m illi on s of K or ea n w on ) N ot es B al an ce a s at J an ua ry 1 , 2 02 6 ₩ 1, 56 4, 49 9 ₩ 1, 44 0, 25 8 ₩ 14 ,9 64 ,3 32 ₩ 56 3, 27 9 ₩ (8 76 ,7 15 ) ₩ 17 ,6 55 ,6 53 ₩ 1, 80 2, 37 0 ₩ 19 ,4 58 ,0 23 C om pr eh en si ve in co m e P ro fit fo r t he y ea r - - 35 2, 24 7 - - 35 2, 24 7 36 ,0 74 38 8, 32 1 R em ea su re m en ts o f n et d ef in ed b en ef it lia bi lit ie s 15 - - (1 ,5 07 ) - - (1 ,5 07 ) (9 36 ) (2 ,4 43 ) S ha re o f r em ea su re m en t o f t he n et d ef in ed b en ef it li ab ilit ie s of a ss oc ia te s an d jo in t v en tu re s - - (2 1) - - (2 1) (2 ) (2 3) S ha re o f o th er c om pr eh en si ve in co m e of a ss oc ia te s a nd jo in t v en tu re s - - - (7 ,2 39 ) - (7 ,2 39 ) (2 ,4 48 ) (9 ,6 87 ) V al ua tio n ga in s (lo ss es ) o n ca sh fl ow h ed ge s 6 - - - 9, 00 7 - 9, 00 7 20 2 9, 20 9 V al ua tio n ga in s on fi na nc ia l i ns tru m en ts a t f ai r v al ue t hr ou gh o th er c om pr eh en si ve in co m e 6 - - 4, 19 5 31 8, 21 2 - 32 2, 40 7 (7 32 ) 32 1, 67 5 E xc ha ng e di ffe re nc es o n tra ns la tio n of fo re ig n op er at io ns - - - (1 ,1 49 ) - (1 ,1 49 ) (2 ,8 76 ) (4 ,0 25 ) To ta l c om pr eh en si ve in co m e fo r t he p er io d - - 35 4, 91 4 31 8, 83 1 - 67 3, 74 5 29 ,2 82 70 3, 02 7 Tr an sa ct io ns w ith o w ne rs D iv id en ds p ai d by th e Pa re nt C om pa ny - - (1 44 ,6 58 ) - - (1 44 ,6 58 ) - (1 44 ,6 58 ) D iv id en ds p ai d to n on -c on tro llin g in te re st o f s ub si di ar ie s - - - - - - (2 2, 92 2) (2 2, 92 2) C ha ng e in o w ne rs hi p in te re st s in s ub si di ar ie s - - - - 48 3 48 3 (2 ,2 03 ) (1 ,7 20 ) A pp ro pr ia tio n of re ta in ed e ar ni ng s re la te d to lo ss o n di sp os al o f t re as ur y st oc k - - (9 1) - 91 - - - D is po sa l o f t re as ur y st oc k - - - - 58 58 - 58 O th er s - - - - 2, 42 7 2, 42 7 (6 79 ) 1, 74 8 Su bt ot al - - (1 44 ,7 49 ) - 3, 05 9 (1 41 ,6 90 ) (2 5, 80 4) (1 67 ,4 94 ) B al an ce a s at M ar ch 3 1, 2 02 6 ₩ 1, 56 4, 49 9 ₩ 1, 44 0, 25 8 ₩ 15 ,1 74 ,4 97 ₩ 88 2, 11 0 ₩ (8 73 ,6 56 ) ₩ 18 ,1 87 ,7 08 ₩ 1, 80 5, 84 8 ₩ 19 ,9 93 ,5 56 Th e ab ov e co ns ol id at ed In te rim s ta te m en ts o f c ha ng es in e qu ity s ho ul d be re ad in c on ju nc tio n w ith th e ac co m pa ny in g no te s. N on -c on tr ol lin g To ta l ca pi ta l pr em iu m ea rn in gs in co m e of e qu ity To ta l in te re st eq ui ty Sh ar e Sh ar e R et ai ne d ot he r c om pr eh en si ve co m po ne nt s At tr ib ut ab le to o w ne rs o f t he C on tr ol lin g C om pa ny Ac cu m ul at ed O th er

KT Corporation and Subsidiaries Condensed Consolidated Interim Statements of Cash Flows For the three-month periods ended March 31, 2026 and 2025 (in millions of Korean won) Notes Cash flows from operating activities Cash generated from operations 26 ₩ 797,952 ₩ 728,367 Interest paid (125,885) (126,472) Interest received 84,390 84,085 Dividends received 3,869 3,410 Income tax paid (110,182) (59,141) Cash flows from operating activities 650,144 630,249 Cash flows used in investing activities Collection of loans 9,238 11,276 Disposals of financial assets at fair value through profit or loss 39,264 47,939 Disposal of financial assets at amortized cost 181,189 129,949 13,605 142 1,860 - 4,472 10,599 Disposals of property, equipment and investment properties 17,941 28,709 Disposals of intangible assets 241 2,312 Disposals of right-of-use assets 20 45 Disposals of derivatives 971 4,256 Increase in cash due to change in consolidation scope - 74,237 Loans granted (2,935) (14,107) Acquisitions of financial assets at fair value through profit or loss (52,820) (15,388) Acquisitions of financial assets at amortized cost (383,947) (310,686) Acquisitions of financial assets at fair value through other comprehensive income - - Acquisitions of investments in associates and joint ventures (14,600) (12,630) Acquisitions of property and equipment and investment properties (559,106) (1,373,759) Acquisitions of intangible assets (313,227) (304,937) Acquisitions of right-of-use assets (25) (45) Cash outflows under derivatives contracts (109,960) - Cash flows used in investing activities (1,167,819) (1,722,088) 2026 2025 Disposals of financial assets at fair value through other compr Disposals of investments in associates and joint ventures Disposals of assets held-for-sale

KT Corporation and Subsidiaries Condensed Consolidated Interim Statements of Cash Flows For the three-month periods ended March 31, 2026 and 2025 (In millions of Korean won) Notes Cash flows used in financing activities 27 Proceeds from borrowings 956,741 2,719,681 Cash inflow from transactions with non-controlling shareholders 280 1,699 Cash inflow from other financing activities - 12,711 Repayments of borrowings (985,816) (2,072,728) Decrease in lease liabilities (100,649) (97,790) Cash outflow under derivatives contracts - (3,724) Acquisition of treasury stock - (47,197) Cash outflow from transactions with non-controlling shareholders (2,000) (3,633) Cash outflow from other financing activities (353) (425) Cash flows used in financing activities (131,797) 508,594 Effect of exchange rate change on cash and cash equivalents 2,617 (439) Net increase (decrease) in cash and cash equivalents (646,855) (583,684) Cash and cash equivalents Beginning of the period 3,506,971 3,716,680 End of the period ₩ 2,860,116 ₩ 3,132,996 The above consolidated Interim statements of cash flows should be read in conjunction with the accompanying notes. 2026 2025

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 11 1 General Information The consolidated financial statements have been prepared by KT Corporation, the “Controlling Company” as defined under Korean IFRS 1110 Consolidated Financial Statements, by consolidating 78 subsidiaries (collectively referred to as the “Group”) including BC Card Co., Ltd. and others as described in Note 1.2. 1.1 The Controlling Company KT Corporation (the “Controlling Company”) commenced operations on January 1, 1982, when it spun off from the Korea Communications Commission (formerly the Korean Ministry of Information and Communications) to provide telecommunication services and to engage in the development of advanced communications services under the Act of Telecommunications of Korea. The address of the Controlling Company’s registered office is 90, Buljeong-ro, Bundang-gu, Seongnam City, Gyeonggi Province, Korea. On October 1, 1997, upon the announcement of the Act on the Management of Government-Invested Institutions and the Privatization Law, the Controlling Company became a government-funded institution under the Commercial Code of Korea. On December 23, 1998, the Controlling Company’s shares were listed on the Korea Exchange. On May 29, 1999, the Controlling Company issued 24,282,195 additional shares and issued American Depository Shares (ADS), which represents new shares and 20,813,311 government-owned shares, on the New York Stock Exchange. On July 2, 2001, additional ADS representing 55,502,161 government-owned shares were issued on the New York Stock Exchange. In 2002, the Controlling Company acquired the entire government-owned shares in accordance with the Korean government’s privatization plan. As at March 31, 2026, the Korean government does not own any shares in the Controlling Company.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 12 1.2 Consolidated Subsidiaries (1) The consolidated subsidiaries as at March 31, 2026 and December 31, 2025, are as follows: Controlling Interest 1 (%) Subsidiary Type of business Location March 31, 2026 December 31, 2025 Closing month KT Telecop Co., Ltd. Security service Korea 92.7% 92.7% December KT Alpha Co., Ltd. 4 Data communication Korea 73.0% 73.0% December KT Service Bukbu Co., Ltd Opening services of fixed line Korea 78.9% 78.9% December KT Service Nambu Co., Ltd. 4 Opening services of fixed line Korea 97.8% 97.8% December KT Commerce Inc. B2C, B2B service and relevant value-added service Korea 100.0% 100.0% December KT Strategic Investment Fund No.3 Investment fund Korea 100.0% 100.0% December KT Strategic Investment Fund No.4 Investment fund Korea 100.0% 100.0% December KT Strategic Investment Fund No.5 Investment fund Korea 100.0% 100.0% December BC-VP Strategic Investment Fund No.1 Investment fund Korea 100.0% 100.0% December BC Card Co., Ltd. Credit card business Korea 69.5% 69.5% December VP Inc. 4 Payment security service for credit card, others Korea 72.2% 72.2% December BC Card China Co., Ltd. Software development and data processing China 100.0% 100.0% December Smartro Co., Ltd. VAN (Value Added Network) business Korea 64.5% 64.5% December KTDS Co., Ltd. 4 System integration and maintenance Korea 91.6% 91.6% December KT M&S Co., Ltd. PCS distribution Korea 100.0% 100.0% December KT GENIE Music Corporation2 Online music production and distribution Korea 36.0% 36.0% December KT MOS Bukbu Co., Ltd. 4 Telecommunication facility maintenance Korea 100.0% 100.0% December KT MOS Nambu Co., Ltd. 4 Telecommunication facility maintenance Korea 98.4% 98.4% December KT Skylife Co., Ltd. 4 Satellite TV Korea 50.5% 50.5% December KT ENA Co., Ltd. TV contents provider Korea 100.0% 100.0% December KT Estate Inc. Residential building development and supply Korea 100.0% 100.0% December KT Investment Management Inc. Asset management, real estate, and consulting services Korea 100.0% 100.0% December KTGDH Co., Ltd. Data center development and related service Korea 100.0% 100.0% December KT Sat Co., Ltd. Satellite communication business Korea 100.0% 100.0% December kt Nasmedia Co., Ltd.2,4 Solution provider and IPTV advertisement sales business Korea 44.7% 44.1% December KT Sports Co., Ltd. Management of sports teams Korea 100.0% 100.0% December KTCS Corporation 2,4 Database and online information provider Korea 34.1% 34.1% December KTIS Corporation 2,4 Database and online information provider Korea 33.4% 33.4% December KT M Mobile Co., Ltd. Special category telecommunications operator and sales of communication device Korea 100.0% 100.0% December KT Investment Co., Ltd. Financing business for new technology Korea 100.0% 100.0% December Next Connect PFV Co., Ltd. Residential building development and supply Korea 100.0% 100.0% December KT Rwanda Networks Ltd. Network install management Rwanda 51.0% 51.0% December AOS Ltd. System integration and maintenance Rwanda 51.0% 51.0% December KT Japan Co., Ltd. Foreign investment business and local counter Japan 100.0% 100.0% December

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 13 Controlling Interest 1 (%) Subsidiary Type of business Location March 31, 2026 December 31, 2025 Closing month work East Telecom LLC Wireless/fixed line internet business Uzbekistan 91.6% 91.6% December KT America, Inc. Foreign investment business and local counter work USA 100.0% 100.0% December PT. BC Card Asia Pacific Software development and delivery Indonesia 99.9% 99.9% December KT Hongkong Telecommunications Co., Ltd. Fixed line telecommunication business Hong Kong 100.0% 100.0% December Korea Telecom Singapore Pte. Ltd. Foreign investment business and local counter work Singapore 100.0% 100.0% December Texnoprosistem LLC Fixed line internet business Uzbekistan 100.0% 100.0% December KT Huimangjieum Co., Ltd. Manufacturing Korea 100.0% 100.0% December K-REALTY RENTAL HOUSING REIT 3 Residential building Korea 88.6% 88.6% December Storywiz Co., Ltd. Contents and software development and supply Korea 100.0% 100.0% December KT Engineering Co., Ltd. Telecommunication facility construction and maintenance Korea 100.0% 100.0% December KT Studio Genie Co., Ltd. Data communication service and data communication construction business Korea 90.9% 90.9% December KTHS Corporation Operation and maintenance of facilities Korea 100.0% 100.0% December kt HCN Co., Ltd. Cable television service Korea 100.0% 100.0% December kt Millie Seojae 2 Book contents service Korea 38.4% 38.4% December KT ES Pte. Ltd. Foreign investment business Singapore 68.8% 68.8% December Epsilon Global Communications PTE. Ltd. Network service industry Singapore 100.0% 100.0% December Epsilon Telecommunications (SP) PTE. Ltd. Fixed line telecommunication business Singapore 100.0% 100.0% December Epsilon Telecommunications (US) PTE. Ltd. Fixed line telecommunication business Singapore 100.0% 100.0% December Epsilon Telecommunications Limited Fixed line telecommunication business UK 100.0% 100.0% December Epsilon Telecommunications (HK) Limited Fixed line telecommunication business Hong Kong 100.0% 100.0% December Epsilon US Inc. Fixed line telecommunication business USA 100.0% 100.0% December Epsilon Telecommunications (BG) EOOD Employee support service Bulgaria 100.0% 100.0% December Nasmedia-KT Alpha Future Growth Strategic Investment Fund Investment fund Korea 100.0% 100.0% December KT Strategic Investment Fund 6 Investment fund Korea 100.0% 100.0% December KT Altimedia Corporation Software development and delivery Korea 100.0% 100.0% December KT Altimedia B.V. Software development and delivery Netherlands 100.0% 100.0% December KT Altimedia Vietnam Software development and delivery Vietnam 100.0% 100.0% December BCCARD VIETNAM LTD. Software sales business Vietnam 100.0% 100.0% December KTP SERVICES INC. Fixed line telecommunication business Philippines 100.0% 100.0% December Hangang Real Estate Investment Trust No. 24 Investment fund Korea 75.0% 75.0% December KT DX VIETNAM COMPANY LIMITED Software development Vietnam 100.0% 100.0% December kt Cloud Co., Ltd. Information and communications development Korea 92.6% 92.6% December PT CRANIUM ROYAL ADITAMA Software development Indonesia 67.0% 67.0% December Open cloud lab Co., Ltd IT consulting service and Telecommunication Korea 100.0% 100.0% December

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 14 Controlling Interest 1 (%) Subsidiary Type of business Location March 31, 2026 December 31, 2025 Closing month equipment sales KT Living, Inc. Residential building management Korea 100.0% 100.0% December K-Realty Qualified Private Real Estate Investment Trust No. 1 3 Real estate management Korea 6.5% 6.5% December AQUA RETAIL VIETNAM COMPANY LIMITED E-voucher issuance and trading business Vietnam 100.0% 100.0% December K-Realty Qualified Private Real Estate Investment Trust No. 4 Real estate management Korea 98.3% 98.3% December BC Strategic Investment Fund 2 Investment fund Korea 100.0% 100.0% December K-Logis Hwaseong Inc Residential building development and supply Korea 80.0% 80.0% December kt netcore Co. Ltd. Telecommunication facility maintenance and service business Korea 100.0% 100.0% December kt p&m Co. Ltd. Information and communications development and electrical engineering construction Korea 100.0% 100.0% December Seongsu269 Development PFV Co, Ltd Investment fund Korea 85.2% 85.2% December Gangnam Station 1307 PFV Co., Ltd. Investment fund Korea 60.3% 60.3% December 1 Sum of the interests owned by the Controlling Company and subsidiaries. 2 Although the Controlling Company owns less than 50% of the interest in kt Nasmedia Co., Ltd., KTCS Corporation, KTIS Corporation, kt Millie Seojae, and KT GENIE Music Corporation, these entities are consolidated as the Controlling Company can exercise the majority of voting rights in its decision-making process at all times, based on voting patterns at previous shareholders’ meetings. 3 Although the Controlling Company owns less than 50% of the interest in K-Realty Qualified Private Real Estate Investment Trust No. 1, this entity is consolidated by comprehensively considering the criteria for determining control, such as 'power', 'variable profit', and 'relationship between power and variable profit', rather than simply judging by the interests owned by the Controlling Company. 4 The number of treasury stock held by subsidiaries are deducted from the total number of shares when calculating the controlling percentage interest.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 15 (2) Summarized information for consolidated subsidiaries as at March 31, 2026 and December 31, 2025, and for the three-month periods ended March 31, 2026 and 2025, is as follows: (in millions of Korean won) March 31, 2026 Three-month period ended March 31, 2026 Total assets Total liabilities Operating revenues Profit(loss) for the period KT Telecop Co., Ltd. 408,864 244,441 142,805 5,278 KT Alpha Co., Ltd. 473,175 173,419 96,159 11,426 KT Service Bukbu Co., Ltd. 56,248 49,360 58,863 1,245 KT Service Nambu Co., Ltd. 100,255 91,406 96,100 1,315 BC Card Co., Ltd. 1 6,747,540 4,766,177 873,666 58,070 KT Nasmedia Co., Ltd.1 385,733 190,298 26,450 3,658 KTDS Co., Ltd. 279,195 116,567 159,885 6,081 KT M&S Co., Ltd. 273,737 187,044 251,200 6,368 KT MOS Bukbu Co., Ltd. 51,233 31,802 25,325 221 KT MOS Nambu Co., Ltd. 51,755 26,067 25,381 268 KT Skylife Co., Ltd 1 964,359 414,144 238,980 1,804 KT Estate Inc. 1 3,307,509 1,577,646 237,395 19,601 KT GDH Co., Ltd. 4,671 847 87 (538) KT Sat Co., Ltd. 706,464 31,985 47,389 10,167 KT Sports Co., Ltd. 40,619 21,069 18,088 (5,337) KT M Mobile Co., Ltd. 223,771 100,830 99,319 1,122 KT Investment Co., Ltd. 1 70,498 39,378 2,876 1,188 KTCS Corporation 1 438,417 211,362 235,761 8,127 KTIS Corporation 448,509 210,450 154,904 4,768 Next Connect PFV 969,339 281,848 17,435 2,905 KT Japan Co., Ltd. 1 1,867 3,316 774 (23) KT America, Inc. 8,164 1,109 6,126 202 KT Rwanda Networks Ltd. 2 116,380 159,310 5,247 (4,521) AOS Ltd. 2 19,262 19,633 3,648 1,844 KT Hong Kong Telecommunications Co., Ltd. 10,593 2,264 3,455 212 KT Huimangjieum 1 11,696 3,432 4,378 538 KT Engineering Co., Ltd. 87,583 33,064 27,371 (3,339) KT Studio Genie Co., Ltd. 1 781,328 170,251 119,965 2,620 East Telecom LLC 1 89,434 39,133 9,095 1,233 KT ES Pte. Ltd. 1 79,145 75,585 26,657 (5,305) KTP SERVICES INC. 2,161 23 23 (74)

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 16 1 As intermediate controlling companies, financial information from their consolidated financial statements is presented. 2 Convertible preferred stock issued by subsidiaries as at the end of the reporting period is included in liabilities. (in millions of Korean won) December 31, 2025 Three-month period ended March 31, 2025 s Total assets Total liabilities Operating revenues Profit(loss) for the period KT Telecop Co., Ltd. ₩ 393,333 234,285 144,046 5,265 KT Alpha Co., Ltd. 495,896 192,822 96,474 10,817 KT Service Bukbu Co., Ltd. 59,502 53,859 56,345 (137) KT Service Nambu Co., Ltd. 107,727 99,990 92,795 (7,706) BC Card Co., Ltd. 1 6,558,304 4,626,053 871,989 35,157 KT Nasmedia Co., Ltd.1 440,266 238,576 31,165 2,966 KTDS Co., Ltd. 1 311,710 146,073 153,652 9,032 KT M&S Co., Ltd. 238,108 157,783 213,316 4,429 KT MOS Bukbu Co., Ltd. 54,039 34,830 23,346 (326) KT MOS Nambu Co., Ltd. 54,657 29,236 24,060 (31) KT Skylife Co., Ltd. 1 975,400 413,080 242,881 2,798 KT Estate Inc. 1 3,266,800 1,534,793 134,743 (2,295) KT GDH Co., Ltd. 7,852 1,181 859 106 KT Sat Co., Ltd. 696,796 32,436 43,565 6,292 KT Sports Co., Ltd. 32,098 7,205 16,499 (2,922) KT M Mobile Co., Ltd. 222,683 90,445 91,800 3,124 KT Investment Co., Ltd. 1 73,066 43,133 1,343 (65) KTCS Corporation 1 470,973 245,806 235,235 5,295 (in millions of Korean won) March 31, 2026 Three-month period ended March 31, 2026 Total assets Total liabilities Operating revenues Profit(loss) for the period KT Altimedia Corporation 1 43,229 9,754 10,344 1,189 KT DX VIETNAM COMPANY LIMITED 1,360 172 351 (40) kt Cloud Co., Ltd. 1 2,598,697 1,033,369 250,094 3,922 K-Realty Qualified Private Real Estate Investment Trust No. 1 77,548 50,291 1,143 (64) AQUA RETAIL VIETNAM COMPANY LIMITED 311 - - - kt netcore Co. Ltd 147,294 89,124 116,609 (6,598) kt p&m Co. Ltd 32,712 19,327 18,323 762

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 17 (in millions of Korean won) December 31, 2025 Three-month period ended March 31, 2025 s Total assets Total liabilities Operating revenues Profit(loss) for the period KTIS Corporation 449,527 211,060 153,299 4,549 Next Connect PFV 967,898 279,246 276,281 140,620 KT Japan Co., Ltd. 1 1,900 3,271 866 42 KT America, Inc. 7,080 589 1,918 68 KT Rwanda Networks Ltd. 2 112,981 149,440 5,558 (8,084) AOS Ltd. 2 17,996 20,221 2,922 1,188 KT Hong Kong Telecommunications Co., Ltd. 9,942 2,202 2,814 62 KT Huimangjieum 1 11,134 3,408 6,311 1,218 KT Engineering Co., Ltd. 153,146 95,252 33,132 (10,447) KT Studio Genie Co., Ltd. 1 791,790 181,688 112,514 2,869 East Telecom LLC 1 88,259 39,227 9,837 1,958 KT ES Pte. Ltd. 1 76,013 69,059 24,603 (309) KTP SERVICES INC. 2,179 10 - (62) KT Altimedia Corporation 1 42,655 9,300 8,043 (489) KT DX VIETNAM COMPANY LIMITED 1,457 291 181 (74) kt Cloud Co., Ltd. 1 2,659,479 1,099,355 249,092 19,344 K-Realty Qualified Private Real Estate Investment Trust No. 1 77,384 50,062 1,159 (147) AQUA RETAIL VIETNAM COMPANY LIMITED 296 - 358 (239) kt netcore. Co. Ltd. 174,021 109,253 92,655 (14,536) kt p&m Co. Ltd. 32,513 19,889 15,739 (350) 1 As intermediate controlling companies, financial information from their consolidated financial statements is presented. 2 Convertible preferred stock issued by subsidiaries as at the end of the reporting period is included in liabilities.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 18 2. Material Accounting Policies 2.1 Basis of Preparation The Group maintains its accounting records in Korean won and prepares statutory financial statements in the Korean language (Hangul) in accordance with International Financial Reporting Standards as adopted by the Republic of Korea (K-IFRS). The accompanying consolidated financial statements have been condensed, reformatted, and translated into English from the original Korean language financial statements. The consolidated interim financial statements of the Group for the three-month period ended March 31, 2026, have been prepared in accordance with Korean IFRS 1034 Interim Financial Reporting. In order to understand the consolidated interim financial statements, the annual consolidated financial statements as at December 31, 2025 prepared in accordance with IFRS should be used together. 2.2 Changes in Accounting Policy and Disclosures (1) New and amended standards and interpretations adopted by the Group The Group has applied the following standards and amendments for the first time for their annual reporting period commencing January 1, 2026. - Amendments to Korean IFRS 1109 Financial Instruments and Korean IFRS 1107 Financial Instruments: Disclosures Korean IFRS 1109 Financial Instruments and Korean IFRS 1107 Financial Instruments: Disclosures have been amended to respond to recent questions arising in practice, and to include new requirements. clarify the date of recognition and derecognition of some financial assets and liabilities, with a new exception for some financial liabilities settled through an electronic cash transfer system; clarify and add further guidance for assessing whether a financial asset meets the solely payments of principal and interest (SPPI) criterion; add new disclosures of impact on the entity and the extent to which the entity is exposed for each type of financial instruments if the timing or amount of contractual cash flow changes due to amendment of contract term; and update the disclosures for equity instruments designated at fair value through other comprehensive income (FVOCI). - Annual Improvements to Korean IFRS -Volume 11 Annual Improvements to Korean IFRS -Volume 11 should be applied for annual periods beginning on or after January 1, 2026. Korean IFRS 1101 First-time Adoption of International Financial Reporting Standards: Hedge accounting by a first-time adopter Korean IFRS 1107 Financial Instruments: Disclosures: Gain or loss on derecognition and implementation guidance Korean IFRS 1109 Financial Instruments: Derecognition of lease liabilities and definition of transaction price Korean IFRS 1110 Consolidated Financial Statements: Determination of a ‘de facto agent’ Korean IFRS 1007 Statement of Cash Flows: Cost method

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 19 - Amendments to Korean IFRS 1109 Financial Instruments and Korean IFRS 1107 Financial Instruments: Disclosures - Contracts Referencing Nature-dependent Electricity Contracts referencing nature-dependent electricity are defined contracts that expose an entity to variability in the underlying amount of electricity because the source of electricity generation depends on uncontrollable natural conditions (for example, the weather). The amendments clarify that ‘contracts to buy or sell such electricity’ are assessed for eligibility under the own-use exemption. In addition, the amendments modify hedge accounting requirements by allowing an entity to designate as the hedged item a variable nominal amount of forecast electricity transactions that reflect the nature-dependent variability of electricity and introduce additional disclosure requirements. (2) New and amended standards not yet adopted by the Group The following new and amended accounting standards and interpretations have been issued but are not mandatory for the annual reporting period ending on December 31, 2026.: - Korean IFRS 1118 Presentation and Disclosure in Financial Statements Korean IFRS 1118 Presentation and Disclosure in Financial Statements replaces Korean IFRS 1001 Presentation of Financial Statements. Korean IFRS 1118 is expected to increase comparability of the financial performance of similar entities by providing users with more useful information for analyzing and comparing the entity’s performance based on the income statement. Korean IFRS 1118 should be first applied for annual periods beginning on or after January 1, 2027, and earlier application is permitted. In accordance with Korean IFRS 1008 Accounting Policies, Changes in Accounting Estimates and Errors, the comparative information for the year ended December 31, 2026, shall be restated under Korean IFRS 1118 as the Group is required to apply the standard retrospectively. When the Group prepares its financial statements by applying Korean IFRS 1118, the following material accounting policies are expected to result in significant differences compared to the current financial statements. These items do not include all differences that may arise in the future and may be subject to change based on the results of additional analysis. Changes in presentation of income statement Introduction of disclosure of management-defined performance measures Changes in classification of cash flows The Group is reviewing the impact of the above-listed amendments on the financial statements.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 20 2.3 Accounting Policies The material accounting policies and methods of computation used in the preparation of the consolidated interim financial statements are consistent with those of the consolidated financial statements for the year ended December 31, 2025, except for the changes resulting from the application of amendments and enactments of standards described in Note 2.2 (1) and as detailed below. 2.3.1 Income Tax Expense Income tax expense for the interim period is recognized based on management’s best estimate of the weighted average annual income tax rate expected for the full financial year. The estimated average annual effective income tax rate is applied to the pre-tax income of the interim period. The Group is subject to Pillar Two income taxes and has reviewed the impact on the financial statements. As a result of this assessment, The Group is within the scope of the Pillar Two model rules. The Group recognized an additional income tax expenses in relation to the rules and applied the exception to recognizing and disclosing information about deferred tax and assets and liabilities related to Pillar Two income Taxes. 3. Critical Accounting Estimates and Assumptions The preparation of financial statements requires the Group to make estimates and assumptions about the future. Management also needs to exercise judgment in applying the Group’s accounting policies. Estimates and assumptions are evaluated continuously and are based on historical experience and other factors, including reasonable expectations of future events under the given circumstances. As the resulting accounting estimates will, by definition, rarely equal the actual results, they involve a significant risk of resulting in material adjustments.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 21 4. Financial Instruments by Category Financial instruments by category as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 Financial assets Financial assets at amortized cost Financial assets at FVTPL Financial assets at FVOCI Derivatives used for hedging Total Cash and cash equivalents ₩ 2,860,116 - - - 2,860,116 Trade and other receivables 8,141,680 - 241,952 - 8,383,632 Other financial assets 1,675,030 914,623 2,851,607 480,048 5,921,308 (in millions of Korean won) March 31, 2026 Financial liabilities Financial liabilities at amortized cost Financial liabilities at FVTPL Derivatives used for hedging Others Total Trade and other payables1 ₩ 6,813,369 - - - 6,813,369 Borrowings 10,836,581 - - - 10,836,581 Other financial liabilities 1,013,662 - 3,646 - 1,017,308 Lease liabilities - - - 1,393,701 1,393,701 1 Amounts related to employee benefit plans are excluded in Trade and other payables. (in millions of Korean won) December 31, 2025 Financial assets Financial assets at amortized cost Financial assets at FVTPL Financial assets at FVOCI Derivatives used for hedging Total Cash and cash equivalents ₩ 3,506,971 - - - 3,506,971 Trade and other receivables 7,806,644 - 107,644 - 7,914,288 Other financial assets 1,476,527 774,557 2,423,277 315,537 4,989,898 (in millions of Korean won) December 31, 2025 Financial liabilities Financial liabilities at amortized cost Financial liabilities at FVTPL Derivatives used for hedging Others Total Trade and other payables1 ₩ 6,693,177 - - - 6,693,177 Borrowings 10,785,572 - - - 10,785,572 Other financial liabilities 999,020 105,810 13,862 - 1,118,692 Lease liabilities - - - 1,423,206 1,423,206 1 Amounts related to employee benefit plans are excluded in Trade and other payables.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 22 5. Trade and Other Receivables (1) Trade and other receivables as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 Total amounts Provision for impairment Present value discount Carrying amount Current assets Trade receivables ₩ 3,562,799 (392,804) (7,243) 3,162,752 Other receivables 3,291,185 (105,648) (1,410) 3,184,127 Total ₩ 6,853,984 (498,452) (8,653) 6,346,879 Non-current assets Trade receivables ₩ 277,944 (1,257) (13,447) 263,240 Other receivables 1,864,805 (81,650) (9,642) 1,773,513 Total ₩ 2,142,749 (82,907) (23,089) 2,036,753 (in millions of Korean won) December 31, 2025 Total amounts Provision for impairment Present value discount Carrying amount Current assets Trade receivables ₩ 3,331,715 (385,739) (7,959) 2,938,017 Other receivables 3,014,911 (104,747) (3,032) 2,907,132 Total ₩ 6,346,626 (490,486) (10,991) 5,845,149 Non-current assets Trade receivables ₩ 330,619 (1,290) (15,703) 313,626 Other receivables 1,850,564 (86,270) (8,781) 1,755,513 Total ₩ 2,181,183 (87,560) (24,484) 2,069,139

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 23 (2) Details of other receivables as at March 31, 2026 and December 31, 2025, are as follows: 1 As at March 31, 2026, credit sales asset of ₩ 1,774,302 million (December 31, 2025: ₩ 1,550,049 million) held by BC Card Co., Ltd. are included. (3) The maximum exposure of trade and other receivables to credit risk is the carrying amount of each class of receivables mentioned above as at March 31, 2026. (4) The Group classifies a certain portion of trade receivables as financial assets at fair value through other comprehensive income, based on business model for managing the asset and the cash flow characteristics of the contract. (in millions of Korean won) March 31, 2026 December 31, 2025 Loans ₩ 54,528 61,915 Receivables 1 2,668,053 2,458,065 Accrued income 116,644 47,802 Refundable deposits 235,518 241,287 Loans receivable 1,769,365 1,753,505 Finance lease receivables 253,535 245,055 Others 47,295 46,033 Less: Provision for impairment (187,298) (191,017) Total ₩ 4,957,640 4,662,645

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 24 6. Other Financial Assets and Liabilities (1) Details of other financial assets and liabilities as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Other financial assets Financial assets at amortized cost 1 ₩ 1,675,030 1,476,527 Financial assets at fair value through profits or loss 1,2 914,623 774,557 Financial assets at fair value through other comprehensive income 2,851,607 2,423,277 Derivatives used for hedging 480,048 315,537 Less: Non-current (3,816,893) (3,362,916) Current ₩ 2,104,415 1,626,982 Other financial liabilities Financial liabilities at amortized cost 3,4 ₩ 1,013,662 999,020 Financial liabilities at FVTPL - 105,810 Derivatives used for hedging 3,646 13,862 Less: Non-current (593,468) (592,599) Current ₩ 423,840 526,093 1 As at March 31, 2026, the Group’s financial instruments amount to ₩ 119,975 million (December 31, 2025: ₩ 118,946 million) and consist of checking account deposits, time deposits, and others which are subject to withdrawal restrictions. 2 As at March 31, 2026, the Group provided investments in Korea Software Financial Cooperative and others amounting to ₩ 10,789 million (December 31, 2025: ₩ 10,695 million) as a collateral in exchange for the payment guarantee provided by the Korea Software Financial Cooperative and others. 3 The amount includes liabilities related to the obligation to acquire additional shares in Epsilon Global Communications Pte. Ltd. and kt Cloud Co., Ltd. (Note 16). 4 The amount includes liabilities convertible preferred Stock issued by kt Cloud Co., Ltd. (Note 16).

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 25 (2) Financial Assets at fair value through profit or loss 1) Details of financial assets at fair value through profit or loss as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Equity instruments (Listed) ₩ 486 3,562 Equity instruments (Unlisted) 45,198 46,955 Debt instruments 867,860 723,978 Derivatives held for trading 1,079 62 Total 914,623 774,557 Less: Non-current (707,939) (709,412) Current ₩ 206,684 65,145 2) The maximum exposure to credit risks for debt instruments of financial assets at fair value through profit or loss is the carrying amount of each class of debt instruments above as at March 31, 2026. (3) Financial Assets at fair value through other comprehensive income 1) Details of financial assets at fair value through other comprehensive income as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Equity instruments (Listed) ₩ 2,474,960 2,044,789 Equity instruments (Unlisted) 370,627 372,341 Debt instruments 6,020 6,147 Total 2,851,607 2,423,277 Less: Non-current (2,851,607) (2,423,277) Current ₩ - - 2) Upon disposal of these equity investments, any balance within the accumulated other comprehensive income is reclassified not to profit or loss, but to retained earnings. Upon disposal of these debt investments, the remaining balance of the accumulated other comprehensive income is reclassified to profit or loss.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 26 (4) Derivatives used for Hedging 1) Details of valuation of derivatives used for hedging as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Assets Liabilities Assets Liabilities Interest rate swap ₩ 2,716 - 1,810 - Currency swap 1 477,332 3,646 313,727 13,862 Total 480,048 3,646 315,537 13,862 Less: Non-current (227,911) (596) (202,144) (13,862) Current ₩ 252,137 3,050 113,393 - 1 The currency swap contract is to hedge the risk of variability in cash flow from the borrowings due to changes in interest rate and foreign exchange rate and the expected maximum period for the Group to be exposed to risks of cash flow fluctuation by hedged items is until September 7, 2034. The entire fair value of a hedging derivative is classified as a non-current asset or liability if the remaining maturity of the hedged item exceeds 12 months and, as a current asset or liability, if the maturity of the hedged item is within 12 months. 2) Details of valuation gains and losses on the derivative instruments for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Type of transaction Valuation gain Valuation loss Other comprehensive Income(loss)1 Valuation gain Valuation loss Other comprehensive Income(loss)1 Interest rate swap ₩ 13 - 817 10 - (373) Currency swap 162,212 39 11,723 7,584 8,561 20,069 Total ₩ 162,225 39 12,540 7,594 8,561 19,696 1 The amounts are before adjustments for deferred income tax and allocations to non-controlling interests and have been directly reflected in equity. 3) The effective portion recognized in profit or loss related to cash flow hedges amounts to valuation gains of ₩ 175,050 million as other comprehensive income for the three-month period ended March 31, 2026 (for the three- month period ended March 31, 2025: ₩ 18,622 million). The ineffective portion recognized in profit or loss related to cash flow hedges amounts to valuation gains of ₩ 400 million as current profit or loss for the three-month period ended March 31, 2026 (for the three-month period ended March 31, 2025: ₩ 341 million). In addition, the valuation loss reclassified from other comprehensive income to profit or loss amounts to ₩ 162,509 million for the three- month period ended March 31, 2026 (for the three-month period ended March 31, 2025: valuation loss of ₩ 1,074 million).

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 27 (5) Financial Liabilities at fair value through profit or loss 1) Details of financial liabilities at fair value through profit or loss as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Derivatives held for trading 1 ₩ - 105,810 1 The Group signed a shareholders’ agreement with financial investors participating in the paid-in capital increase of K Bank Inc. for the three-month period ended March 31, 2026. According to the Drag-Along Right, if K Bank Inc. fails to be listed on the terms agreed upon for the date of completion of the acquisition, financial investors may exercise the Drag-Along right to the Group, and the Group may comply or exercise the right to claim for sale. If financial investors exercise the Drag-Along Right, the Group must exercise the right to claim for sale or guarantee the return on the terms agreed upon by financial investors. 2) The valuation gain and loss on financial liabilities at fair value through profit or loss for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Valuation gain Valuation loss Valuation gain Valuation loss Derivatives liabilities held for trading ₩ - 4,582 8,461 - 7. Inventories Inventories as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Acquisition cost Valuation allowance Carrying amount Acquisition cost Valuation allowance Carrying amount Merchandise ₩ 536,868 (24,026) 512,842 421,615 (31,188) 390,427 Others 24,762 (55) 24,707 25,763 (55) 25,708 Total ₩ 561,630 (24,081) 537,549 447,378 (31,243) 416,135 Cost of inventories recognized as expenses for the three-month period ended March 31, 2026 amounts to ₩ 1,043,564 million (for the three-month period ended March 31, 2025: ₩ 943,415 million) and reversal valuation loss on inventory amounts to ₩ 7,163 million for the three-month period ended March 31, 2026 (for the three-month period ended March 31, 2025: ₩ 23,703 million).

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 28 8. Other Assets and Liabilities Other assets and liabilities as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Other assets Advance payments ₩ 220,330 177,929 Prepaid expenses 366,088 262,230 Contract cost 2,124,861 2,099,088 Contract assets 1,057,573 1,026,260 Others 18,111 20,431 Less: Non-current (1,117,700) (1,017,830) Current ₩ 2,669,263 2,568,108 Other liabilities Advances received 1 ₩ 408,415 390,216 Withholdings 152,870 140,817 Unearned revenue 1 41,325 42,197 Lease liabilities 1,393,701 1,423,206 Contract liabilities 239,185 239,738 Others 26,025 57,793 Less: Non-current (1,079,845) (1,108,141) Current ₩ 1,181,676 1,185,826 1 The amounts include adjustments arising from adoption of Korean IFRS 1115 Revenue from Contracts with Customers (Note 20). 9. Assets Held-for-sale For the period ended March 31, 2026, the Group classified ₩2,426 million of certain tangible and intangible assets and other assets as non-current assets held for sale, as it had decided to dispose them. The asset was measured at net fair value in accordance with K-IFRS 1105. The details of the assets held for sale are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Machinery and equipment ₩ - 1,890 Other Intangible assets 926 926 Others 1,500 1,500 Total ₩ 2,426 4,316

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 29 10. Property and Equipment, Investment Properties, and Intangible Assets (1) Changes in property and equipment for three-month period ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Beginning, net ₩ 14,258,472 14,825,814 Acquisition and capital expenditure 382,421 393,227 Disposal and termination (27,685) (33,677) Depreciation (690,970) (709,846) Transfer to investment properties (48,378) (7,748) Changes in consolidation scope - (2,930) Impairment Loss (15) - Others 1 (11,745) (66,700) Ending, net ₩ 13,862,100 14,398,140 1 Amounts include transfers to intangible assets. (2) Changes in investment properties for the three-month period ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Beginning, net ₩ 2,872,049 2,299,616 Acquisition and capital expenditure 1,102 564,195 Disposal (1,469) - Depreciation (17,442) (18,171) Transfer from property, plant and equipment 48,378 7,748 Changes in consolidation - (3,430) Others (902) 3,437 Ending, net ₩ 2,901,716 2,853,395 (3) As at March 31, 2026, the Group (Lessor) has entered into a non-cancellable operating lease contract for real estate. The future minimum lease payments under this contract amount to ₩ 210,568 million for one year or less, ₩ 389,467 million for more than one year and less than five years, ₩ 184,024 million for over five years, and ₩ 784,059 million in total.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 30 (4) Changes in intangible assets for the three-month period ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Beginning, net ₩ 1,556,621 1,862,740 Acquisition and capital expenditure 1 49,191 95,928 Disposal and termination (937) (2,540) Amortization (150,488) (150,238) Impairment 20 - Changes in consolidation scope - (2,471) Others (9,830) (7,432) Ending, net ₩ 1,444,577 1,795,987 1 Amounts include transfers from property and equipment. (5) The carrying amount of membership rights with an indefinite useful life not subject to amortization, except for goodwill, is ₩ 205,144 million as at March 31, 2026 (December 31, 2025: ₩ 201,308 million). (6) Goodwill is allocated to the Group’s cash-generating units, which are identified by operating segments. As at March 31, 2026, the goodwill allocated to each cash-generation unit is as follows: (in millions of Korean won) Cash-Generating Unit Amount Mobile services ₩ 65,057 BC Card Co., Ltd.. 41,234 kt Millie Seojae 54,725 KT Telecop Co., Ltd. 15,418 KT MOS Bukbu Co., Ltd. and others 32,793 Total ₩ 209,227 The recoverable amount of goodwill has been determined based on the fair value obtained by calculating the value in use or deducting the cost of disposal. The value in use was calculated using pre-tax cash flow estimates based on financial budgets, such as the budget for the next five years. Cash flows after the estimated period were estimated using the expected growth rate, and the growth rate does not exceed the long-term average growth rate of the industry to which the cash-generating unit belongs. The Group has determined revenue growth rate based on past performance and expectations of future market changes. The Group has determined pre-tax cash flow estimates based on past earnings and market growth forecasts, and the discount rate used reflects the specific risks associated with related operations.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 31 11. Investments in Associates and Joint Ventures (1) Details of associates as at March 31, 2026 and December 31, 2025, are as follows: Percentage of ownership (%) Location Closing month March 31, 2026 December 31, 2025 KIF Investment Fund 33.3% 33.3% Korea December K Bank Inc. 31.2% 33.7% Korea December HD Hyundai Robotics Co., Ltd. 1 10.0% 10.0% Korea December Megazone Cloud Corporation 1 6.8% 6.8% Korea December IGIS No. 468-1 General Private Real Estate Investment Company 44.6% 44.6% Korea December KT-DSC Creative Economy Youth Start- up Investment Fund 28.6% 28.6% Korea December IGIS Professional Investors Private Investment Real Estate Investment LLC No. 395 35.3% 35.3% Korea December 1 Although the Group holds less than 20% interest in ordinary shares as at March 31, 2026, these entities are included in investments in associates as the Group exerts significant influence over operational and financial policies. (2) Changes in investments in associates and joint ventures for the three-month period ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 Beginning Acquisition (Disposal) Share of net profit (loss) from associates and joint ventures 1 Others Ending KIF Investment Fund ₩ 194,991 - 42 - 195,033 K Bank Inc. 938,217 21,501 10,272 (8,315) 961,675 HD Hyundai Robotics Co., Ltd. 44,951 - (522) 47 44,476 Megazone Cloud Corporation 128,635 - 702 (2,216) 127,121 IGIS No. 468-1 General Private Real Estate Investment Company 23,160 - (4) - 23,156 KT-DSC Creative Economy Youth Start-up Investment Fund 15,580 - (179) - 15,401 IGIS Professional Investors Private Investment Real Estate Investment LLC No 395 7,261 - (727) - 6,534 Others 1 211,151 10,128 (2,645) 121 218,755 Total ₩ 1,563,946 31,629 6,939 (10,363) 1,592,151

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 32 (in millions of Korean won) 2025 Beginning Acquisition (Disposal) Share of net profit (loss) from associates and joint ventures 1 Others Ending KIF Investment Fund ₩ 191,125 - 97 - 191,222 K Bank Inc. 917,641 - 2,347 943 920,931 HD Hyundai Robotics Co., Ltd. 45,830 - (465) 141 45,506 Megazone Cloud Corporation 130,773 - (2,403) 669 129,039 IGIS No. 468-1 General Private Real Estate Investment Company 23,374 - (3) - 23,371 KT-DSC Creative Economy Youth Start-up Investment Fund 15,951 - 1,170 3 17,124 IGIS Professional Investors Private Investment Real Estate Investment LLC No 395 9,727 - (476) - 9,251 Others 1 227,811 8,935 (6,352) 543 230,937 Total ₩ 1,562,232 8,935 (6,085) 2,299 1,567,381 1 KT Investment Co., Ltd., a subsidiary of the Group, recognized net profit (loss) in the investments in associates as operating income. Net loss recognized as operating income for the three-months period ended March 31, 2026 amount to ₩ 48 million (three-month period ended March 31, 2025: net loss of ₩ 156 million).

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 33 (3) Summarized statements of financial position of the major associates and joint ventures as at March 31, 2026 and December 31, 2025 and summarized statements of profit or loss for the three-month period ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) March 31, 2026 Assets Liabilities Operating revenue Profit(loss) for the period KIF Investment Fund ₩ 585,099 - - 127 K Bank Inc. 32,443,446 30,022,321 323,924 33,206 HD Hyundai Robotics Co., Ltd. 494,755 216,025 71,810 (2,930) Megazone Cloud Corporation 1,398,215 782,724 448,458 1,617 IGIS No. 468-1 General Private Real Estate Investment Company 51,876 6 - (8) KT-DSC Creative Economy Youth Start-up Investment Fund 53,892 - 3 (627) IGIS Professional Investors Private Investment Real Estate Investment LLC No 395 215,882 208,260 - (849) (in millions of Korean won) December 31, 2025 March 31, 2025 Assets Liabilities Operating revenue Profit(loss) for the period KIF Investment Fund ₩ 584,972 - - 292 K Bank Inc. 31,862,544 29,692,383 323,501 16,118 HD Hyundai Robotics Co., Ltd. 500,303 216,804 54,460 (4,656) Megazone Cloud Corporation 1,409,372 790,721 477,609 (638) IGIS No. 468-1 General Private Real Estate Investment Company 51,890 11 1 (8) KT-DSC Creative Economy Youth Start-up Investment Fund 54,933 414 2,575 2,430 IGIS Professional Investors Private Investment Real Estate Investment LLC No 395 210,982 202,511 - (112) (4) Due to discontinuance of equity method of accounting, the Group has not recognized loss from associates and joint ventures of ₩ 2,713 million for the three-month period ended March 31, 2026 (three-month period ended March 31, 2025: ₩ 1,628 million). The unrecognized accumulated comprehensive loss of associates and joint ventures as at March 31, 2026, is ₩ 20,109 million (December 31, 2025: ₩ 17,396 million). (5) As at March 31, 2026, the fair value of the investment in K Bank Inc., an associate with a quoted market price, was KRW 756,340 million.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 34 12. Trade and Other Payables (1) Details of trade and other payables as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Current liabilities Trade payables ₩ 1,307,386 1,144,279 Other payables 5,626,181 5,724,428 Total ₩ 6,933,567 6,868,707 Non-current liabilities Trade payables 406 537 Other payables ₩ 295,215 327,732 Total ₩ 295,621 328,269 (2) Details of other payables as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Non-trade payables 1 ₩ 3,302,241 3,435,426 Accrued expenses 1,523,866 1,354,270 Operating deposits 825,627 995,215 Others 269,662 267,249 Less: non-current (295,215) (327,732) Current ₩ 5,626,181 5,724,428 1 As at March 31, 2026, credit sale liabilities amounting to ₩ 1,473,155 million (December 31, 2025: ₩ 1,151,722 million) held by BC Card Co., Ltd. (a subsidiary of the Group) are included.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 35 13. Borrowings (1) Details of borrowings as at March 31, 2026 and December 31, 2025, are as follows: 1) Debentures (in millions of Korean won and foreign currencies in thousands) March 31, 2026 December 31, 2025 Type Maturity Annual interest rates Foreign currency Korean won Foreign currency Korean won MTNP notes 1 Sep. 07, 2034 6.500% USD 100,000 ₩ 151,340 USD 100,000 ₩ 143,490 MTNP notes Jul. 18, 2026 2.500% USD 400,000 605,360 USD 400,000 573,960 MTNP notes Jan. 21, 2027 1.375% USD 300,000 454,020 USD 300,000 430,470 MTNP notes Feb. 02, 2028 4.125% USD 500,000 756,700 USD 500,000 717,450 MTNP notes Mar. 05, 2027 1.217% JPY 23,300,000 220,588 JPY 23,300,000 213,808 MTNP notes Mar. 07, 2028 1.367% JPY 6,700,000 63,431 JPY 6,700,000 61,481 MTNP notes Jan. 03, 2029 4.375% USD 500,000 756,700 USD 500,000 717,450 FR notes 2 Sep. 29, 2028 Compounded SOFR(3M)+0.66 % USD 200,000 302,680 USD 200,000 286,980 The 183-3rd Public bond Dec. 22, 2031 4.270% - 160,000 - 160,000 The 184-3rd Public bond Apr. 10, 2033 3.170% - 100,000 - 100,000 The 186-4th Public bond Jun. 26, 2034 3.695% - 100,000 - 100,000 The 187-4th Public bond Sep. 02, 2034 3.546% - 100,000 - 100,000 The 188-3rd Public bond Jan. 29, 2035 2.706% - 50,000 - 50,000 The 189-3rd Public bond Jan. 28, 2026 - - - - 100,000 The 189-4th Public bond Jan. 28, 2036 2.351% - 70,000 - 70,000 The 190-3rd Public bond Jan. 30, 2028 2.947% - 170,000 - 170,000 The 190-4th Public bond Jan. 30, 2038 2.931% - 70,000 - 70,000 The 191-3rd Public bond Jan. 15, 2029 2.160% - 110,000 - 110,000 The 191-4th Public bond Jan. 14, 2039 2.213% - 90,000 - 90,000 The 192-3rd Public bond Oct. 11, 2029 1.622% - 50,000 - 50,000 The 192-4th Public bond Oct. 11, 2039 1.674% - 110,000 - 110,000 The 193-3rd Public bond Jun. 17, 2030 1.608% - 20,000 - 20,000 The 193-4th Public bond Jun. 15, 2040 1.713% - 60,000 - 60,000 The 194-2nd Public bond Jan. 27, 2026 - - - - 140,000 The 194-3rd Public bond Jan. 27, 2031 1.849% - 50,000 - 50,000 The 194-4th Public bond Jan. 25, 2041 1.976% - 80,000 - 80,000 The 195-2nd Public bond Jun. 10, 2026 1.806% - 80,000 - 80,000 The 195-3rd Public bond Jun. 10, 2031 2.168% - 40,000 - 40,000 The 196-2nd Public bond Jan. 27, 2027 2.637% - 100,000 - 100,000 The 196-3rd Public bond Jan. 27, 2032 2.741% - 30,000 - 30,000 The 197-2nd Public bond Jun. 29, 2027 4.188% - 120,000 - 120,000 The 198-2nd Public bond Jan. 12, 2026 - - - - 150,000 The 198-3rd Public bond Jan. 12, 2028 3.971% - 80,000 - 80,000 The 199-2nd Public bond Jul. 10, 2026 4.146% - 160,000 - 160,000 The 199-3rd Public bond Jul. 12, 2028 4.221% - 155,000 - 155,000 The 200-1st Public bond Feb. 27, 2026 - - - - 120,000 The 200-2nd Public bond Feb. 26, 2027 3.608% - 200,000 - 200,000 The 200-3rd Public bond Feb. 27, 2029 3.548% - 80,000 - 80,000 The 201-1st Public bond Dec. 02, 2027 2.899% - 130,000 - 130,000 The 201-2nd Public bond Dec. 02, 2029 2.918% - 70,000 - 70,000 The 201-3rd Public bond Dec. 02, 2034 3.057% - 100,000 - 100,000 The 202-1st Public bond Nov. 27, 2028 3.052% - 80,000 - 80,000

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 36 (in millions of Korean won and foreign currencies in thousands) March 31, 2026 December 31, 2025 Type Maturity Annual interest rates Foreign currency Korean won Foreign currency Korean won The 202-2nd Public bond Nov. 27, 2030 3.221% - 40,000 - 40,000 The 202-3rd Public bond Nov. 27, 2035 3.460% - 40,000 - 40,000 The 202-4th Public bond Nov. 27, 2045 3.682% - 40,000 - 40,000 The 203-1st Public bond Mar. 04, 2029 3.487% 160,000 - The 203-2nd Public bond Mar. 04, 2031 3.619% 50,000 - The 203-3rd Public bond Mar. 04, 2036 3.910% 50,000 - The 203-4th Public bond Mar. 04, 2046 4.018% 40,000 - The 18-2nd unsecured bond Jul. 02, 2026 2.224% - 50,000 - 50,000 The 19-1st unsecured bond Jun. 12, 2027 3.691% - 50,000 - 50,000 The 19-2nd unsecured bond Jun. 12, 2029 3.783% - 50,000 - 50,000 The 149-2nd Won- denominated unsecured bond Mar. 10, 2026 - - - - 30,000 The 152-2nd Won- denominated unsecured bond Aug. 28, 2026 1.982% - 20,000 - 20,000 The 156-2nd Won- denominated unsecured bond 2 Mar. 25, 2032 10Y CMS+0.965% - 40,000 - 40,000 The 159-2nd Won- denominated unsecured bond Aug. 11, 2027 4.505% - 30,000 - 30,000 The 163-1st Won- denominated unsecured bond Feb. 20, 2026 - - - - 20,000 The 163-2nd Won- denominated unsecured bond Feb. 22, 2028 4.311% - 80,000 - 80,000 The 164-3rd Won- denominated unsecured bond Apr. 14, 2028 4.220% - 30,000 - 30,000 The 165-2nd Won- denominated unsecured bond Nov. 09, 2026 3.932% - 10,000 - 10,000 The 165-3rd Won- denominated unsecured bond May. 07, 2027 3.972% - 30,000 - 30,000 The 170th Won-denominated unsecured bond Jun. 12, 2026 3.688% - 50,000 - 50,000 The 171-1st Won- denominated unsecured bond Jun. 11, 2027 3.330% - 20,000 - 20,000 The 171-2nd Won- denominated unsecured bond Aug. 12, 2027 3.329% - 60,000 - 60,000 The 172-1st Won- denominated unsecured bond Mar. 06, 2026 - - - - 10,000 The 172-2nd Won- denominated unsecured bond Mar. 09, 2026 - - - - 40,000 The 172-3rd Won- denominated unsecured bond Sep. 09, 2026 3.474% - 30,000 - 30,000

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 37 (in millions of Korean won and foreign currencies in thousands) March 31, 2026 December 31, 2025 Type Maturity Annual interest rates Foreign currency Korean won Foreign currency Korean won The 173-1st Won- denominated unsecured bond Sep. 23, 2027 3.291% - 60,000 - 60,000 The 173-2nd Won- denominated unsecured bond Sep. 24, 2027 3.291% - 50,000 - 50,000 The 173-3rd Won- denominated unsecured bond Oct. 22, 2027 3.292% - 40,000 - 40,000 The 175-2nd Won- denominated unsecured bond Dec. 10, 2027 3.101% - 50,000 - 50,000 The 176th Won-denominated unsecured bond Dec. 18, 2026 3.134% - 70,000 - 70,000 The 177-1st Won- denominated unsecured bond Jul. 09, 2027 3.097% - 70,000 - 70,000 The 177-2nd Won- denominated unsecured bond Jul. 12, 2027 3.097% - 70,000 - 70,000 The 177-3rd Won- denominated unsecured bond Jan. 09, 2029 3.115% - 30,000 - 30,000 The 177-4th Won- denominated unsecured bond Jan. 09, 2030 3.140% - 40,000 - 40,000 The 178-1st Won- denominated unsecured bond Feb. 28, 2029 3.026% - 50,000 - 50,000 The 178-2nd Won- denominated unsecured bond Feb. 28, 2030 3.087% - 30,000 - 30,000 The 179-1st Won- denominated unsecured bond Sep. 23, 2027 3.013% - 10,000 - 10,000 The 179-2nd Won- denominated unsecured bond Sep. 24, 2027 3.013% - 40,000 - 40,000 The 179-3rd Won- denominated unsecured bond Mar. 24, 2028 3.038% - 50,000 - 50,000 The 179-4th Won- denominated unsecured bond Mar. 25, 2030 3.126% - 20,000 - 20,000 The 179-5th Won- denominated unsecured bond Sep. 25, 2030 3.178% - 20,000 - 20,000 The 180-1st Won- denominated unsecured bond Apr. 03, 2028 2.989% - 90,000 - 90,000 The 180-2nd Won- denominated unsecured bond Apr. 04, 2028 2.989% - 70,000 - 70,000

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 38 (in millions of Korean won and foreign currencies in thousands) March 31, 2026 December 31, 2025 Type Maturity Annual interest rates Foreign currency Korean won Foreign currency Korean won The 180-3rd Won- denominated unsecured bond Apr. 04, 2029 3.026% - 40,000 - 40,000 The 181-1st Won- denominated unsecured bond Nov. 22, 2027 2.730% - 80,000 - 80,000 The 181-2nd Won- denominated unsecured bond May. 22, 2028 2.781% - 100,000 - 100,000 The 181-3rd Won- denominated unsecured bond May. 22, 2029 2.851% - 40,000 - 40,000 The 182-1st Won- denominated unsecured bond Feb. 11, 2028 2.776% - 30,000 - 30,000 The 182-2nd Won- denominated unsecured bond Jun. 13, 2028 2.822% - 70,000 - 70,000 The 183th Won-denominated unsecured bond Aug. 22, 2028 2.798% - 80,000 - 80,000 The 184-1st Won- denominated unsecured bond Oct. 20, 2028 2.800% - 80,000 - 80,000 The 184-2nd Won- denominated unsecured bond Oct. 19, 2029 2.894% - 20,000 - 20,000 The 185th Won-denominated unsecured bond Dec. 10, 2027 3.291% - 80,000 80,000 The 186-1st Won- denominated unsecured bond Feb. 19, 2027 2.952% - 60,000 - - The 186-2nd Won- denominated unsecured bond Mar. 19, 2027 2.962% - 30,000 - - The 187-1st Won- denominated unsecured bond Feb. 23, 2027 3.129% - 60,000 - - The 187-2nd Won- denominated unsecured bond Feb. 24, 2027 3.129% - 30,000 - - The 187-3rd Won- denominated unsecured bond Aug. 23, 2027 3.286% - 10,000 - - The 187-4th Won- denominated unsecured bond Feb. 23, 2028 3.521% - 10,000 - - The 188-1st Won- denominated unsecured bond Mar. 06, 2028 3.552% - 60,000 - - The 188-2nd Won- denominated unsecured bond Mar. 06, 2029 3.765% - 20,000 - -

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 39 (in millions of Korean won and foreign currencies in thousands) March 31, 2026 December 31, 2025 Type Maturity Annual interest rates Foreign currency Korean won Foreign currency Korean won The 188-3rd Won- denominated unsecured bond Mar. 07, 2029 3.765% - 20,000 - - Subtotal 8,875,819 8,720,089 Less: Current portion (2,227,645) (1,653,217) Discount on bonds (22,899) (23,314) Total ₩ 6,625,275 ₩ 7,043,558 1 As at March 31, 2026, the Controlling Company has outstanding notes in the amount of USD 100 million with fixed interest rates under Medium Term Note Program (“MTNP”) registered on the Singapore Stock Exchange, which allowed issuance of notes of up to USD 2,000 million. However, the MTNP was terminated in 2007. 2 The interest rates for Daily SOFR and CMS (10Y) are approximately 3.680% and 3.785%, respectively, as at March 31, 2026.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 40 2) Borrowings a. Short-term borrowings (in millions of Korean won) March 31, 2026 December 31, 2025 Type Financial institution Annual interest rates Foreign currency Korean won Foreign currency Korean won Operational Shinhan Bank 1 4.800%~5.120% - ₩ 9,490 - ₩ 9,290 Term SOFR(3M)+1.150% USD 25,000 37,835 USD 35,000 50,222 3.350% - 70,000 - 70,000 Korea Development Bank 4.050% - 15,000 - - - - - - 24,600 Industrial Bank of Korea 4.269% - 6,000 - 6,000 Hana Bank 1 FB(6M)+1.988% - 5,000 - 5,000 KB SECURITIES 2.730%~3.390% - 90,000 - 90,000 NongHyup Bank 1 MOR(6M)+1.770% 1,000 1,000 Korea Investment & Securities 3.260% - 80,000 - 70,000 Kiwoom Securities Co., Ltd. - - - - 10,000 Shinhan Securities Co., Ltd. 2.880% - 99,936 - 198,855 Daol Securities Co., Ltd 2.600% - 99,288 - 98,637 BIVD 6.400% VND 3,768,081 216 VND 3,768,081 206 Woori Investment Securities Co., Ltd. 2.730% - 30,000 - 30,000 BoA1 Term SOFR(3M)+0.821% USD 2,000 3,027 - - BCA 8.500% IDR 944,171 84 - - PF loans Korea Investment Capital - - - - 45,999 Total ₩ 546,876 ₩ 709,809 1 As at March 31, 2026, the interest rates for Term SOFR (3M), Financial Bond (6M), and MOR (6M) are approximately 3.682%, 2.928%, and 2.920%, respectively.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 41 b. Long-term borrowings (in millions of Korean won and thousands of foreign currencies) March 31, 2026 December 31, 2025 Financial institution Type Annual interest rates Foreign currency Korean won Foreign currency Korean won Export-Import Bank of Korea Inter-Korean Cooperation Fund 1 1.000% - ₩ 247 - ₩ 493 CA-CIB General loans 3.020%~3.820% - 200,000 - 200,000 DBS General loans 2.980%~3.820% - 200,000 - 200,000 Shinhan Bank General loans 3.390% - 50,000 - 100,000 Structured loans 3.390% - 50,000 - General loans 2 Term SOFR(3M)+1.300% USD 21,127 31,973 USD 21,127 30,315 General loans 2 Term SOFR(3M)+1.600% USD 8,640 13,076 USD 8,640 12,398 General loans - - - - 16,900 Woori Bank PF loans 2 CD(91D)+1.750% - 25,526 - 25,526 General loans CD(91D)+1.400% - 18,000 - 18,000 Hi Investment & Securities CP 2.302% - 98,311 - 97,706 Korea Development Bank General loans 3.770% - 33,000 - 33,000 General loans 4.310% - 10,000 - 10,000 KDB Bank Uzbekistan Secured loans 3 23.00% UZS 29,762,533 3,572 UZS 29,762,533 3,572 Secured loans 3 10.30% USD 5,400 7,977 USD 5,400 7,857 Standard Chartered Bank Korea PF loans 3.900% - 65,000 - 65,000 Kookmin Bank General loans 4.750% - 8,000 - 8,000 General loans 2 CD(91D)+1.480% - 20,000 - 20,000 NongHyup Bank PF loans 3.900% - 70,000 - 70,000 Industrial Bank of Korea PF loans 3.900% - 65,000 - 65,000 Kyongnam Bank and others General loans 4.300% - 48,392 - 31,383 Hana Bank and others PF loans 4.700% - 364,711 - 363,838 KOREA INVESTMENT CAPITAL CO., LTD and others PF loans 8.000% - 44,000 - - DH Auto 1st Co.,Ltd. PF loans 10.000% - 10,000 - - Subtotal - 1,436,785 - 1,378,988 Less: Current portion (757,243) (136,513) Total 679,542 1,242,475 1 The above Inter-Korean Cooperation Fund is repayable in installments over 13 years after a 7-year grace period. 2 As at March 31, 2026, the interest rates for TERM SOFR (3M) and CD (91D) are approximately 3.682% and 2.820%, respectively. 3 The general loans are repayable in installments over 3 years after a two-year grace period.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 42 (2) Repayment schedule of the Group’s debentures and borrowings including the portion of current liabilities as at March 31, 2026, is as follows: (in millions of Korean won) Debentures Borrowings Total In local currency In foreign currency Sub- total In local currency In foreign currency Sub- total Apr.1, 2026 ~ Mar. 31, 2027 ₩ 950,000 1,279,968 2,229,968 1,230,983 73,135 1,304,118 3,534,086 Apr.1, 2027 ~ Mar. 31, 2028 1,480,000 820,131 2,300,131 596,392 13,075 609,467 2,909,598 Apr.1, 2028 ~ Mar. 31, 2029 1,225,000 1,059,380 2,284,380 33,000 3,850 36,850 2,321,230 Apr.1, 2029 ~ Mar. 31, 2030 360,000 - 360,000 - 3,850 3,850 363,850 After Apr.1, 2030 1,550,000 151,340 1,701,340 25,526 3,850 29,376 1,730,716 Total ₩ 5,565,000 3,310,819 8,875,819 1,885,901 97,760 1,983,661 10,859,480 14. Provisions Changes in provisions for the three-month period ended March 31, 2026 and 2025, are as follows: 2026 (in millions of Korean won) Litigation Restoration cost Others Total Beginning balance ₩ 22,539 131,821 263,525 417,885 Transfer and reclassification - (1,310) 189 (1,121) Usage - (218) (17,591) (17,809) Reversal - (424) (34) (458) Others - (213) 138 (75) Ending balance ₩ 22,539 129,656 246,227 398,422 Less: Current ₩ (21,311) (27,679) (245,948) (294,938) Non-current 1,228 101,977 279 103,484 2025 (in millions of Korean won) Litigation Restoration cost Others Total Beginning balance ₩ 21,690 141,761 60,956 224,407 Transfer and reclassification 27 1,607 8,949 10,583 Usage (27) (758) (7,673) (8,458) Reversal - (157) (265) (422) Others - 11 - 11 Ending balance ₩ 21,690 142,464 61,967 226,121 Less: Current ₩ (21,690) (32,591) (60,165) (114,446) Non-current - 109,873 1,802 111,675

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 43 15. Net Defined Benefit Liabilities (Assets) (1) The amounts recognized in the statements of financial position as at March 31, 2026 and December 31, 2025, are determined as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Present value of defined benefit obligations ₩ 2,314,988 2,306,248 Fair value of plan assets (2,251,472) (2,292,457) Liabilities ₩ 113,746 85,631 Assets ₩ 50,230 71,840 (2) Changes in the defined benefit obligations for the three-month period ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Beginning ₩ 2,306,248 2,232,898 Current service cost 58,750 57,056 Interest expense 18,485 16,408 Benefit paid (66,616) (27,072) Remeasurements on defined benefit obligations: (536) 11,186 Changes in scope of consolidation - (4,636) Others (1,343) 2,365 Ending ₩ 2,314,988 2,288,205 (3) Changes in the fair value of plan assets for the three-month period ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Beginning ₩ 2,292,457 2,153,792 Interest income 19,471 16,794 Remeasurements on plan assets: (3,149) 596 Employer contributions 1,009 1,311 Benefits paid (56,253) (29,672) Changes in scope of consolidation - (5,588) Others (2,063) (542) Ending ₩ 2,251,472 2,136,691

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 44 (4) Amounts recognized in the consolidated statement of profit or loss for the three-month period ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Current service cost ₩ 58,750 57,056 Net interest income (986) (386) Transfer out (3,136) (3,383) Total expenses ₩ 54,628 53,287 16. Commitments and Contingencies (1) As at March 31, 2026, major commitments with local financial institutions are as follows: (in millions of Korean won and foreign currencies in thousands) Financial institution Limit Used amount Bank overdraft Kookmin Bank and others ₩ 374,000 - Inter-Korean Cooperation Fund Export-Import Bank of Korea 37,700 247 Economic Cooperation Business Insurance Export-Import Bank of Korea 3,240 1,732 Collateralized loan on electronic accounts receivable-trade Kookmin Bank and others 1,051,650 84,168 Plus electronic notes payable Industrial Bank of Korea 50,000 - Working capital loan Korea Development Bank and others 1,411,091 217,490 Shinhan Bank USD 54,767 USD 54,767 Facility loans Shinhan Bank and others 787,900 727,426 Derivatives transaction limit Korea Development Bank and others USD 1,920,000 USD 1,920,000 Shinhan Bank and others JPY 30,000,000 JPY 30,000,000 Total KRW 3,715,581 1,031,063 USD 1,974,767 1,974,767 JPY 30,000,000 30,000,000

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 45 (2) As at March 31, 2026, guarantees received from financial institutions and others are as follows: (in millions of Korean won and foreign currencies in thousands) Financial institution Limit Hana Bank Guarantee for payment in Korean currency 4,000 Comprehensive credit line and others 2,900 Comprehensive credit line and others USD 10,300 Kookmin Bank Guarantee for payment in foreign currency USD 3,186 Shinhan Bank Guarantee for payment in Korean currency 55,764 Guarantee for payment in foreign currency USD 98,067 Corporate card issuance guarantee VND 231,830 Woori Bank Guarantee for payment in Korean currency 100 Guarantee for payment in foreign currency USD 5,000 Performance guarantee and others USD 282 HSBC Guarantees for depositions USD 1,510 Seoul Guarantee Insurance Company Performance guarantee and others 477,008 Korea Software Financial Cooperative Performance guarantee and others 1,688,131 Korea Housing Finance Corporation Performance guarantee and others 135 Korea Housing & Urban Guarantee Corporation1 Performance guarantee and others 25,526 Information & Communication Financial Cooperative Performance guarantee and others 838,568 ACE American Fire and Marine Insurance Co. Performance guarantee and others USD 10,000 Total KRW 3,092,132 USD 128,345 VND 231,830

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 46 (3) The Controlling Company is jointly and severally obligated with KT Sat Co., Ltd., a subsidiary, to pay KT Sat Co., Ltd.’s liabilities incurred prior to spin-off. As at March 31, 2026, the Controlling Company and KT Sat Co., Ltd. are jointly and severally liable for reimbursement of ₩ 428 million(as at December 31, 2025: ₩ 428 million). (4) For the three-month period ended March 31, 2026, the Group entered into agreements with the Securitization Specialty Companies (2026: First 5G 85th Securitization Specialty Co., Ltd., 2025: First 5G 79th to 84th Securitization Specialty Co., Ltd.) and disposed of its trade receivables related to handset sales. The Group also made asset management agreements with each securitization specialty company and in accordance with the agreement, the Group will receive asset management fees upon liquidation of the securitization specialty company. (5) As at March 31, 2026, the Group is a defendant in 217 lawsuits with a total claimed amount of ₩ 171,525 million (as at December 31, 2025: ₩ 158,621 million). As at March 31, 2026, litigation provisions of ₩ 22,539 million for pending lawsuits and unasserted claims are recorded as liabilities for potential loss in the ordinary course of business. The final outcomes of the cases cannot be estimated as at March 31, 2026 (Note 14). (6) Under the agreement of bond issuance and borrowings, the Group is required to maintain certain financial ratios such as debt-to-equity ratio, use the funds for the designated purpose and report to the creditors periodically. The covenant also contains restriction on provision of additional collateral and disposal of certain assets. (7) As at March 31, 2026, the Group participates in Algerie Sidi Abdela new town development consortium (percentage of ownership: 2.5%) and has joint liability with other consortium participants.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 47 (8) As at March 31, 2026, the agreement amount for the acquisition of property and equipment, intangible assets, and investment properties that are not yet recognized amounts to ₩ 586,358 million (as at December 31, 2025: ₩ 399,817 million). (9) The Group entered into an agreement with financial investors of Epsilon Global Communications PTE. Ltd. regarding the acquisition of shares contract. If certain conditions are not met in the future as disclosed in the terms and conditions of the agreement, financial investors may exercise Tag-Along Right and Drag-Along Right for the convertible preferred shares they hold (Note 6). (10) The Group has an obligation for additional contributions as per agreement to Storm Ventures FUND VII and others. As at March 31, 2026, remaining amounts of USD 25,450 thousand and JPY 160,000 thousand will be invested through the Capital Call method in the future. (11) As at March 31, 2026, the Group has an obligation of ₩ 470,160 million (100%) to provide financial support as an operating investor to K Defense Co., Ltd. established in accordance with the Private Investment Act on Social Infrastructure. (12) The Group has an agreement related to a stock sale contract with HYUNDAI MOBIS Co., Ltd., and HYUNDAI MOTOR COMPANY. If the Company intends to dispose of the acquired stocks to a third party after a certain period has elapsed from the date of the contract and the acquired stocks are to be disposed to a third party, HYUNDAI MOBIS Co., Ltd., and HYUND AI MOTOR COMPANY may exercise a preferential purchase right to designate a buyer with priority. (13) The Group entered into an agreement with equity investors who participated in the equity acquisition contract of kt Cloud Co., Ltd. According to this agreement, if conditions per the agreement are met, the financial investor may exercise a Tag-Along or a Put-Option to the Group in the future. In relation to this contract, the Group and the financial investor may settle mutual profits if there is a difference between the final public offering price and the preliminary public offering price (Note 6). (14) As at March 31, 2026, The Group has the obligation to pay minimum guarantees for utilizing product bundling of Tving Co., Ltd., and the right to be paid a certain proportion of the excess as per agreement. (15) As at March 31, 2026, the Group exercised a put option on all of its shares in KT Rwanda Networks Ltd. pursuant to the shareholders’ agreement with the Rwandan government. Following an objection raised by the Rwandan government on the exercise of the put option, an international arbitration proceeding is ongoing at an international arbitration institution located in Mauritius, and the outcome of the arbitration remains uncertain.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 48 (16) Details of property and equipment and investment properties provided as collateral as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 Collateral Carrying amount Secured amount Related account Related amount Mortgagee Land and buildings(*) ₩ 1,293,903 806,422 Borrowings 641,708 Industrial Bank of Korea/Shinhan Bank/Hana Bank and others Land and buildings 1,316,666 120,279 Deposits received 103,112 Leaseholders (in millions of Korean won) December 31, 2025 Collateral Carrying amount Secured amount Related account Related amount Mortgagee Land and buildings(*) ₩ 1,300,290 810,057 Borrowings 647,638 Industrial Bank of Korea/Shinhan Bank/Hana Bank and others Land and buildings 1,290,020 110,273 Deposits received 91,806 Leaseholders (*) The carrying amount of the real estate entrusted under the real estate collateral trust agreement entered into with Kyobo Real Estate Trust is included. In addition, the priority beneficiary rights, insurance claim rights, and pledge over the deposits in the loan disbursement account under the trust agreement have been provided as collateral for the borrowings to the financial institution

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 49 (17) The Group has established supplier finance agreements with some suppliers, and suppliers participating in the supplier finance agreement can receive early payment on invoices sent to the Group from the Group’s external finance provider. The Group pays the finance provider in accordance with the usual payment terms to settle the debt. As at March 31, 2026, all financial liabilities subject to the supplier finance agreement are included in trade and other payables, and the carrying amount is ₩ 65,239 million (as at December 31, 2025: ₩ 46,011 million). Of these, the carrying amount of the part that the suppliers have already received from the finance provider is ₩ 43,140 million (as at December 31, 2025: ₩ 19,196 million). There were no significant non-cash changes in the carrying amount of the trade and other payables included in the Group’s supplier finance agreement. (18) During the prior period, the Group became aware of damages caused by unauthorized small-value payments and security incidents, and is currently under investigation by the Personal Information Protection Commission regarding the timing and circumstances of these incidents. As the investigation is ongoing, the Group cannot reasonably estimate any obligations that may arise in connection with this matter.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 50 17. Leases Information for leases when the Group acts as a lessee is as follows. Information on leases when the Group acts as a lessor is described in Note 10. (1) Amounts recognized in the consolidated statement of financial position The consolidated statements of financial position shows the following amounts relating to leases: (in millions of Korean won) March 31, 2026 December 31, 2025 Right-of-use assets Property and buildings ₩ 1,278,486 1,307,484 Machinery and communication line facilities 120,530 125,715 Others 93,055 104,918 Total ₩ 1,492,071 1,538,117 (in millions of Korean won) March 31, 2026 December 31, 2025 Lease liabilities1 Current ₩ 377,848 379,291 Non-current 1,015,853 1,043,915 Total ₩ 1,393,701 1,423,206 1 Included in the line item other current liabilities and other non-current liabilities in the consolidated statements of financial position (Note 8). For the three-month periods ended March 31, 2026 and 2025, right-of-use assets related to leases increased by ₩ 65,693 million and ₩ 105,804 million, respectively.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 51 (2) Amounts recognized in the consolidated statement of profit or loss The consolidated statement of profit or loss relating to leases for the three-month period ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Depreciation of right-of-use assets Property and buildings ₩ 83,639 78,822 Machinery and communication line facilities 15,248 6,337 Others 15,926 19,338 Total ₩ 114,813 104,497 Interest expense relating to lease liabilities ₩ 13,411 9,701 Expense relating to short-term leases 2,262 3,493 Expense relating to leases of low-value assets that are not short-term leases 6,352 6,132 Expense relating to variable lease payments not included in lease liabilities 3,497 3,346 The total cash outflow for leases for the three-month periods ended March 31, 2026 and 2025, is ₩ 125,013 million and ₩ 118,636 million, respectively. 18. Retained Earnings Details of retained earnings as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Legal reserve 1 ₩ 782,249 782,249 Voluntary reserves 2 4,651,362 4,651,362 Unappropriated retained earnings 9,740,886 9,530,721 Total ₩ 15,174,497 14,964,332 1The Commercial Code of the Republic of Korea requires the Controlling Company to appropriate, as a legal reserve, an amount equal to a minimum of 10% of cash dividends paid until such reserve equals 50% of its issued share capital. The reserve is not available for the payment of cash dividends but may be transferred to share capital with the approval of the Controlling Company’s Board of Directors or used to reduce accumulated deficit, if any, with the ratification of the Controlling Company’s majority shareholders. 2 The reserves of research and development of human resources in other surplus reserves are separately accumulated on disposal of retained earnings on tax filing adjustments when calculating income taxes in accordance with regulations of Tax Reduction and Exemption Control Act of Korea. Reversal of the reserves according to the relevant tax law can be paid out as dividends.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 52 19. Other Components of Equity (1) The Group’s other components of equity, as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Treasury stock ₩ (461,077) (461,135) Gain on disposal of treasury stock 2,924 2,828 Share-based compensation 9,899 7,119 Equity transactions within consolidated entities 1 (425,402) (425,527) Total ₩ (873,656) (876,715) 1 Profit or loss incurred from transactions with non-controlling interest and investment difference incurred from change in proportion of subsidiaries are included. (2) As at March 31, 2026 and December 31, 2025, the details of treasury stock, are as follows: March 31, 2026 December 31, 2025 Number of shares (in shares) 10,925,239 10,926,622 Amount (in millions of Korean won) ₩ 461,077 461,135 Treasury stock held as at March 31, 2026, is expected to be used for stock compensation for the Group’s directors, employees, and for other purposes. 20. Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities (1) The Group has recognized the following amounts as revenue for the three-month periods ended March 31, 2026 and 2025: (in millions of Korean won) 2026 2025 Revenue from contracts with customers ₩ 6,698,520 6,785,075 Revenue from other sources 79,928 60,042 Total ₩ 6,778,448 6,845,117

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 53 (2) Operating revenues for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Services provided ₩ 5,733,426 5,700,395 Sales of goods 1,045,022 1,144,722 Total ₩ 6,778,448 6,845,117 Revenue from providing services is recognized over time and revenue from sales of goods is recognized at a point in time. Revenues from construction commitments included in sales of goods are recognized using the percentage of completion method. (3) The contract assets, liabilities and deferred revenue recognized in relation to the revenues from contracts with customers are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Contract assets 1 ₩ 1,205,325 1,111,973 Contract liabilities 1 258,413 267,622 Deferred revenue 2 94,568 94,302 1 The Group recognized contract assets of ₩ 147,752 million and contract liabilities of ₩ 19,228 million for long-term construction contracts as at March 31, 2026 (December 31, 2025: contract assets of ₩ 85,713 million and contract liabilities of ₩ 27,884 million). The Group recognizes contract assets as trade receivables and other receivables, and contract liabilities as other current liabilities. 2 Deferred revenue related to government grant is excluded. (4) The contract costs recognized as assets are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Incremental costs of obtaining a contract ₩ 2,042,976 2,018,168 Cost of contract performance 81,886 80,920 Total ₩ 2,124,862 2,099,088 As at March 31, 2026, the Group recognized ₩ 498,255 million (three-month period ended March 31, 2025: ₩ 431,336 million) of operating expenses related to contract cost assets.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 54 (5) For the three-month periods ended March 31, 2026 and 2025, revenue recognized from contract liabilities and deferred revenue carried-forward from prior year, is as follows: (in millions of Korean won) 2026 2025 Revenue recognized from the beginning balance of contract liabilities Allocation of the transaction price ₩ 82,731 63,915 Deferred revenue of joining/installment fees 13,435 12,485 Total ₩ 96,166 76,400 21. Operating Expenses (1) Operating expenses for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Employee benefit cost ₩ 1,173,874 1,121,835 Depreciation 694,186 715,828 Depreciation of right-of-use assets 114,813 104,497 Amortization of intangible assets 148,336 148,351 Commissions 354,254 394,628 Interconnection charges 96,481 97,365 International interconnection fees 40,065 30,940 Purchase of inventories 1,157,815 833,388 Changes of inventories (121,414) 86,324 Sales promotion expense and sales commissions 630,594 568,686 Service cost 609,403 600,399 Utilities 139,556 136,783 Taxes and dues 65,284 64,441 Rent 37,095 39,123 Insurance premium 15,956 17,150 Installation fee 38,207 45,839 Advertising expenses 32,265 32,250 Research and development expenses 64,544 61,413 Card service costs 651,325 672,645 Others 353,108 384,461 Total ₩ 6,295,747 6,156,346

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 55 (2) Details of employee benefits for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Short-term salaries and wages ₩ 1,078,175 1,036,195 Post-employment benefits (defined benefit plan) 54,628 53,287 Post-employment benefits (defined contribution plan) 22,775 20,722 Share-based payment 3,911 2,340 Others 14,385 9,291 Total ₩ 1,173,874 1,121,835 22. Other Income and Other Expenses (1) Other income for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Gain on disposal of property and equipment and investment properties ₩ 17,205 9,832 Gain on disposal of intangible assets - 1,641 Gain on disposal of right-of-use assets 233 939 Compensation on impairment of property and equipment 47,702 17,566 Income from government subsidies 433 45 Gain on disposal of investments in associates 21,501 7,481 Gain on disposal of subsidiaries - 10,156 Others 9,290 17,702 Total ₩ 96,364 65,362 (2) Other expenses for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Loss on disposal of propert and equipment ₩ 28,169 14,548 Loss on disposal of intangible assets 696 1,868 Loss on disposal of right-of-use assets 232 907 Loss on disposal of subsidiaries - 403 Donations 7,557 3,731 Other allowance for bad debts 4,903 4,452 Others 16,143 11,901 Total ₩ 57,700 37,810

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 56 23. Financial Income and Costs (1) Details of finance income for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Interest income ₩ 62,647 66,266 Gain on foreign currency transactions 4,982 4,894 Gain on foreign currency translation 7,415 11,040 Gain on derivatives transactions 1,403 76 Gain on valuation of derivatives 163,235 16,495 Dividend income 24,048 28,803 Others 1,589 520 Total ₩ 265,319 128,094 (2) Details of finance costs for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Interest expenses ₩ 94,195 93,083 Loss on foreign currency transactions 5,268 2,502 Loss on foreign currency translation 174,645 12,447 Loss on derivatives transactions - 4,742 Loss on valuation of derivatives 4,621 8,561 Loss on disposal of trade receivables 2,952 1,015 Loss on valuation of financial instruments - 138 Others (643) 1,871 Total ₩ 281,038 124,359 24. Income Tax Expense Income tax expense is recognized based on the best estimate of the weighted average annual income tax rate expected for the full financial year. The estimated average annual income tax rate used for the year ending December 31, 2026, is 24.2%

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 57 25. Earnings per Share Basic earnings per share for the three-month periods ended March 31, 2026 and 2025, are calculated as follows: (1) Basic Earnings per Share Basic earnings per share is calculated by dividing the profit for the period by the weighted average number of ordinary shares outstanding during the period, excluding ordinary shares held by the Group as treasury stock. 2026 2025 Profit attributable to ordinary shares of owners of the Controlling Company (in millions of Korean won) ₩ 351,963 539,569 Weighted average number of ordinary shares outstanding (in number of shares) 241,095,985 245,753,391 Basic earnings per share (in Korean won) ₩ 1,460 2,196 (2) Diluted Earnings per Share Diluted earnings per share from operations is calculated by adjusting the weighted average number of ordinary shares outstanding assuming that all dilutive potential ordinary shares are converted into ordinary shares. The Group has dilutive potential ordinary shares from convertible bonds, convertible preferred stock and other share-based payments: 2026 2025 Profit attributable to ordinary shares (in millions of Korean won) ₩ 351,963 539,569 Adjusted net income attributable to ordinary shares (in millions of Korean won) (153) (257) Diluted profit attributable to ordinary shares (in millions of Korean won) ₩ 351,810 539,312 Number of dilutive potential ordinary shares Outstanding 1 (in number of shares) 121,294 101,557 Weighted average number of ordinary shares outstanding (in number of shares) 241,217,279 245,854,948 Diluted earnings per share (in Korean won) ₩ 1,458 2,194 1 The dilutive potential common shares consist of share-based compensation. Diluted earnings per share represents quarterly net income attributable to each ordinary share and dilutive potential ordinary share. Diluted earnings per share is calculated by dividing adjusted profit for the year by the sum of the number of ordinary shares and dilutive potential ordinary shares.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 58 26. Cash Generated from Operations (1) Cash flows from operating activities for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 1. Profit for the period ₩ 388,321 566,799 2. Adjustments for: Income tax expense 124,216 145,031 Interest income 1 (96,450) (93,923) Interest expense 1 113,337 109,686 Dividends income 2 (25,429) (29,046) Depreciation 708,412 728,017 Amortization of intangible assets 150,488 150,238 Depreciation of right-of-use assets 114,813 104,497 Post-employment benefits (defined benefits) 57,764 56,670 Impairment losses on trade receivables 26,913 33,667 Share of net profit or loss of associates and joint ventures (6,939) 8,384 Gain on disposal of subsidiaries and associates (21,501) (17,234) Loss on disposal of property, equipment and investment properties 10,964 4,716 Impairment loss on property and equipment 15 - Gain on disposal of right-of-use assets (1) (32) Loss on disposal of intangible assets 696 227 Reversal of impairment loss on intangible assets (20) - Loss on foreign currency translation 166,939 1,423 Gain on valuation and settlement of derivatives (158,620) (4,294) Loss on disposal of financial assets at amortized cost - 18 Loss(gain) on disposal of financial assets at fair value through profit or loss (1,071) 1,835 Loss(gain)on valuation of financial assets at fair value through profit or loss 3 (1,061) 1,293 Others 62,785 9,784 3. Changes in operating assets and liabilities Increase in trade receivables (186,017) (350,836) Increase in other receivables (243,154) (297,319) Increase in other current assets (167,416) (316,140) Decrease (increase) in other non-current assets (132,341) 31,614 Decrease (increase) in inventories (107,218) 141,528 Increase (decrease) in trade payables 168,839 (241,380) Increase (decrease) in other payables (30,686) 167,629 Decrease in other current liabilities (85,304) (174,918) Increase in other non-current liabilities 4,247 4,390 Increase (decrease) in provisions (17,018) 1,612 Increase in deferred revenue 76 29 Decrease in plan assets 78,648 204,802 Payment of post-employment benefits (defined benefit) (99,275) (220,400) 4. Cash generated from operations (1+2+3) ₩ 797,952 728,367 1 Subsidiaries such as BC Card Co., Ltd. recognize interest income and expense as operating revenue and expense, respectively. Interest income of ₩ 33,803 million (for the three-month period ended March 31, 2025: ₩ 27,657 million) recognized as operating revenue and interest expense of ₩ 19,142 million (for the three-month period ended March 31, 2025: ₩ 16,603 million) recognized as operating expense, for the three-month period ended March 31, 2026, are included in the adjustment.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 59 2 BC Card Co., Ltd. recognized dividend income as operating revenue. Dividend income of ₩ 1,373 million that is recognized as operating revenue for the three-month period ended March 31, 2026 (three-month period ended March 31, 2025: ₩ 228 million) is included in the adjustment. 3 Subsidiaries such as KT Investment Co., Ltd. recognized gain and loss on valuation of financial assets at fair value through profit or loss as operating revenue and expense, respectively. Net loss on valuation of financial assets at fair value through profit or loss of ₩ 541 million (for the three-month period ended March 31, 2025: net loss on valuation of financial assets at fair value through profit or loss of ₩ 1,401 million that is recognized as operating revenue and expense, for the three-month period ended March 31, 2026, is included in the adjustment. (2) Significant transactions not affecting cash flows for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Reclassification of current portion of borrowings ₩ 994,534 613,630 Reclassification of construction-in-progress to property and equipment 409,044 665,171 Change of other payables relating to acquisition of property and equipment (175,277) (416,484) Change of other payables relating to acquisition of intangible assets (277,760) (274,591) Reclassification of other payables from net defined benefit liabilities (9,420) (17,587) Increase in dividend payable 167,579 141,408

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 60 27. Changes in Liabilities Arising from Financing Activities Details of changes in liabilities arising from financing activities, liabilities related to cashflow to be classified as future financing activities, for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 Others Beginning Cash flows Acquisition Changes in FX rate Fair value change Other changes Ending Borrowings ₩ 10,785,572 (29,075) - 168,236 - (88,152) 10,836,581 Lease liabilities 1,423,206 (100,649) 65,682 - 602 4,860 1,393,701 Derivative liabilities 13,862 - - - (10,216) - 3,646 Derivative assets (315,537) - - - (164,511) - (480,048) Total ₩ 11,907,103 (129,724) 65,682 168,236 (174,125) (83,292) 11,753,880 (in millions of Korean won) 2025 Others Beginning Cash flows Acquisition Changes in FX rate Fair value change Other changes Ending Borrowings ₩ 10,520,691 646,953 22,990 (4,468) - (16,621) 11,169,545 Lease liabilities 1,059,453 (97,790) 138,670 - 20 (41,567) 1,058,786 Derivative liabilities 3 - - - 11 - 14 Derivative assets (445,471) (3,724) - - (19,444) 4,427 (464,212) Total ₩ 11,134,676 545,439 161,660 (4,468) (19,413) (53,761) 11,764,133

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 61 28. Segment Information (1) The management of the Group determines the operating segments based on the reported information when establishing the business strategy. Details Business service ICT Mobile/fixed line telecommunication service and convergence business, B2B business and others Finance Credit card business Satellite TV Satellite TV business Real estate Residential building development and supply Others IT, facility security, global business, and others (2) Details of each segment for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 Operating revenues Operating income Depreciation and amortization 1 ICT ₩ 4,834,631 313,928 796,693 Finance 795,476 47,844 6,897 Satellite TV 173,269 7,236 10,865 Real estate 231,193 51,655 18,625 Others 2,211,731 79,378 159,603 Subtotal 8,246,300 500,041 992,683 Elimination (1,467,852) (17,340) (35,348) Consolidated amount ₩ 6,778,448 482,701 957,335 1 Sum of the depreciation and amortization of property and equipment, intangible assets, investment properties and right-of-use assets. (in millions of Korean won) 2025 Operating revenues Operating income Depreciation and amortization 1 ICT ₩ 4,682,007 400,114 810,484 Finance 825,492 53,517 7,890 Satellite TV 169,597 13,152 11,378 Real estate 133,238 16,099 16,794 Others 2,352,422 176,996 154,487 Subtotal 8,162,756 659,878 1,001,033 Elimination (1,317,639) 28,893 (32,357) Consolidated amount ₩ 6,845,117 688,771 968,676 1 Sum of the depreciation and amortization of property and equipment, intangible assets, investment properties and right-of-use assets. (3) Operating revenues for the three-month periods ended March 31, 2026 and 2025, and non-current assets as at March 31, 2026 and December 31, 2025, by geographical regions, are as follows:

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 62 (in millions of Korean won) Operating revenues Non-current assets 1 Location 2026 2025 March 31, 2026 December 31, 2025 Domestic ₩ 6,733,373 6,799,776 19,548,574 20,074,061 Overseas 45,075 45,341 151,890 151,198 Total ₩ 6,778,448 6,845,117 19,700,464 20,225,259 1 Sum of property and equipment, intangible assets, investment properties and right-of-use assets. 29. Related Party Transactions (1) The list of related party of the Group as at March 31, 2026, is as follows: Relationship Name of Entity Associates and joint ventures 49 entities such as K Bank Inc., KIF Investment Fund, Megazone Cloud Corporation, and KIAMCO Data Center Development Real Estate General Private Placement Investment Blind Trusts Others 1 Goody Studio Co., Ltd., Rebellion Inc., Digital Pharm Co., Ltd., Mastern No.127 Logispoint Daegu Co., KORAMKO No. 143 General Private Real Estate Investment Company and others 1 Included within the scope of related parties under Korean IFRS 1024 due to the presence of significant influence, even though treated in accordance with Korean IFRS 1109. (2) Outstanding balances of receivables and payables in relations to transactions with related parties as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 Receivables Payables Relationship Name of Entity Trade receivables Other receivables Trade payables Other payables Lease liabilities Associates and K Bank Inc. ₩ 1,019 68,058 8 1,005 - joint ventures Little Big Pictures 235 1,377 - 339 - K-Realty 11th Real Estate Investment Trust Company 166 1,482 - - 1,197 K-Realty No.3 Real Estate General Private Placement Investment 82 - - 326 98,465 Others 6,848 552 62 3,426 - Others Others 38 - - - - Total ₩ 8,388 71,469 70 5,096 99,662

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 63 (in millions of Korean won) December 31, 2025 Receivables Payables Relationship Name of Entity Trade receivables Other receivables Trade payables Other payables Lease liabilities Associates and joint ventures K Bank Inc. ₩ 2,089 53,865 - 795 - Little Big Pictures 235 1,382 - 249 - K-Realty 11th Real Estate Investment Trust Company 117 1,482 - - 1,719 K-Realty No.3 Real Estate General Private Placement Investment 185 - - 299 98,474 Others 6,419 747 161 1,228 - Others Others 228 66 - - - Total ₩ 9,273 57,542 161 2,571 100,193 (3) Significant transactions with related parties for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 Sales Purchases Acquisition of right-of- use assets Relationship Name of Entity Operating revenue Other income Operating expenses Others1 Associates and joint ventures K Bank Inc. ₩ 7,888 51 8,318 - - HD Hyundai Robotics Co., Ltd. 20 - - - - K-Realty 11th Real Estate Investment Trust Company 9 50 493 - - K-Realty No.3 Real Estate General Private Placement Investment Company - 82 841 - - Gaebong PFV Co., Ltd 4,719 - - - - Others 2 7,644 238 5,168 65 - Others Others 1 36 - - - Total ₩ 20,281 457 14,820 65 - 1The amount of acquisition of property, equipment and others is included.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 64 (in millions of Korean won) 2025 Sales Purchases Acquisition of right-of- use assets Relationship Name of Entity Operating revenue Other income Operating expenses Others1 Associates and joint ventures K Bank Inc. ₩ 8,509 - 6,094 - - HD Hyundai Robotics Co., Ltd. 19 - - - - K-Realty 11th Real Estate Investment Trust Company 9 50 595 - - K-Realty No.3 Real Estate General Private Placement Investment Company 21,577 81 - - - Others 2 6,536 176 12,670 10,533 - Others Others 1 - 61 - - Total ₩ 36,651 307 19,420 10,533 - 1The amount of acquisition of property, equipment and others is included. 2 Transactions with Trustay Co., Limited. before they were classified as non-affiliated companies are included. (in millions of Korean won) 2026 2025 Relationship Name of Entity Finance income Finance costs Dividend Income Finance income Finance costs Dividend income Associates and joint ventures K Bank Inc. ₩ 27 - 1,150 665 - - K-Realty 11th Real Estate Investment Trust Company - 11 - - 26 200 K-Realty No.3 Real Estate General Private Placement Investment Company - 807 - - - - Others - - - - - 26 - - 85 Total ₩ 27 818 1,176 665 26 285 (4) Key management compensation for the three-month periods ended March 31, 2026 and 2025, consists of: (in millions of Korean won) 2026 2025 Short-term benefits ₩ 446 435 Post-employment benefits 70 70 Share-based compensation 226 183 Total ₩ 742 688

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 65 (5) Fund transactions with related parties for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 Borrowing transactions1 Equity contributions in cash Borrowings Repayments Associates and joint ventures IBK-KT Young Entrepreneurs MARS Investment Fund ₩ - - 5,000 K-Realty 11th Real Estate Investment Trust Company - 1,310 - Solaire IPTV Content Fund - - 4,000 Others - - 178 Total ₩ - 1,310 9,178 1 Borrowing transactions include lease transactions. (in millions of Korean won) 2025 Borrowing transactions1 Equity contributions in cash Borrowings Repayments Associates and joint ventures IBK-KT Young Entrepreneurs MARS Investment Fund ₩ - - 6,000 K-Realty 11th Real Estate Investment Trust Company - 186 - Others - - 1,374 Total ₩ - 186 7,374 1 Borrowing transactions include lease transactions. (6) The Group has an obligation according to invest agreements with related parties such as KIAMCO Data Center Development Real Estate General Private Placement Investment Blind Trusts. As at March 31, 2026 the Group has a plan to make an additional investment of ₩ 75,234 million. (7) As at March 31, 2026, the limit of the credit card contract provided by the Group to K Bank Inc. and others is ₩ 1,520 million (December 31, 2025: ₩ 1,486 million).

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 66 30. Fair Value (1) Fair Value of Financial Instruments by Category Carrying amount and fair value of financial instruments by category as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Carrying amount Fair value Carrying amount Fair value Financial assets Cash and cash equivalents ₩ 2,860,116 1 3,506,971 1 Trade and other receivables Financial assets at amortized cost 2 7,899,765 1 7,572,857 1 Financial assets at fair value through other comprehensive income 241,952 241,952 107,644 107,644 Other financial assets Financial assets at amortized cost 1,675,030 1 1,476,527 1 Financial assets at fair value through profit or loss 914,623 914,623 774,557 774,557 Financial assets at fair value through other comprehensive income 2,851,607 2,851,607 2,423,277 2,423,277 Derivative financial assets for hedging 480,048 480,048 315,537 315,537 Total ₩ 16,923,141 16,177,370 Financial liabilities Trade and other payables ₩ 6,813,369 1 6,693,177 1 Borrowings 10,836,581 10,676,175 10,785,572 9,722,743 Other financial liabilities Financial liabilities at amortized cost 1,013,662 1 999,020 1 Financial liabilities at fair value through profit or loss - - 105,810 105,810 Derivative financial liabilities for hedging 3,646 3,646 13,862 13,862 Total ₩ 18,667,258 18,597,441 1 The Group did not conduct fair value estimation as the book amount is a reasonable approximation of the fair value. 2 Lease receivables are excluded from fair value disclosure in accordance with Korean IFRS 1107.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 67 (2) Fair Value Hierarchy Financial instruments that are measured at fair value are categorized by the fair value hierarchy, and the defined levels are as follows Level 1: The quoted (unadjusted) price in active markets for identical assets or liabilities that an entity can access at the measurement date. Level 2: All inputs other than quoted prices included in Level 1 that are observable (either directly that is, or indirectly that is, derived from prices) for the asset or liability. Level 3: The unobservable inputs for the asset or liability. Fair value hierarchy classifications of the financial assets and financial liabilities that are measured disclosed at fair value or its fair value is disclosed as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 Level 1 Level 2 Level 3 Total Assets Trade and other receivables Financial assets at fair value through other comprehensive income ₩ - 241,952 - 241,952 Other financial assets Financial assets at fair value through profit or loss 486 205,166 708,971 914,623 Financial assets at fair value through other comprehensive income 2,474,645 5,124 371,838 2,851,607 Derivative financial assets for hedging - 480,048 - 480,048 Total ₩ 2,475,131 932,290 1,080,809 4,488,230 Liabilities Borrowings ₩ - 10,676,175 - 10,676,175 Other financial liabilities Financial liabilities at fair value through profit or loss - - - - Derivative financial liabilities for hedging - 3,646 - 3,646 Total ₩ - 10,679,821 - 10,679,821

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 68 (In millions of Korean won) December 31, 2025 Level 1 Level 2 Level 3 Total Assets Trade and other receivables Financial assets at fair value through other comprehensive income ₩ - 107,644 - 107,644 Other financial assets Financial assets at fair value through profit or loss 3,562 64,237 706,758 774,557 Financial assets at fair value through other comprehensive income 2,044,434 5,319 373,524 2,423,277 Derivative financial assets for hedging - 315,537 - 315,537 Total ₩ 2,047,996 492,737 1,080,282 3,621,015 Liabilities Borrowings ₩ - 9,722,743 - 9,722,743 Other financial liabilities Financial liabilities at fair value through profit or loss - 432 105,378 105,810 Derivative financial liabilities for hedging - 13,862 - 13,862 Total ₩ - 9,737,037 105,378 9,842,415

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 69 (3) Transfers Between Fair Value Hierarchy Levels of Recurring Fair Value Measurements 1) Details of transfers between Level 1 and Level 2 of the fair value hierarchy for recurring fair value measurements There are no transfers between Level 1 and Level 2 of the fair value hierarchy for the recurring fair value measurements. 2) Details of changes in Level 3 of the fair value hierarchy for recurring fair value measurements. Details of changes in Level 3 of the fair value hierarchy for the recurring fair value measurements are as follows for the three-month periods ended March 31, 2026 and 2025: (in millions of Korean won) 2026 Financial assets Financial liabilities Financial assets at FVTPL Financial assets at FVOCI Financial liabilities at FVTPL Beginning balance ₩ 706,758 373,524 105,378 Acquisition 5,489 - - Transfer (585) 2,437 - Disposal (792) (1,920) (109,960) Amount recognized in profit or loss (1,899) - 4,582 Amount recognized in other comprehensive income - (2,203) - Ending balance ₩ 708,971 371,838 - (in millions of Korean won) 2025 Financial assets Financial liabilities Financial assets at FVTPL Financial assets at FVOCI Financial liabilities at FVTPL Beginning balance ₩ 842,612 342,830 132,011 Acquisition 7,369 - - Transfer - (108) - Disposal (38,946) (1,157) (381) Amount recognized in profit or loss (2,242) 24 (8,461) Amount recognized in other comprehensive income - (395) - Ending balance ₩ 808,793 341,194 123,169

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 70 (4) Valuation Techniques Valuation techniques and inputs used in the recurring and non-recurring fair value measurements and disclosed fair values categorized within Level 2 and Level 3 of the fair value hierarchy as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 Fair value Level Major valuation techniques Assets Trade and other receivables Financial assets at fair value through other comprehensive income ₩ 241,952 2 DCF Model Other financial assets Financial assets at fair value through profit or loss 914,137 2,3 DCF Model, Adjusted Net Asset Model, Backsolve Model, T-F Model Financial assets at fair value through other comprehensive income 376,962 2,3 DCF Model, Hull-White model, LSMC model, Backsolve Model, T-F Model Derivative financial assets for hedging 480,048 2 DCF Model Liabilities Borrowings 10,676,175 2 DCF Model Other financial liabilities Derivative financial liabilities for hedging 3,646 2 DCF Model

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 71 (in millions of Korean won) December 31, 2025 Fair value Level Major valuation techniques Assets Trade and other receivables Financial assets at fair value through other comprehensive income ₩ 107,644 2 DCF Model Other financial assets Financial assets at fair value through profit or loss 770,995 2,3 DCF Model, Adjusted Net Asset Model, Backsolve Model, T-F Model Financial assets at fair value through other comprehensive income 378,843 2,3 DCF Model, Hull-White model, LSMC model, Backsolve Model, T-F Model Derivative financial assets for hedging 315,537 2 DCF Model Liabilities Borrowings 9,722,743 2 DCF Model Other financial liabilities Financial liabilities at fair value through profit or loss 105,810 2,3 Binomial Option Pricing Model Derivative financial liabilities for hedging 13,862 2 DCF Model (5) Valuation Processes for Fair Value Measurements Categorized Within Level 3 The Group engages external experts that perform the fair value measurements required for financial reporting purposes. External experts report directly to the chief financial officer (CFO), and discuss the valuation processes and results with the CFO in line with the Group’s closing dates.

KT Corporation and Subsidiaries Notes to the Condensed Consolidated Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 72 31. Events After the Reporting Period (1) The Group decided on a quarterly dividend at the Board of Directors dated May 12, 2026, and the details are as follows. Type Details Dividend per share ₩ 600 (Total dividend: ₩ 143,863 million) Dividend yield 1.01% Dividend report date May 27, 2026 Dividend pay date June 11, 2026 (2) The Group plans to spin off the channel business division, including Channel CHING, ONT, and Health Medi TV, from KT ENA Co., Ltd. The spin-off will be effective May 1, 2026, and a new company will be established. Subsequently, the Group intends then intends to sell all shares of the new company to a third party.

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KT Corporation Index March 31, 2026 and 2025, and December 31, 2025 Page(s) Report on Review of Condensed Separate Interim Financial Statements... 1 – 2 Condensed Separate Interim Financial Statements Condensed Separate Interim Statements of Financial Position………………………. 3 – 4 Condensed Separate Interim Statements of Profit or Loss……………………………. 5 Condensed Separate Interim Statements of Comprehensive Income ………………. 6 Condensed Separate Interim Statements of Changes in Equity ……………………… 7 Condensed Separate Interim Statements of Cash Flows………………………………. 8 Notes to the Condensed Separate Interim Financial Statements ……………………. 9 – 56

Report on Review of Condensed Separate Interim Financial Statements (English Translation of a Report Originally Issued in Korean) To the Shareholders and Board of Directors of KT Corporation Reviewed Financial Statements We have reviewed the accompanying condensed separate interim financial statements of KT Corporation (the “Company”). These condensed separate interim financial statements consist of the separate interim statement of financial position of the Company as at March 31, 2026, and the related separate interim statements of profit or loss, comprehensive income, changes in equity and cash flows for the three-month period ended March 31, 2026, and material accounting policy information and other selected explanatory notes, expressed in Korean won. Management's Responsibility for the Financial Statements Management is responsible for the preparation and presentation of these condensed separate interim financial statements in accordance with International Financial Reporting Standards as adopted by the Republic of Korea (Korean IFRS) 1034 Interim Financial Reporting, and for such internal control as management determines is necessary to enable the preparation of condensed separate interim financial statements that are free from material misstatement, whether due to fraud or error. Auditor's Responsibility Our responsibility is to express a conclusion on these condensed separate interim financial statements based on our review. We conducted our review in accordance with quarterly or semi-annual review standards established by the Securities and Futures Commission of the Republic of Korea. A review of interim financial information consists of making inquiries, primarily of persons responsible for financial and accounting matters, and applying analytical and other review procedures. A review is substantially less in scope than an audit conducted in accordance with Korean Standards on Auditing and consequently does not enable us to obtain assurance that we would become aware of all significant matters that might be identified in an audit. Accordingly, we do not express an audit opinion. Conclusion Based on our review, nothing has come to our attention that causes us to believe the accompanying condensed separate interim financial statements are not prepared, in all material respects, in accordance with Korean IFRS 1034 Interim Financial Reporting.

Other Matters The separate interim statements of profit or loss, comprehensive income, changes in equity and cash flows for the three-month period ended March 31, 2025, presented herein for comparative purposes, were reviewed by Deloitte Anjin LLC whose report dated May 15, 2025. Based on their review, nothing has come to their attention that causes them to believe the accompanying separate interim financial statements are not presented fairly, in all material respects, in accordance with Korean IFRS No.1034 Interim Financial Reporting. The separate statement of financial position as at December 31, 2025, and the separate statements of profit or loss, comprehensive income, changes in equity and cash flows for the year then ended, not presented herein, were audited by Deloitte Anjin LLC who expressed an unqualified opinion on those statements on March 13, 2026. The separate statement of financial position as at December 31, 2025, presented herein for comparative purposes, is consistent, in all material respects, with the above audited separate statement of financial position as at December 31, 2025. Review standards and their application in practice vary among countries. The procedures and practices used in the Republic of Korea to review such financial statements may differ from those generally accepted and applied in other countries. May 15, 2026 Seoul, Korea This report is effective as of May 15, 2026, the review report date. Certain subsequent events or circumstances, which may occur between the review report date and the time of reading this report, could have a material impact on the accompanying condensed separate interim financial statements and notes thereto. Accordingly, the readers of the review report should understand that there is a possibility that the above review report may have to be revised to reflect the impact of such subsequent events or circumstances, if any. 2

KT Corporation Condensed Separate Interim Statements of Financial Position as at March 31, 2026 and December 31, 2025 (in millions of Korean won) Notes Assets Current assets Cash and cash equivalents 4,28 ₩ 1,268,879 ₩ 1,585,921 Trade and other receivables, net 4,5,28 3,220,858 2,915,727 Other financial assets 4,6,28 404,995 223,007 Inventories, net 7 173,434 94,282 Other current assets 8 2,453,248 2,393,578 Total current assets 7,521,414 7,212,515 Non-current assets Trade and other receivables, net 4,5,28 352,788 362,919 Other financial assets 4,6,28 3,140,418 2,684,482 Property and equipment, net 9 10,563,924 10,932,344 Right-of-use assets 16 810,120 812,243 Investment properties, net 9 1,183,616 1,123,857 Intangible assets, net 9 738,239 843,157 10 4,826,388 4,821,010 Other non-current assets 8 979,400 885,060 Total non-current assets 22,594,893 22,465,072 Total assets ₩ 30,116,307 ₩ 29,677,587 Investments in subsidiaries, associates and joint ventures March 31, 2026 December 31, 2025 3

KT Corporation Condensed Separate Interim Statements of Financial Position as at March 31, 2026 and December 31, 2025 (in millions of Korean won) Liabilities Current liabilities Trade and other payables 4,11,28 ₩ 4,234,222 ₩ 4,321,805 Borrowings 4,12,28 2,018,091 1,323,792 Other financial liabilities 4,6,28 13,409 10,359 Current tax liabilities 127,120 152,599 Provisions 13 277,779 295,369 Deferred income 19 50,962 51,027 Other current liabilities 4,8,16 756,855 707,342 Total current liabilities 7,478,438 6,862,293 Non-current liabilities Trade and other payables 4,11,28 134,318 207,070 Borrowings 4,12,28 5,006,607 5,744,913 Other financial liabilities 4,6,28 596 13,862 Net defined benefit liabilities 14 55,613 27,160 Provisions 13 88,655 90,210 Deferred income 19 123,772 128,241 Deferred tax liabilities 1,024,149 925,355 Other non-current liabilities 4,8,16 449,289 451,923 Total non-current liabilities 6,882,999 7,588,734 Total liabilities 14,361,437 14,451,027 Equity Share capital 1,564,499 1,564,499 Share premium 1,440,258 1,440,258 Retained earnings 17 12,417,450 12,219,860 Accumulated other comprehensive income 964,750 636,965 Other components of equity 18 (632,087) (635,022) Total equity 15,754,870 15,226,560 Total liabilities and equity ₩ 30,116,307 ₩ 29,677,587 - - March 31, 2026 December 31, 2025 The above separate interim statements of financial position should be read in conjunction with the accompanying notes. 4

KT Corporation Condensed Separate Interim Statements of Profit or Loss For the three-month periods ended March 31, 2026 and 2025 (in millions of Korean won, except per share amounts) Notes Operating revenue 19 ₩ 4,834,631 ₩ 4,682,007 Operating expenses 20 4,520,703 4,281,893 Operating profit 313,928 400,114 Other income 21 136,647 64,594 Other expenses 21 48,243 27,589 Finance income 22 238,042 87,893 Finance costs 22 225,104 76,691 Profit before income tax 415,270 448,321 Income tax expense 23 75,249 82,944 Profit for the period ₩ 340,021 ₩ 365,377 Earnings per share Basic earnings per share 24 ₩ 1,410 ₩ 1,487 Diluted earnings per share 24 1,410 1,486 2026 2025 The above separate Interim statements of profit or loss should be read in conjunction with the accompanying notes. 5

KT Corporation Condensed Separate Interim Statements of Comprehensive Income For the three-month periods ended March 31, 2026 and 2025 (in millions of Korean won) Notes Profit for the period ₩ 340,021 ₩ 365,377 Other comprehensive income (loss) Items that will not be reclassified to profit or loss: 14 (1,877) 4,610 323,567 (5,432) Items that may be subsequently reclassified to profit or loss: 6 124,962 13,881 (116,549) 1,330 Other comprehensive income fore the preiod, net of tax ₩ 330,103 ₩ 14,389 Total comprehensive income for the period ₩ 670,124 ₩ 379,766 The above separate Interim statements of comprehensive income should be read in conjunction with the accompanying notes. at fair value through other comprehensive income Valuation gain on cash flow hedges Other comprehensive income (loss) from cash flow hedges reclassified to profit or loss Valuation gain (losses) on equity instruments 2026 2025 Remeasurements of net defined benefit liabilities 6

KT Corporation Condensed Separate Interim Statements of Changes in Equity For the three-month periods ended March 31, 2026 and 2025 (in millions of Korean won) Notes Balance as at January 1, 2025 ₩ 1,564,499 ₩ 1,440,258 ₩ 11,717,929 ₩ 86,478 ₩ (389,024) ₩ 14,420,140 Comprehensive income Profit for the year - - 365,377 - - 365,377 Valuation gains(losses) on financial assets at fair value through other comprehensive income 6 - - (2) (5,430) - (5,432) Remeasurements of net defined benefit liabilities 14 - - 4,610 - - 4,610 Valuation gain on cash flow hedge 6 - - - 15,211 - 15,211 Total comprehensive income for the year - - 369,985 9,781 - 379,766 Transactions with equity holders - Dividends paid - - (122,836) - - (122,836) Appropriation of retained earnings related to loss on disposal of treasury stock 18 - - (57) - 57 - Acquisition of treasury stock - - - - (47,197) (47,197) Others - - - - 1,764 1,764 Balance as at March 31, 2025 ₩ 1,564,499 ₩ 1,440,258 ₩ 11,965,021 ₩ 96,259 ₩ (434,400) ₩ 14,631,637 Balance as at January 1, 2026 ₩ 1,564,499 ₩ 1,440,258 ₩ 12,219,860 ₩ 636,965 ₩ (635,022) 15,226,560 Comprehensive income Profit for the year - - 340,021 - - 340,021 Valuation gains(losses) on financial assets at fair value through other comprehensive income 6 - - 4,195 319,372 - 323,567 Remeasurements of net defined benefit liabilities 14 - - (1,877) - - (1,877) Valuation gain on cash flow hedge 6 - - - 8,413 - 8,413 Total comprehensive income for the year - - 342,339 327,785 - 670,124 Transactions with equity holders Dividends paid - - (144,658) - (144,658) disposal of treasury stock 18 - - (91) - 91 - Disposal of treasury stock - - - - 58 58 Others - - - - 2,786 2,786 Balance as at March 31, 2026 ₩ 1,564,499 ₩ 1,440,258 ₩ 12,417,450 ₩ 964,750 ₩ (632,087) ₩ 15,754,870 The above separate Interim statements of changes in equity should be read in conjunction with the accompanying notes. Total Other components of equityShare capital Share premium Retained earnings Accumulated other comprehensive income 7

KT Corporation Condensed Separate Interim Statements of Cash Flows For the three-month periods ended March 31, 2026 and 2025 (in millions of Korean won) Notes Cash flows from operating activities Cash generated from operations 25 ₩ 837,939 ₩ 899,443 Interest paid (77,417) (85,666) Interest received 41,652 41,808 Dividends received 3,720 - Income tax paid (61,857) (7,091) Cash flows from operating activities 744,037 848,494 Cash flows used in investing activities Collection of loans 7,393 9,563 Disposal of financial assets at fair value through profit or loss 1,830 3,009 Disposal of financial assets at fair value through other comprehensive income Disposal of investments in subsidiaries, associates and joint ventures 4,422 7,096 Disposal of property and equipment 17,731 28,499 Disposal of intangible assets - 2,302 Disposal of right-of-use assets 20 20 Loans granted (2,336) (5,005) Acquisition of financial instruments at amortized cost (45,043) (52,803) Acquisition of financial assets at fair value through profit or loss (2,315) (291) Acquisition of investments in subsidiaries, associates and joint ventures (9,800) (5,800) Acquisition of property and equipment (478,749) (627,945) Acquisition of right-of-use assets - (38) Cash flows used in investing activities (495,162) (641,251) Cash flows used in financing activities Proceeds from borrowings 298,951 1,090,657 Repayments of borrowings (510,247) (1,280,247) Cash outflow under derivatives contracts - (3,724) Acquisition of treasury stock - (47,197) Decrease in lease liabilities (78,998) (79,032) Cash flows used in financing activities 26 (290,294) (319,543) Effect of exchange rate change on cash and cash equivalents 312 (250) Net increase in cash and cash equivalents (41,107) (112,550) Cash and cash equivalents Beginning of the period 1,585,921 1,540,570 End of the period ₩ 1,544,814 ₩ 1,428,020 The above Interim separate statements of cash flows should be read in conjunction with the accompanying notes. 2026 2025 11,685 142 8

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 9 1. General Information KT Corporation (the “Company”) commenced operations on January 1, 1982, when it spun off from the Korea Communications Commission (formerly the Korean Ministry of Information and Communications) to provide telecommunication services and to engage in the development of advanced communications services under the Act of Telecommunications of Korea. The address of the Company’s registered office is 90, Buljeonga-ro, Bundang-gu, Seongnam City, Gyeonggi Province, Korea. On October 1, 1997, upon the announcement of the Act on the Management of Government-Invested Institutions and the Privatization Law, the Company became a government-funded institution under the Commercial Code of Korea. On December 23, 1998, the Company’s shares were listed on the Korea Exchange. On May 29, 1999, the Company issued 24,282,195 additional shares and issued American Depository Shares (ADS), which represents new shares and 20,813,311 government-owned shares, on the New York Stock Exchange. On July 2, 2001, additional ADS, representing 55,502,161 government-owned shares, were issued on the New York Stock Exchange. In 2002, the Company acquired the entire government-owned shares in accordance with the Korean government’s privatization plan. As at March 31,2026, the Korean government does not own any shares in the Company.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 10 2. Material Accounting Policies 2.1 Basis of Preparation The Company maintains its accounting records in Korean won and prepares statutory financial statements in the Korean language (Hangul) in accordance with International Financial Reporting Standards as adopted by the Republic of Korea (“Korean IFRS” or “K-IFRS”). The accompanying separate interim financial statements have been condensed, reformatted, and translated into English from the original Korean language financial statements. The separate interim financial statements of the Company for the three-month period ended March 31, 2026, have been prepared in accordance with Korean IFRS 1034 Interim Financial Reporting and are separate financial statements in accordance with K-IFRS 1027. In order to understand the interim financial statements, the annual financial statements as at December 31, 2025 prepared in accordance with K-IFRS should be used together. 2.2 Changes in Accounting Policies and Disclosures (1) New and amended standards and interpretations adopted by the Company The Company has applied the following standards and interpretations for the first time for their annual reporting period commencing January 1, 2026. - Amendments to Korean IFRS 1109 Financial Instruments and Korean IFRS 1107 Financial Instruments: Disclosures Korean IFRS 1109 Financial Instruments and Korean IFRS 1107 Financial Instruments: Disclosures have been amended to respond to recent questions arising in practice, and to include new requirements. clarify the date of recognition and derecognition of some financial assets and liabilities, with a new exception for some financial liabilities settled through an electronic cash transfer system; clarify and add further guidance for assessing whether a financial asset meets the solely payments of principal and interest (SPPI) criterion; add new disclosures of impact on the entity and the extent to which the entity is exposed for each type of financial instruments if the timing or amount of contractual cash flow changes due to amendment of contract term; and update the disclosures for equity instruments designated at fair value through other comprehensive income (FVOCI).

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 11 - Annual Improvements to Korean IFRS -Volume 11 Annual Improvements to Korean IFRS -Volume 11 should be applied for annual periods beginning on or after January 1, 2026. Korean IFRS 1101 First-time Adoption of International Financial Reporting Standards: Hedge accounting by a first-time adopter Korean IFRS 1107 Financial Instruments: Disclosures: Gain or loss on derecognition and implementation guidance Korean IFRS 1109 Financial Instruments: Derecognition of lease liabilities and definition of transaction price Korean IFRS 1110 Consolidated Financial Statements: Determination of a ‘de facto agent’ Korean IFRS 1007 Statement of Cash Flows: Cost method - Amendments to Korean IFRS 1109 Financial Instruments and Korean IFRS 1107 Financial Instruments: Disclosures - Contracts Referencing Nature-dependent Electricity Contracts referencing nature-dependent electricity are defined contracts that expose an entity to variability in the underlying amount of electricity because the source of electricity generation depends on uncontrollable natural conditions (for example, the weather). The amendments clarify that ‘contracts to buy or sell such electricity’ are assessed for eligibility under the own-use exemption. In addition, the amendments modify hedge accounting requirements by allowing an entity to designate as the hedged item a variable nominal amount of forecast electricity transactions that reflect the nature-dependent variability of electricity and introduce additional disclosure requirements. (2) New and amended standards not yet adopted by the Company The following new and amended accounting standards and interpretations have been issued but are not mandatory for the annual reporting period ending on December 31, 2026.: - Korean IFRS 1118 Presentation and Disclosure in Financial Statements Korean IFRS 1118 Presentation and Disclosure in Financial Statements replaces Korean IFRS 1001 Presentation of Financial Statements. Korean IFRS 1118 is expected to increase comparability of the financial performance of similar entities by providing users with more useful information for analyzing and comparing the entity’s performance based on the income statement. Korean IFRS 1118 should be first applied for annual periods beginning on or after January 1, 2027, and earlier application is permitted. In accordance with Korean IFRS 1008 Accounting Policies, Changes in Accounting Estimates and Errors, the comparative information for the year ended December 31, 2026, shall be restated under Korean IFRS 1118 as the Company is required to apply the standard retrospectively. When the Company prepares its financial statements by applying Korean IFRS 1118, the following material accounting policies are expected to result in significant differences compared to the current financial statements. These items do not include all differences that may arise in the future and may be subject to change based on the results of additional analysis.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 12 Changes in presentation of income statement Introduction of disclosure of management-defined performance measures Changes in classification of cash flows The Company is reviewing the impact of the above-listed amendments on the financial statements. 2.3 Accounting Policies The material accounting policies and methods of computation used in the presentation of the separate interim financial statements are consistent with those of the separate financial statements for the year ended December 31, 2025, except for the changes resulting from the application of amendments and enactments of standards described in Note 2.2 (1) and as detailed below. 2.3.1 Income Tax Expense Income tax expense for the interim period is recognized based on management’s best estimate of the weighted average annual income tax rate expected for the full financial year. The estimated average annual effective income tax rate is applied to the pre-tax income of the interim period. The Company is subject to Pillar Two income taxes and has reviewed the impact on the financial statements. As a result of this assessment, The Company recognized an additional income tax expenses in relation to the rules and applied the exception to recognizing and disclosing information about deferred tax and assets and liabilities related to Pillar Two income Taxes. 3. Critical Accounting Estimates and Assumptions The preparation of financial statements requires the Company to make estimates and assumptions about the future. Management also needs to exercise judgement in applying the Company’s accounting policies. Estimates and assumptions are continuously evaluated and are based on historical experience and other factors, including reasonable expectations of future events under the given circumstances. As the resulting accounting estimates will, by definition, rarely equal the actual results, they involve a significant risk of resulting in material adjustments.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 13 4. Financial Instruments by Category Financial instruments by category as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 Financial assets Financial assets at amortized cost Financial assets at FVTPL Financial assets at FVOCI Derivatives used for hedging Total Cash and cash equivalents ₩ 1,268,879 - - - 1,268,879 Trade and other receivables 3,331,694 - 241,952 - 3,573,646 Other financial assets 155,507 346,462 2,570,066 473,378 3,545,413 (in millions of Korean won) March 31, 2026 Financial liabilities Financial liabilities at amortized cost Financial liabilities at FVTPL Derivatives used for hedging Others Total Trade and other payables1 ₩ 4,156,009 - - - 4,156,009 Borrowings 7,024,698 - - - 7,024,698 Other financial liabilities - 10,359 3,646 - 14,005 Lease liabilities - - - 691,529 691,529 1 Amounts related to employee benefit plans are excluded in Trade and other payables. (in millions of Korean won) December 31, 2025 Financial assets Financial assets at amortized cost Financial assets at FVTPL Financial assets at FVOCI Derivatives used for hedging Total Cash and cash equivalents ₩ 1,585,921 - - - 1,585,921 Trade and other receivables 3,171,002 - 107,644 - 3,278,646 Other financial assets 110,465 344,938 2,139,753 312,333 2,907,489 (in millions of Korean won) December 31, 2025 Financial liabilities Financial liabilities at amortized cost Financial liabilities at FVTPL Derivatives used for hedging Others Total Trade and other payables1 ₩ 4,328,561 - - - 4,328,561 Borrowings 7,068,705 - - - 7,068,705 Other financial liabilities - 10,359 13,862 - 24,221 Lease liabilities - - - 685,732 685,732 1 Amounts related to employee benefit plans are excluded in Trade and other payables.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 14 5. Trade and Other Receivables (1) Trade and other receivables as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 Total amounts Provision for impairment Present value discount Carrying amount Current assets Trade receivables ₩ 3,107,388 (299,072) (7,065) 2,801,251 Other receivables 457,007 (36,170) (1,230) 419,607 Total ₩ 3,564,395 (335,242) (8,295) 3,220,858 Non-current assets Trade receivables ₩ 225,020 (927) (11,777) 212,316 Other receivables 149,059 (245) (8,342) 140,472 Total ₩ 374,079 (1,172) (20,119) 352,788 (in millions of Korean won) December 31, 2025 Total amounts Provision for impairment Present value discount Carrying amount Current assets Trade receivables ₩ 2,846,416 (297,704) (7,772) 2,540,940 Other receivables 413,486 (36,143) (2,556) 374,787 Total ₩ 3,259,902 (333,847) (10,328) 2,915,727 Non-current assets Trade receivables ₩ 276,633 (928) (14,078) 261,627 Other receivables 107,804 (309) (6,203) 101,292 Total ₩ 384,437 (1,237) (20,281) 362,919

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 15 (2) Details of other receivables as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Loans ₩ 27,656 32,721 Receivables 283,251 278,288 Accrued income 89,646 1,234 Refundable deposits 195,941 200,288 Less: Provision for impairment (36,415) (36,452) Total ₩ 560,079 476,079 (3) The maximum exposure of trade and other receivables to credit risk is the carrying amount of each class of receivables mentioned above as at March 31, 2026. (4) The Company classifies a certain portion of the trade receivables as financial assets at fair value through other comprehensive income, based on business model for managing the asset and the cash flow characteristics of the contract.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 16 6. Other Financial Assets and Liabilities (1) Details of other financial assets and liabilities as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Other financial assets Financial assets at amortized cost 1 ₩ 155,507 110,465 Financial assets at fair value through profit or loss 2 346,462 344,938 Financial assets at fair value through other comprehensive income 2,570,066 2,139,753 Derivatives used for hedging 473,378 312,333 Less: Non-current (3,140,418) (2,684,482) Current ₩ 404,995 223,007 Other financial liabilities Financial liabilities at fair value through profit or loss ₩ 10,359 10,359 Derivatives used for hedging 3,646 13,862 Less: Non-current (596) (13,862) Current ₩ 13,409 10,359 1 As at March 31, 2026, the Company’s financial instruments amount to ₩ 30,464 million (December 31, 2025: ₩ 30,464 million) and consist of checking account deposits, time deposits, and others which are subject to withdrawal restrictions. 2 As at March 31, 2026, the Company provided investment in Korea Software Financial Cooperative and others amounting to ₩ 1,136 million (December 31, 2025: ₩ 1,136 million) as collateral in exchange for the payment guarantee provided by the Korea Software Financial Cooperative and others. (2) Financial Assets at fair value through profit or loss 1) Details of financial assets at fair value through profit or loss as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Debt instruments ₩ 346,462 344,938 Less: Non-current (346,462) (344,938) Current ₩ - - 2) The maximum exposure to credit risks of debt instruments of financial assets at fair value through profit or loss is the carrying amount of each class of debt instruments above as at March 31, 2026.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 17 (4) Financial Assets at fair value through other comprehensive income 1) Details of financial assets at fair value through other comprehensive income as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Equity instruments (Listed) ₩ 2,473,826 2,043,513 Equity instruments (Unlisted) 96,240 96,240 Less: Non-current (2,570,066) (2,139,753) Current ₩ - - 2) Upon disposal of these equity instruments, any balance within the other comprehensive income is reclassified not to profit or loss, but to retained earnings. Upon disposal of these debt instruments, the remaining balance of the accumulated other comprehensive income is reclassified to profit or loss.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 18 (5) Derivatives used for hedging 1) Details of valuation of derivatives used for hedging as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Assets Liabilities Assets Liabilities Currency swap 1 ₩ 473,378 3,646 312,333 13,862 Less: Non-current (223,887) (596) (199,787) (13,862) Current ₩ 249,491 3,050 112,546 - 1 The currency swap contract is to hedge the risk of volatility in cash flow from the borrowings due to changes in interest rate and foreign exchange rate and the expected maximum period for the Company to be exposed to risks of cash flow volatility by hedged items is until September 7, 2034. The entire fair value of a hedging derivative is classified as a non-current asset or liability if the remaining maturity of the hedged item exceeds 12 months and, as a current asset or liability, if the maturity of the hedged item is within 12 months. 2) Details of valuation gains and losses from derivatives for risk hedging purposes for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Type of transaction Valuation gain Valuation loss Other comprehensive Income(loss)1 Valuation gain Valuation loss Other comprehensive Income(loss)1 Currency swap ₩ 159,763 - 11,497 5,814 7,183 20,144 1 The amounts directly reflected in equity are before adjustments of deferred income tax. 3) The effective portion recognized in profit or loss related to cash flow hedges amounts to valuation gains of ₩ 170,947 million as other comprehensive income for the three-month period ended March 31, 2026 (three-month period ended March 31, 2025: ₩ 18,706 million). The ineffective portion recognized in profit or loss related to cash flow hedges amounts to valuation gains of ₩ 313 million as current profit or loss for the three-month period ended March 31, 2026 (three-month period ended March 31, 2025: ₩ 242 million). In addition, the valuation loss reclassified from other comprehensive income to profit or loss amounts to ₩ 159,450 million for the three-month period ended March 31, 2026 (three-month period ended March 31, 2025: valuation loss of ₩ 1,438 million).

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 19 (6) Financial Liabilities at fair value through profit or loss 1) Details of financial liabilities at fair value through profit or loss as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Derivative liabilities held for trading 1 ₩ 10,359 10,359 1 Derivative liabilities recognized in relation to acquisition of Epsilon Global Communications Pte. Ltd. (Note 15). 7. Inventories Inventories as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Acquisition cost Valuation allowance Carrying amount Acquisition cost Valuation allowance Carrying amount Merchandise ₩ 192,096 (18,662) 173,434 120,002 (25,720) 94,282 Cost of inventories recognized as expenses for the three-month period ended March 31, 2026 amounts to ₩ 806,238 million (for the three-month period ended March 31, 2025: ₩ 686,027 million), and reversal valuation loss on inventory amounts to ₩ 7,058 million for the three-month period ended March 31, 2026 (for the three-month period ended March 31, 2025: ₩ 24,837 million).

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 20 8. Other Assets and Liabilities Other assets and liabilities as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Other assets Advance payments ₩ 57,358 36,425 Prepaid expenses 256,465 174,560 Contract costs 2,215,708 2,178,978 Contract assets 903,117 888,675 Less: Non-current (979,400) (885,060) Current ₩ 2,453,248 2,393,578 Other liabilities Advances received 1 ₩ 242,330 240,198 Withholdings 53,263 22,265 Unearned revenue 3,215 555 Lease liabilities 691,529 685,732 Contract liabilities 215,807 210,515 Less: Non-current (449,289) (451,923) Current ₩ 756,855 707,342 1 The amounts include adjustments arising from adoption of Korean IFRS 1115 Revenue from Contracts with Customers (Note 19). 9. Property and Equipment, Investment Properties, and Intangible Assets (1) Changes in property and equipment for the three-month periods ended March 31, 2026 and 2025, are as follows: (In millions of Korean won) 2026 2025 Beginning, net ₩ 10,932,344 11,477,680 Acquisition and capital expenditure 333,089 311,361 Disposal and termination (25,767) (31,987) Depreciation (590,770) (615,062) Transfer to investment properties (71,123) (7,730) Others 1 (13,849) (65,989) Ending, net ₩ 10,563,924 11,068,273 1 Amounts include transfers to intangible assets. (2) Changes in investment properties for the three-month periods ended March 31, 2026 and 2025, are as follows: (In millions of Korean won) 2026 2025 Beginning, net ₩ 1,123,857 1,114,379 Depreciation (11,364) (11,348) Transfer from property and equipment 71,123 7,730 Ending, net ₩ 1,183,616 1,110,761

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 21 (3) As at March 31, 2026, the Company (Lessor) has entered into a non-cancellable operating lease contract for real estate. The future minimum lease payments under this contract amount to ₩ 162,504 million for one year or less, ₩ 292,212 million for more than one year and less than five years, ₩ 545,998 million for over five years, and ₩ 1,000,714 million in total. (4) Changes in intangible assets for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Beginning, net ₩ 843,157 1,104,680 Acquisition and capital expenditure 1 16,828 70,414 Disposal and termination (696) (1,959) Amortization (121,050) (114,926) Ending, net ₩ 738,239 1,058,209 1 Amounts include transfers from property and equipment. (5) The carrying amount of goodwill and memberships assessed to have indefinite useful life and, therefore, not subject to amortization is ₩ 65,057 million (December 31, 2025: ₩ 65,057 million) and ₩ 58,901 million (December 31, 2025: ₩ 56,483 million), respectively as at March 31, 2026.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 22 10. Investments in Subsidiaries, Associates and Joint Ventures (1) Carrying amounts in investments in subsidiaries, associates and joint ventures as at March 31, 2026 and December 31, 2025, is as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Subsidiaries ₩ 4,413,412 4,413,412 Associates and joint ventures 412,976 407,598 Total ₩ 4,826,388 4,821,010 1) Investments in subsidiaries as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) Location Percentage of ownership (%) Carrying amount March 31, 2026 December 31, 2025 KT Estate Inc. Korea 100.0% ₩ 1,084,522 1,084,522 KT Sat Co., Ltd. Korea 100.0% 390,530 390,530 KTCS Corporation 1 Korea 8.4% 6,427 6,427 KTIS Corporation 1 Korea 33.4% 30,633 30,633 KT Skylife Co., Ltd. Korea 50.5% 311,696 311,696 BC Card Co., Ltd. Korea 69.5% 633,004 633,004 KT M&S Co., Ltd. Korea 100.0% 26,914 26,914 KT Alpha Co., Ltd. Korea 70.5% 130,924 130,924 KT Telecop Co., Ltd. Korea 92.7% 138,541 138,541 KT Nasmedia Co., Ltd. 1 Korea 44.7% 23,051 23,051 KTDS Co., Ltd. Korea 91.6% 19,616 19,616 KTGDH Co., Ltd. Korea 100.0% 2,745 2,745 KT Sports Co., Ltd. Korea 52.6% 32,277 32,277 KT M Mobile Co., Ltd. Korea 100.0% 102,237 102,237 KT Service Bukbu Co., Ltd. Korea 78.9% 8,873 8,873 KT Service Nambu Co., Ltd. Korea 84.0% 24,321 24,321 KT Strategic Investment Fund No.3 Korea 86.7% - - KT MOS Bukbu Co., Ltd. Korea 100.0% 6,334 6,334 KT MOS Nambu Co., Ltd. Korea 98.4% 4,267 4,267 Next Connect PFV Korea 100.0% 24,250 24,250 KT Strategic Investment Fund No.5 Korea 95.0% 17,575 17,575 KT Engineering Co., Ltd. Korea 59.8% 28,000 28,000 KT Studio Genie Co., Ltd. Korea 90.9% 283,620 283,620 KT ES Pte. Ltd. Singapore 68.8% 16,003 16,003 kt Altimedia Corporation Korea 100.0% 22,000 22,000 kt Cloud Co., Ltd. Korea 92.6% 901,504 901,504 kt netcore Co. Ltd Korea 100.0% 61,000 61,000 kt p&m Co. Ltd Korea 100.0% 10,000 10,000 Others 72,548 72,548 Total ₩ 4,413,412 4,413,412

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 23 1 As at March 31, 2026, although sum of percentage of ownership of the Company and its subsidiaries is less than 50% ownership in these entities, these entities are included in investments in subsidiaries due to the dispersion of other shareholders excluding the Company and voting patterns at previous shareholders’ meetings. 2) Investments in associates and joint ventures as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) Location Percentage of ownership (%) Carrying amount March 31, 2026 December 31, 2025 KIF Investment Fund Korea 33.3% ₩ 115,636 115,636 HD Hyundai Robotics Co., Ltd. 1 Korea 10.0% 50,000 50,000 Megazone Cloud Corporation 1 Korea 6.7% 130,001 130,001 KT-DSC Creative Economy YouthStart-up Investment Fund 1 Korea 17.1% 1,665 1,665 Others 115,674 110,296 Total ₩ 412,976 407,598 1 The Company holds less than 20% interest in the investees as at March 31, 2026, but the investments are classified as investments in associates as the Company exerts significant influence over the operational and financial policies. (2) Changes in investments in subsidiaries, associates and joint ventures for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Beginning ₩ 4,821,010 4,831,186 Acquisition 9,800 5,800 Disposal (4,422) (4,870) Ending ₩ 4,826,388 4,832,116

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 24 11. Trade and Other Payables (1) Details of trade and other payables as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Current liabilities Trade payables ₩ 955,978 652,458 Other payables 3,278,244 3,669,347 Total ₩ 4,234,222 4,321,805 Non-current liabilities Other payables ₩ 134,318 207,070 (2) Details of other payables as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Non-trade payable ₩ 1,905,691 2,511,680 Accrued expenses 1,053,384 919,711 Operating deposits 352,219 343,483 Others 101,268 101,543 Less: Non-current (134,318) (207,070) Current ₩ 3,278,244 3,669,347

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 25 12. Borrowings (1) Details of borrowings as at March 31, 2026 and December 31, 2025, are as follows: 1) Debentures (in millions of Korean won and foreign currencies in thousands) March 31, 2026 December 31, 2025 Type Maturity Annual interest rates Foreign currency Korean won Foreign currency Korean won MTNP notes 1 Sep. 7, 2034 6.500% USD 100,000 ₩ 151,340 USD 100,000 ₩ 143,490 MTNP notes Jul. 18, 2026 2.500% USD 400,000 605,360 USD 400,000 573,960 MTNP notes Jan. 21, 2027 1.375% USD 300,000 454,020 USD 300,000 430,470 MTNP notes Feb. 2, 2028 4.125% USD 500,000 756,700 USD 500,000 717,450 MTNP notes Mar. 5, 2027 1.217% JPY 23,300,000 220,588 JPY 23,300,000 213,808 MTNP notes Mar. 7, 2028 1.367% JPY 6,700,000 63,431 JPY 6,700,000 61,481 MTNP notes Jan. 3, 2029 4.375% USD 500,000 756,700 USD 500,000 717,450 MTNP notes 2 Sep. 29, 2028 Compounded SOFR(3M)+0.66% USD 200,000 302,680 USD 200,000 286,980 The 183-3rd Public bond Dec. 22, 2031 4.270% - 160,000 - 160,000 The 184-3rd Public bond Apr. 10, 2033 3.170% - 100,000 - 100,000 The 186-4th Public bond Jun. 26, 2034 3.695% - 100,000 - 100,000 The 187-4th Public bond Sep. 2, 2034 3.546% - 100,000 - 100,000 The 188-3rd Public bond Jan. 29, 2035 2.706% - 50,000 - 50,000 The 189-3rd Public bond Jan. 28, 2026 - - - - 100,000 The 189-4th Public bond Jan. 28, 2036 2.351% - 70,000 - 70,000 The 190-3rd Public bond Jan. 30, 2028 2.947% - 170,000 - 170,000 The 190-4th Public bond Jan. 30, 2038 2.931% - 70,000 - 70,000 The 191-3rd Public bond Jan. 15, 2029 2.160% - 110,000 - 110,000 The 191-4th Public bond Jan. 14, 2039 2.213% - 90,000 - 90,000 The 192-3rd Public bond Oct. 11, 2029 1.622% - 50,000 - 50,000 The 192-4th Public bond Oct. 11, 2039 1.674% - 110,000 - 110,000 The 193-3rd Public bond Jun. 17, 2030 1.608% - 20,000 - 20,000 The 193-4th Public bond Jun. 15, 2040 1.713% - 60,000 - 60,000 The 194-2nd Public bond Jan. 27, 2026 - - - - 140,000 The 194-3rd Public bond Jan. 27, 2031 1.849% - 50,000 - 50,000 The 194-4th Public bond Jan. 25, 2041 1.976% - 80,000 - 80,000 The 195-2nd Public bond Jun. 10, 2026 1.806% - 80,000 - 80,000 The 195-3rd Public bond Jun. 10, 2031 2.168% - 40,000 - 40,000 The 196-2nd Public bond Jan. 27, 2027 2.637% - 100,000 - 100,000 The 196-3rd Public bond Jan. 27, 2032 2.741% - 30,000 - 30,000 The 197-2nd Public bond Jun. 29, 2027 4.188% - 120,000 - 120,000 The 198-2nd Public bond Jan. 12, 2026 - - - - 150,000 The 198-3rd Public bond Jan. 12, 2028 3.971% - 80,000 - 80,000

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 26 (in millions of Korean won and foreign currencies in thousands) March 31, 2026 December 31, 2025 Type Maturity Annual interest rates Foreign currency Korean won Foreign currency Korean won The 199-2nd Public bond Jul. 10, 2026 4.146% - 160,000 - 160,000 The 199-3rd Public bond Jul. 12, 2028 4.221% - 155,000 - 155,000 The 200-1st Public bond Feb. 27, 2026 - - - - 120,000 The 200-2nd Public bond Feb. 26, 2027 3.608% - 200,000 - 200,000 The 200-3rd Public bond Feb. 27, 2029 3.548% - 80,000 - 80,000 The 201-1st Public bond Dec. 2, 2027 2.899% - 130,000 - 130,000 The 201-2nd Public bond Dec. 2, 2029 2.918% - 70,000 - 70,000 The 201-3rd Public bond Dec. 2, 2034 3.057% - 100,000 - 100,000 The 202-1st Public bond Nov. 27, 2028 3.052% - 80,000 - 80,000 The 202-2nd Public bond Nov. 27, 2030 3.221% - 40,000 - 40,000 The 202-3rd Public bond Nov. 27, 2035 3.460% - 40,000 - 40,000 The 202-4th Public bond Nov. 27, 2045 3.682% - 40,000 - 40,000 The 203-1st Public bond Mar. 04, 2029 3.487% 160,000 - The 203-2nd Public bond Mar. 04, 2031 3.619% 50,000 - The 203-3rd Public bond Mar. 04, 2036 3.910% 50,000 - The 203-4th Public bond Mar. 04, 2046 4.018% 40,000 - Subtotal 6,545,819 6,590,089 Less: Current portion (1,817,844) (1,323,299) Discount on bonds (21,368) (21,877) Total ₩ 4,706,607 5,244,913 1 As at March 31, 2026, the Company has outstanding notes in the amount of USD 100 million with fixed interest rates under Medium Term Note Program (“MTNP”) registered on the Singapore Stock Exchange, which allowed the issuance of notes of up to USD 2,000 million. However, the MTN program was terminated in 2007. 2 The interest rates for Daily SOFR is approximately 3.680% as at March 31, 2026.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 27 2) Long-Term Borrowings (in millions of Korean won and foreign currencies in thousands) Financial institution Type Maturity Annual interest rates March 31, 2026 December 31, 2025 Export-Import Bank of Korea Inter-Korean Cooperation Fund 1 Jul. 10, 2026 1.000% ₩ 247 493 CA-CIB Long-term commercial papers Feb. 26, 2027 3.020% 100,000 100,000 Long-term commercial papers May. 28, 2027 3.820% 100,000 100,000 DBS Long-term commercial papers Long-term commercial papers Feb. 26, 2027 2.980% 100,000 100,000 May. 28, 2027 3.820% 100,000 100,000 Shinhan Bank Structured loans Aug. 9, 2027 3.390% 50,000 50,000 Long-term commercial papers Aug. 9, 2027 3.390% 50,000 50,000 Subtotal 500,247 500,493 Less: Current portion (200,247) (493) Net ₩ 300,000 500,000 1 The above Inter-Korean Cooperation Fund is repayable in installments over 13 years after a 7-year grace period. (2) Repayment schedule of the Company’s debentures and borrowings including the portion of current liabilities as at March 31, 2026, is as follows: (in millions of Korean won) Bonds In local currency In foreign currency Sub-total Borrowings Total Apr.1, 2026 ~ Mar. 31, 2027 ₩ 540,000 1,279,968 1,819,968 200,247 2,020,215 Apr.1, 2027 ~ Mar. 31, 2028 500,000 820,131 1,320,131 300,000 1,620,131 Apr.1, 2028 ~ Mar. 31, 2029 585,000 1,059,380 1,644,380 - 1,644,380 Apr.1, 2029 ~ Mar. 31, 2030 120,000 - 120,000 - 120,000 After Apr.1, 2030 1,490,000 151,340 1,641,340 - 1,641,340 Total ₩ 3,235,000 3,310,819 6,545,819 500,247 7,046,066

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 28 13. Provisions Changes in provisions for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 Litigation Restoration cost Others Total Beginning balance ₩ 21,311 116,559 247,710 385,580 Transfer and reclassification - (1,740) (50) (1,790) Usage - (140) (16,983) (17,123) Reversal - (233) - (233) Ending balance ₩ 21,311 114,446 230,677 366,434 Less: Current (21,311) (26,056) (230,412) (277,779) Non-current - 88,390 265 88,655 (in millions of Korean won) 2025 Litigation Restoration cost Others Total Beginning balance ₩ 21,590 125,150 39,732 186,472 Transfer and reclassification 27 399 7,488 7,914 Usage (28) (233) (5,866) (6,127) Reversal - (127) - (127) Ending balance ₩ 21,589 125,189 41,354 188,132 Less: Current (21,589) (31,231) (39,671) (92,491) Non-current - 93,958 1,683 95,641

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 29 14. Net Defined Benefit Liabilities (1) The amounts recognized in the statements of financial position as at March 31, 2026 and December 31, 2025, are determined as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Present value of defined benefit obligations ₩ 1,398,387 1,380,413 Fair value of plan assets (1,342,774) (1,353,253) Liabilities, net ₩ 55,613 27,160 (2) Changes in the defined benefit obligations for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Beginning ₩ 1,380,413 1,344,701 Current service cost 27,404 25,755 Interest expense 12,952 11,347 Benefits paid (22,382) 1,187 Ending ₩ 1,398,387 1,382,990 (3) Changes in the fair value of plan assets for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Beginning ₩ 1,353,253 1,293,619 Interest income 12,697 11,152 Remeasurements on plan assets (1,932) 444 Benefits paid (21,244) (4,330) Ending ₩ 1,342,774 1,300,885 (4) Amounts recognized in the separate statements of profit or loss for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Current service cost ₩ 27,404 25,755 Net interest expense 255 195 Account transfers (3,136) (3,467) Total expenses ₩ 24,523 22,483

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 30 15. Commitments and Contingencies (1) As at March 31, 2026, major Covenants with local financial institutions are as follows: (in millions of Korean won and foreign currencies in thousands) Financial institution Limit Used amount Bank overdraft Kookmin Bank and others ₩ 360,000 - Working capital loan Korea Development Bank and others 1,080,001 100,000 Inter-Korean Cooperation Fund Export-Import Bank of Korea 37,700 247 Economic Cooperation Business Insurance Export-Import Bank of Korea 3,240 1,732 Collateralized loan on electronic accounts receivable-trade Kookmin Bank and others 487,000 28,792 Plus electronic notes payable Industrial Bank of Korea 50,000 - Derivatives transaction limit Korea Development Bank and others USD 1,920,000 USD 1,920,000 Shinhan Bank and others JPY 30,000,000 JPY 30,000,000 Total KRW 2,017,941 130,771 USD 1,920,000 1,920,000 JPY 30,000,000 30,000,000 (2) As at March 31, 2026, guarantees received from financial institutions are as follows: (in millions of Korean won and foreign currencies in thousands) Warranty details Limit Hana Bank Comprehensive credit line ₩ 2,900 USD 8,700 Shinhan Bank Guarantee for payment in foreign currency and others USD 43,301 Guarantee for payment in korean currency 55,010 Kookmin Bank Guarantee for payment in foreign currency USD 3,186 Woori Bank Guarantee for payment in foreign currency USD 5,000 Korea Software Financial Cooperative Advance payment/other guarantee and others 1,153,794 Information & Communication Financial Cooperative Advance payment/other guarantee and others 700,000 Seoul Guarantee Insurance Company Performance guarantee and others 19,187 Total KRW 1,930,891 USD 60,187

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 31 (3) The Company is jointly and severally obligated with KT Sat Co., Ltd. to pay KT Sat Co., Ltd.’s liabilities incurred prior to its spin-off. As at March 31, 2026, the Company and KT Sat Co., Ltd. are jointly and severally liable for reimbursement of ₩ 428 million(as at December 31, 2025: ₩ 428 million). (4) For the three-month period ended March 31, 2026, the Company entered into agreements with Securitization Specialty Companies (2026: First 5G 85th Securitization Specialty Co., Ltd., 2025: First 5G 79th to 84th Securitization Specialty Co., Ltd.) and disposed of its trade receivables related to handset sales. The Company also made asset management agreements with each securitization specialty company and in accordance with the agreement, the Company will receive asset management fees upon liquidation of the securitization specialty company. (5) As at March 31, 2026, the Company is a defendant in 150 lawsuits with a total claimed amount of ₩ 146,230 million (as at December 31, 2025: ₩ 135,528 million). As at March 31, 2026, litigation provisions of ₩ 21,311 million for pending lawsuits and unasserted claims are recorded as liabilities for potential loss in the ordinary course of business. The final outcomes of the cases cannot be estimated as at March 31, 2026 (Note 13). (6) Under the agreement of bond issuance and borrowings, the Company is required to maintain certain financial ratios such as debt-to-equity ratio, use the funds for the designated purpose and report to the creditors periodically. The covenant also contains restrictions on provision of additional collateral and disposal of certain assets. (7) As at March 31, 2026, the Company participates in Algerie Sidi Abdela new town development consortium (percentage of ownership: 2.5%) and has joint liability with other consortium participants. (8) As at March 31, 2026, the agreement amount for the acquisition of property and equipment and intangible assets that are not yet recognized amounts to ₩ 350,544 million (December 31, 2025: ₩ 375,028 million). (9) The Company entered into an agreement with financial investors of Epsilon Global Communications Pte., Ltd. regarding the acquisition of shares contract. If certain conditions are not met in the future as disclosed in the terms and conditions of the agreement, financial investors may exercise the Tag-Along Right and Drag-Along Right, for the convertible preferred shares they hold (Note 6). (10) The Company has an obligation for additional contributions as per agreement to Storm Ventures FUND VII and others. As at March 31, 2026, remaining amounts of USD 25,450 thousand and JPY 160,000 thousand will be invested through the Capital Call method in the future. (11) As at March 31, 2026, the Company has an obligation of ₩ 470,160 million (100%) to provide financial support as an operating investor during the operating period with respect to K Defense Co., Ltd. established in accordance with the Private Investment Act on Social Infrastructure. (12) The Company has an agreement related to a stock sale contract with HYUNDAI MOBIS Co., Ltd. and HYUNDAI MOTOR COMPANY. If the Company intends to dispose of the acquired stocks to a third party after a certain period has elapsed from the date of the contract, HYUNDAI MOBIS Co., Ltd. and HYUNDAI MOTOR COMPANY may exercise a preferential purchase right to designate a buyer with priority. (13) The Company entered into an agreement with equity investors who participated in the equity acquisition contract of kt Cloud Co., Ltd. According to this agreement, if conditions per the agreement are met, the financial investor may exercise a Tag-Along or a Put-Option to the Company in the future. In relation to this contract, the Company

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 32 and the financial investor may settle mutual profits if there is a difference between the final public offering price and the preliminary public offering price (Note 6). (14) As at March 31, 2026, the Company has the obligation to pay minimum guarantees forutilizing product bundling of Tving Co., Ltd., and the right to be paid a certain proportion of the excess as per agreement. (15) As at March 31, 2026, the Company exercised a put option on all of its shares in KT Rwanda Networks Ltd. pursuant to the shareholders’ agreement with the Rwandan government. Following an objection raised by the Rwandan government on the exercise of the put option, an international arbitration proceeding is ongoing at an international arbitration institution located in Mauritius, and the outcome of the arbitration remains uncertain. (16) Details of investment properties provided as collateral as March 31, 2026 and 2025, are as follows: (in millions of Korean won) March 31, 2026 Collateral ₩ Carrying amount Secured amount Related account Related amount Mortgagee Land and buildings 207,228 45,276 Deposit received 38,198 Leaseholders (in millions of Korean won) December 31, 2025 Collateral ₩ Carrying amount Secured amount Related account Related amount Mortgagee Land and buildings 173,280 38,311 Deposit received 30,176 Leaseholders (17) The Company has established supplier finance agreements with some suppliers, and suppliers participating in the supplier finance agreement can receive early payment on invoices sent to the Company from the Company’s external finance provider. The Company pays the finance provider in accordance with the usual payment terms to settle the debt. As at March 31, 2026, all financial liabilities subject to the supplier finance agreement are included in trade and other payables, and the carrying amount is ₩ 5,287 million (December 31, 2025: ₩ 28,500 million). None of this amount has been received by the supplier from the finance provider. There were no significant non- cash changes in the carrying amount of the trade and other payables subject to the Company’s supplier finance agreement. (18) During the prior period, the Company became aware of damages caused by unauthorized small-value payments and security incidents, and is currently under investigation by the Personal Information Protection Commission regarding the timing and circumstances of these incidents. As the investigation is ongoing, the Company cannot reasonably estimate any obligations that may arise in connection with this matter.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 33 16. Leases Information for leases when the Company acts as a lessee is as follows. Information on leases when the Company acts as a lessor is described in Note 9. (1) The separate statements of financial position show the following amounts relating to leases: (in millions of Korean won) March 31, 2026 December 31, 2025 Right-of-use assets Property and buildings ₩ 734,412 735,568 Machinery and communication line facilities 64,877 64,180 Others 10,831 12,495 Total ₩ 810,120 812,243 (in millions of Korean won) March 31, 2026 December 31, 2025 Lease liabilities 1 Current ₩ 281,689 270,725 Non-current 409,840 415,007 Total ₩ 691,529 685,732 1 Included in the line item other current liabilities and non-current liabilities in the separate statements of financial position (Note 8). For the three-month periods ended March 31, 2026 and 2025, right-of-use assets related to leases increased by ₩ 80,921 million and ₩ 83,180 million, respectively. (2) Amounts recognized in the separate statement of profit or loss The separate statement of profit or loss relating to leases for the three-month period March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Depreciation of right-of-use assets Property and buildings ₩ 72,669 73,198 Machinery and communication line facilities 8,287 6,247 Others 2,167 2,529 Total ₩ 83,123 81,974 Interest expense relating to lease liabilities 5,763 6,110 Expense relating to Short-term leases 131 337 Expense relating to leases of low-value assets that are not short-term leases 2,037 1,564 The total cash outflow for leases for the three-month periods ended March 31, 2026 and 2025 is ₩ 86,034 million and ₩ 85,338 million, respectively.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 34 17. Retained Earnings Details of retained earnings as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Legal reserve 1 ₩ 782,249 782,249 Voluntary reserves 2 4,651,362 4,651,362 Unappropriated retained earnings 6,983,839 6,786,249 Total ₩ 12,417,450 12,219,860 1 The Commercial Code of the Republic of Korea requires the Company to appropriate, as a legal reserve, an amount equal to a minimum of 10% of cash dividends paid until such reserve equals 50% of its issued share capital. The reserve is not available for the payment of cash dividends but may be transferred to share capital with the approval of the Company’s Board of Directors or used to reduce accumulated deficits, if any, with the ratification of the Company’s majority shareholders. 2 The reserves of research and development of human resources in other surplus reserves are separately accumulated on disposal of retained earnings on tax filing adjustments when calculating income taxes in accordance with regulations of Tax Reduction and Exemption Control Act of Korea. Reversal of the reserves according to the relevant tax law can be paid out as dividends. 18. Other Components of Equity (1) The Company’s other components of equity as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Treasury stock ₩ (461,077) (461,135) Gain(Loss) on disposal of treasury stock 5 (91) Share-based compensation 9,899 7,119 Other (180,914) (180,915) Total ₩ (632,087) (635,022) (2) As at March 31, 2026 and December 31, 2025, details of treasury stock, are as follows: March 31, 2026 December 31, 2025 Number of shares (in shares) 10,925,239 10,926,622 Amount (in millions of Korean won) ₩ 461,077 461,135 Treasury stock held as at March 31, 2026, is expected to be used for stock compensation for the Company’s directors, employees, and for other purposes.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 35 19. Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities (1) The Company has recognized the following amounts relating to revenue in the separate statement of profit or loss: (in millions of Korean won) 2026 2025 Revenue from contracts with customers ₩ 4,770,226 4,624,966 Revenue from other sources 64,405 57,041 Total ₩ 4,834,631 4,682,007 (2) Operating revenues for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Services provided ₩ 4,069,080 4,044,462 Sales of goods 765,551 637,545 Total ₩ 4,834,631 4,682,007 Revenue from services provided is recognized over time and revenue from sales of goods are recognized at a point in time. (3) The Contract assets, liabilities and deferred revenue recognized in relation to the revenues from contracts with customers, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Contract assets1 ₩ 1,007,234 974,387 Contract liabilities1 234,277 236,748 Deferred revenue2 83,242 82,763 1 The Company recognized contract assets of ₩ 104,117 million and, contract liabilities of ₩ 18,470 million for long-term construction contracts as at March 31, 2026 (as at December 31, 2025: contract assets and liabilities of ₩ 85,712 million and ₩ 26,233 million, respectively). The Company recognizes contract asset as trade receivables and other receivables, and contract liabilities as other current liabilities. 2 Deferred revenue related to government grants is excluded. (4) The contract costs recognized as assets are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Incremental cost of obtaining a contract ₩ 2,059,151 2,024,433 Cost of contract performance 156,558 154,545 Total ₩ 2,215,709 2,178,978 As at March 31, 2026, the Company recognized ₩ 533,199 million (three-month period ended March 31, 2025: ₩ 461,532 million) of operating expenses related to contract cost assets.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 36 (5) For the three-month periods ended March 31, 2026 and 2025, revenue recognized from contract liabilities and deferred revenue carried-forward from prior year, is as follows: (in millions of Korean won) 2026 2025 Revenue recognized from the beginning balance of contract liabilities Allocation of the transaction price ₩ 47,524 52,379 Deferred revenue of joining/installment fees 12,736 11,210 Total ₩ 60,260 63,589 20. Operating Expenses (1) Operating expenses for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Employee benefit cost ₩ 497,026 460,190 Depreciation 593,767 614,857 Depreciation of right-of-use assets 83,123 81,974 Depreciation of intangible assets 119,802 113,653 Commissions 575,436 541,411 Interconnection charges 96,481 97,365 International interconnection fees 40,065 30,940 Purchase of inventories 878,332 626,716 Changes of inventories (79,152) 34,474 Sales promotion expense and sales commissions 687,269 625,476 Service cost 235,415 205,471 Purchase of contents 176,818 174,573 Utilities 93,477 95,197 Taxes and dues 50,536 50,064 Rent 28,437 29,957 Insurance premium 11,208 12,708 Installation fee 123,933 121,059 Advertising expenses 26,830 28,702 Research and development expenses 70,421 80,523 Allowance for bad debts 12,258 11,929 Others 199,221 244,654 Total ₩ 4,520,703 4,281,893 (2) Details of employee benefits for the three-month periods ended March 31, 2026 and 2025, are as follows:

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 37 (in millions of Korean won) 2026 2025 Short-term salaries and wages ₩ 456,927 424,641 Post-employment benefits (defined benefit plan) 24,523 22,483 Post-employment benefits (defined contribution plan) 9,122 9,503 Share-based payment 2,846 1,763 Others 3,608 1,800 Total ₩ 497,026 460,190 21. Other Income and Other Expenses (1) Other income for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Gain on disposal of property and equipment ₩ 17,023 9,782 Gain on disposal of right-of-use assets 205 416 Gain on disposal of intangible assets - 1,641 Compensation on impairment of property and equipment 47,702 17,566 Gain on disposal of investments in subsidiaries, associates and joint ventures - 2,225 Dividends received 68,238 28,083 Income from government subsidies 433 45 Others 3,046 4,836 Total ₩ 136,647 64,594 (2) Other expenses for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Loss on disposal of property and equipment ₩ 25,059 13,018 Loss on disposal of right-of-use assets 191 850 Impairment loss on intangible assets 696 1,298 Donations 6,700 2,660 Others 15,597 9,763 Total ₩ 48,243 27,589

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 38 22. Financial Income and Costs (1) Details of financial income for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Interest income ₩ 46,299 46,600 Gain on foreign currency transactions 3,562 2,525 Gain on foreign currency translation 5,315 6,859 Gain on valuation of derivatives 159,763 5,814 Dividends income 22,038 26,095 Gain on disposal of financial instruments 1,065 - Total ₩ 238,042 87,893 (2) Details of financial costs for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Interest expenses ₩ 52,511 60,524 Loss on foreign currency transactions 2,786 1,608 Loss on foreign currency translation 167,189 2,620 Loss on derivative transactions - 3,724 Loss on valuation of derivatives - 7,183 Loss on disposal of trade receivables 2,539 1,006 Loss on disposal of financial instruments 79 26 Total ₩ 225,104 76,691 23. Income Tax Expense Income tax expense is recognized based on the best estimate of the weighted average annual income tax rate expected for the full financial year. The estimated average annual effective income tax rate used for the year ending December 31, 2026, is 18.1%.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 39 24. Earnings per Share Basic earnings per share for the three-month periods ended March 31, 2026 and 2025, are calculated as follows: (1) Basic Earnings per Share Basic earnings per share is calculated by dividing the profit for the period by the weighted average number of ordinary shares outstanding during the period, excluding ordinary shares held by the Company as treasury stock. 2026 2025 Profit attributable to ordinary shares (in millions of Korean won) ₩ 340,021 365,377 Weighted average number of ordinary shares outstanding (In number of shares) 241,095,985 245,753,391 Basic earnings per share (In Korean won) ₩ 1,410 1,487 (2) Diluted Earnings per Share Diluted earnings per share from operations is calculated by adjusting the weighted average number of ordinary shares outstanding assuming that all dilutive potential ordinary shares are converted into ordinary shares. The Company has dilutive potential ordinary shares from other share-based compensation. Diluted earnings per share represents quarterly net income attributable to each ordinary share and dilutive potential ordinary share. Diluted earnings per share is calculated by dividing adjusted profit for the year by the sum of the number of ordinary shares and dilutive potential ordinary shares. 2026 2025 Profit attributable to ordinary shares (in millions of Korean won) ₩ 340,021 365,377 Diluted profit attributable to ordinary shares (in millions of Korean won) ₩ 340,021 365,377 Number of dilutive potential ordinary shares outstanding (In number of shares) 121,294 101,557 Weighted average number of ordinary shares outstanding (In number of shares) 241,217,279 245,854,948 Diluted earnings per share (in Korean won) ₩ 1,410 1,486

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 40 25. Cash Generated from Operations (1) Cash flows from operating activities for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 1. Profit for the period ₩ 340,021 365,377 2. Adjustments for: Income tax expense 75,249 82,944 Interest income (46,299) (46,600) Interest expense 52,511 60,524 Dividend income (90,276) (54,178) Depreciation 602,134 626,410 Amortization of intangible assets 121,050 114,926 Depreciation of right-of-use assets 83,123 81,974 Post-employment benefits (defined benefits) 27,659 25,950 Impairment losses on trade receivables 15,679 14,578 Gain on disposal of investments in subsidiaries, associates and joint ventures - (2,225) Loss on disposal of property and equipment 8,036 3,236 Loss (gain) on disposal of intangible assets 696 (343) Loss (gain) on disposal of right-of-use assets (14) 434 Loss (gain) on foreign currency translation 161,874 (4,239) Loss (gain) on valuation and settlement of derivatives, net (159,763) 5,093 Loss (gain) on disposal of financial assets at fair value through profit or loss (1,038) 25 Others 14,009 3,162 3. Changes in operating assets and liabilities Increase in trade receivables (215,208) (210,816) Decrease (increase) in other receivables (1,801) 12,539 Increase in other current assets (59,669) (190,275) Decrease (increase) in other non-current assets (94,340) 56,970 Decrease (increase) in inventories (72,111) 59,281 Increase (decrease) in trade payables 302,192 (732) Decrease in other payables (236,643) (115,947) Increase in other current liabilities 38,549 25,788 Increase in other non-current liabilities 2,533 4,896 Increase (decrease) in provisions (16,392) 1,745 Decrease in deferred revenue (4,534) (5,959) Payment of post-employment benefits (defined benefits) (57,644) (200,079) Decrease in plan assets 48,356 184,984 4. Cash generated from operations (1+2+3) ₩ 837,939 899,443

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 41 (2) Significant transactions not affecting cash flows for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 2025 Reclassification of the current portion of borrowings ₩ 1,204,546 509,730 Reclassification of construction-in-progress to property and equipment 418,115 417,573 Change of other payables relating to acquisition of property and equipment (145,353) (316,729) Change of other payables relating to acquisition of intangible assets (272,955) (272,955) Reclassification of other payables from net defined benefit assets (8,150) (20,611) Increase in dividends payable 144,658 122,836

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 42 26. Changes in Liabilities Arising from Financing Activities Details of changes in liabilities arising from financing activities, liabilities related to cashflow to be classified as future financing activities, for the three-month periods ended March 31, 2026 and 2025 are as follows: (in millions of Korean won) 2026 Others Beginning Cash flows Acquisition Changes in FX rate Fair value change Other changes Ending Borrowings ₩ 7,068,705 (211,296) - 164,939 - 2,350 7,024,698 Lease liabilities 685,732 (78,998) 85,742 - - (947) 691,529 Derivative liabilities 13,862 - - - (10,216) - 3,646 Derivative assets (312,334) - - - (161,044) - (473,378) Total ₩ 7,455,965 (290,294) 85,742 164,939 (171,260) 1,403 7,246,495 (in millions of Korean won) 2025 Others Beginning Cash flows Acquisition Changes in FX rate Fair value change Other changes Ending Borrowings ₩ 7,871,919 (189,590) - (5,436) - 3,756 7,680,649 Lease liabilities 759,743 (79,032) 88,900 - - (42,496) 727,115 Derivative assets (442,144) (3,724) - - (18,774) 3,724 (460,918) Total ₩ 8,189,518 (272,346) 88,900 (5,436) (18,774) (35,016) 7,946,846

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 43 27. Related Party Transactions (1) The list of related parties of the Company as at March 31, 2026, is as follows: Relationship Name of Entity Subsidiaries 78 entities including KT Estate Inc., KT Skylife Co., Ltd., BC Card Co., Ltd. Associates and joint ventures 49 entities including K Bank Inc., KIF Investment Fund, Megazone Cloud Corporation, and KIAMCO Data Center Development Real Estate General Private Placement Investment Blind Trusts Others1 Goody Studio Co., Ltd., Rebellion Inc., Digital Pharm Co., Ltd., Mastern No.127 Logispoint Daegu Co., Ltd., KORAMKO No. 143 General Private Real Estate Investment Company and others. 1 Included within the scope of related parties under Korean IFRS 1024 due to the presence of significant influence, even though treated in accordance with Korean IFRS 1109 (2) The amount of the installment handset sales receivable inherited from KTIS Corporation, KTCS Corporation, KT Telecop Co., Ltd., KT M&S Co., Ltd., and in KT Service Nambu Co., Ltd. For three-month period ended March 31, 2026 is ₩ 173,651 million. (3) The Company has entered into an additional agreement in relation to providing wholesale communication services with KT M Mobile Co., Ltd. in connection with the agreement, the Company offsets all or partial receivables against payables for joining mobile telecommunication services and usage of network arising from telecommunication operations.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 44 (4) Outstanding balances of receivables and payables in relation to transaction with related parties as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 Receivables Payables Trade receivables Loans and others Other receivables Trade payables Other payables Lease liabilities Subsidiaries KT Telecop Co., Ltd. ₩ 1,056 - 102 607 30,638 - KTCS Corporation 409 - 9,047 - 55,389 1 KTIS Corporation 9,720 - - - 52,483 - KT Service Bukbu Co., Ltd. 23 - - - 19,018 - KT Service Nambu Co., Ltd. - - - - 39,279 - KT Skylife Co., Ltd. 37,779 - 5,423 10,170 3,863 - KTDS Co., Ltd. 202 - 12,886 - 102,505 - KT Estate Inc. - - 63,764 - 6,721 26,354 KT ENA Co., Ltd. 29 - - - 1,999 - BC Card Co., Ltd. 1 4,367 - 27 - 10,317 5 KT Sat Co., Ltd. 1,356 - - - 1,099 - KT Alpha Co., Ltd. 5,653 - 11,789 - 10,150 - KT Commerce Inc. 3 - 157 803 15,507 17,023 KT M&S Co., Ltd. 167 - 154 - 83,709 - KT GENIE Music Corporation. 4,964 - 3,834 - 14,984 - KT M Mobile Co., Ltd. 55,523 - 10,553 - 5,537 - kt Nasmedia Inc. 1,126 - 3,668 - 27 - KT MOS Bukbu Co., Ltd. 62 - 221 - 11,312 - KT MOS Nambu Co., Ltd. - - 15 - 11,564 - KT Engineering Co., Ltd 949 - 218 205 15,340 - KT Studio Genie Co., Ltd. 56 - 9,232 - 16,599 - kt Cloud Co., Ltd. 14,257 - 40 - 43,891 247 East Telecom LLC 5,258 16,387 - - - - kt netcore Co., Ltd 4,713 - 5 - 85,149 - kt p&m Co., Ltd 39 - 22 - 18,570 - Others 7,924 - 7,763 2,994 14,908 8,850 Associates and joint ventures K Bank Inc. 620 - 4,892 - 24 - Others 1,170 - 7 - 1,867 441 Total ₩ 157,425 16,387 143,819 14,779 672,449 52,921

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 45 (in millions of Korean won) December 31, 2025 Receivables Payables Trade receivables Loans and others Other receivables Trade payables Other payables Lease liabilities Subsidiaries KT Telecop Co., Ltd. ₩ 332 - 499 - 32,573 - KTCS Corporation 275 - 8,840 - 47,296 1 KTIS Corporation 10,647 - - - 46,046 - KT Service Bukbu Co., Ltd. 21 - - - 26,519 - KT Service Nambu Co., Ltd. - - 1 - 40,159 - KT Skylife Co., Ltd. 27,719 - 7,426 - 15,144 - KTDS Co., Ltd. 1,337 - 1,976 - 149,144 - KT Estate Inc. 1 - 42,565 - 28,329 10,283 KT ENA Co., Ltd. 613 - - - 3,020 - BC Card Co., Ltd. 1 4,768 - 6 - 12,509 5 KT Sat Co., Ltd. 1,190 - - - 1,149 - KT Alpha Co., Ltd. 5,827 - 1,312 - 8,568 - KT Commerce Inc. 5 - 121 11,222 21,108 14,907 KT M&S Co., Ltd. 284 - 55 - 49,363 - KT GENIE Music Corporation. - - 12,628 - 22,315 - KT M Mobile Co., Ltd. 57,590 - 58 - 1,283 - kt Nasmedia Inc. 1,727 - 139 - 165 - KT MOS Bukbu Co., Ltd. 62 - 657 - 20,526 - KT MOS Nambu Co., Ltd. - - 60 - 16,301 - KT Engineering Co., Ltd 2,360 - 1 182 74,466 - KT Studio Genie Co., Ltd. 34 - 15,926 - 17,311 - kt cloud Co., Ltd. 13,760 - 16,283 - 92,623 352 East Telecom LLC 5,178 16,010 - - - - kt netcore Co. Ltd 4,911 - 4 - 107,930 - kt p&m Co. Ltd - - - - 17,803 - Others 7,344 - 5,400 2,266 14,552 8,804 Associates and joint ventures K Bank Inc. 695 - 3,348 - - - Others 750 - 7 - 224 553 Total ₩ 147,430 16,010 117,312 13,670 866,426 34,905 1 As at March 31, 2026, the unsettled amount of ₩ 10,316 million (December 31, 2025: ₩ 12,496 million) in credit card transaction with BC Card Co., Ltd. is included in trade payables.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 46 (5) Significant transactions with related parties for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 Sales Purchases Operating revenue Other income Operating expenses Others 1 Acquisition of right-of- use assets Finance income Finance costs Dividends received Subsidiaries KT Telecop Co., Ltd. ₩ 2,729 9 36,161 - - 1 - - KTCS Corporation 1 32,228 10 89,519 155 - - - 318 KTIS Corporation 25,708 2 92,687 - - - - 1,427 KT Service Bukbu Co., Ltd. 1 3,041 - 55,328 555 - - - - KT Service Nambu Co., Ltd. 1 5,291 1 91,270 1,040 - - - - KT Skylife Co., Ltd. 1 41,839 6 4,610 21 - - - 8,368 KTDS Co., Ltd. 1 3,646 4 117,048 6,851 - 14 - 8,256 KT Estate Inc. 1 13,637 3 21,532 455 23,129 - 242 21,790 KT ENA Co., Ltd. 1,418 - 2,264 - - - - - BC Card Co., Ltd. 3,636 6 5,407 - - - - - KT Sat Co., Ltd. 1,310 - 2,645 - - - - - KT Alpha Co., Ltd. 15,541 5 9,518 - - 1 - 9,675 KT Commerce Inc. 1 286 1 12,548 16,675 3,217 - 307 - KT M&S Co., Ltd. 119,687 - 84,782 - - - - - KT GENIE Music Corporation. 118 - 13,894 - - - - - KT M Mobile Co., Ltd. 72,689 18 1,789 - - - - 10,400 KT Nasmedia Co., Ltd. 98 - 252 - - - - 3,487 KT MOS Nambu Co., Ltd. 1 652 7 24,495 753 - - - - KT MOS Bukbu Co., Ltd. 1 976 8 23,929 1,289 - - - - KT Engineering Co., Ltd. 1 853 2 4,872 9,573 - - - - KT HS Corporation 11 - 2,001 - - - - - KT Studio Genie Co., Ltd. 1 130 - 2,090 15,684 - - - - kt Cloud Co., Ltd. 20,338 5 60,196 - - 7 3 - kt netcore Co., Ltd. 1 3,840 6 51,128 65,481 - - 21 - kt p&m Co., Ltd. 1 876 - 16,409 1,451 - - 4 - Others 8,171 694 35,212 202 675 2 25 4,517 Associates and joint ventures K Bank Inc. 1,840 51 45 - - 4 - - Others 1,070 61 929 - - 1 5 - Others Others 1 - - - - - - - Total ₩ 381,660 899 862,560 120,185 27,021 30 607 68,238 1 The amount of acquisition of properties, equipment and others is included.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 47 (in millions of Korean won) 2025 Sales Purchases Operating revenue Other income Operating expenses Others 1 Acquisition of right-of- use assets Finance income Finance costs Dividends received Subsidiaries KT Telecop Co., Ltd. 1 ₩ 2,197 - 36,851 700 - - - - KTCS Corporation 1 30,354 - 85,167 18 - - - 318 KTIS Corporation 21,483 - 85,358 - - - - 1,224 KT Service Bukbu Co., Ltd. 1 3,431 - 53,074 480 - - - - KT Service Nambu Co., Ltd. 1 4,934 4 78,560 1,371 - - - - KT Skylife Co., Ltd. 1 34,209 - 4,105 15 - - - 8,368 KTDS Co., Ltd. 1 3,316 - 101,325 5,654 - - - 6,096 KT Estate Inc. 1 11,281 - 19,041 5 24,658 - 193 6,876 KT ENA Co., Ltd. 1 2,766 - 2,684 1,400 - - - - BC Card Co., Ltd. 2,252 20 6,897 - - - - - KT Sat Co., Ltd. 1,723 - 2,562 - - - - - KT Alpha Co., Ltd. 16,047 - 9,090 - - 1 - - KT Commerce Inc. 1 306 - 20,238 10,494 2,017 - 130 - KT M&S Co., Ltd. 53,661 6 68,051 - - - - - KT GENIE Music Corporation. 113 - 12,385 - - - - - KT M Mobile Co., Ltd. 68,268 26 1,077 - - - - - kt Nasmedia Inc. 55 - 265 - - - - 3,487 KT MOS Nambu Co., Ltd. 1 647 - 23,007 918 - - - - KT MOS Bukbu Co., Ltd. 1 921 - 22,609 584 - - - - KT Engineering Co., Ltd. 1 177 - 7,999 15,545 - - - - KT HS Corporation 5 - 3,476 - - - - - KT Studio Genie Co., Ltd. 1 542 - 2,507 16,961 - - - - kt Cloud Co., Ltd. 19,221 - 54,559 - - - 3 - kt netcore Co., Ltd. 2 829 - 50,207 42,448 - - - - kt p&m Co., Ltd. 2 224 - 10,807 4,501 - - - - Others 3 20,176 13 28,331 811 10 2 - 1,699 Associates and joint ventures K Bank Inc. 2,471 - 2 - - - - - Others 4 619 - 9,379 - - 1 12 - Others Others 1 - - - - - - - Total ₩ 302,229 69 799,613 101,905 26,685 4 338 28,068 1 Amounts include acquisition of property and equipment and others. 2 kt netcore Co., Ltd. and kt p&m Co., Ltd. were established in the fourth quarter of 2024. 3 Transactions with KT Linkus Co., Ltd. and Initech Co., Ltd. before they were excluded from subsidiaries are included. 4 Transactions with Trustay Co., Ltd. before it was excluded from associates and joint ventures are included.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 48 (6) Key management compensation for the three-month periods ended March 31, 2026 and 2025, consists of: (in millions of Korean won) 2026 2025 Short-term benefits ₩ 446 435 Post-employment benefits 70 70 Stock-based compensation 226 183 Total ₩ 742 688 (7) Fund transactions with related parties for the three-month periods ended March 31, 2026 and 2025, are as follows: (in millions of Korean won) 2026 Loan transactions Borrowing transactions1 Loans Collections Borrowings Repayments Equity contributions in cash and others Subsidiaries KT Estate Inc. - - - 6,045 - Others - - 3,217 1,672 - Associates and joint ventures IBK-KT Young Entrepreneurs MARS Investment Fund - - - - 5,000 Solaire IPTV Content Fund - - - - 4,000 Others - - - 77 (3,622) Total ₩ - - 3,217 7,794 5,378 1 Borrowing transactions include lease transactions.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 49 (in millions of Korean won) 2025 Loan transactions Borrowing transactions1 Loans Collections Borrowings Repayments Equity contributions in cash and others Subsidiaries KT M&S Co., Ltd. ₩ 14,700 16,013 - - - KT Estate Inc. - - 58 6,376 - Others - - 2,026 1,272 (1,156) Associates and joint ventures IBK-KT Young Entrepreneurs MARS Investment Fund - - - - 5,000 Others - - - 114 525 Total ₩ 14,700 16,013 2,084 7,762 4,369 1 Borrowing transactions include lease transactions. (8) As at March 31, 2026, the Company has entered into a credit card agreement with a limit of ₩ 22,819 million (December 31, 2025: ₩ 20,824 million) with BC Card Co., Ltd. (9) The Company has an obligation to invest in KIAMCO Data Center Development Real Estate General Private Placement Investment Blind Trusts, a related party, and other entities according to the agreement. As at March 31, 2026, the Company is planning to make an additional investment of ₩ 41,890 million.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 50 28. Fair Value During the period ended March 31, 2026, there have been no significant changes in the business or economic environment that affect the fair value of the Company's financial assets and liabilities. (1) Fair Value by Financial Instruments Category Carrying amount and fair value of financial instruments by category as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 December 31, 2025 Carrying amount Fair value Carrying amount Fair value Financial assets Cash and cash equivalents ₩ 1,268,879 1 1,585,921 1 Trade and other receivables Financial assets measured at amortized cost 3,331,694 1 3,171,002 1 Financial assets at fair value through other comprehensive income 241,952 241,952 107,644 107,644 Other financial assets Financial assets measured at amortized cost 155,507 1 110,465 1 Financial assets at fair value through profit or loss 346,462 346,462 344,938 344,938 Financial assets at fair value through other comprehensive income 2,570,066 2,570,066 2,139,753 2,139,753 Derivative financial assets for hedging purpose 473,378 473,378 312,333 312,333 Total ₩ 8,387,938 7,772,056 Financial liabilities Trade and other payables ₩ 4,156,009 1 4,328,561 1 Borrowings 7,024,698 6,894,502 7,068,705 6,018,495 Other financial liabilities Financial liabilities at fair value through profit or loss 10,359 10,359 10,359 10,359 Derivative financial liabilities for hedging purpose 3,646 3,646 13,862 13,862 Total ₩ 11,194,712 11,421,487 1 The Company did not conduct fair value estimation as the book amount is a reasonable approximation of the fair value.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 51 (2) Fair Value Hierarchy Financial instruments that are measured at fair value are categorized by the fair value hierarchy, and the defined levels are as follows: Level 1: The quoted (unadjusted) price in active markets for identical assets or liabilities that an entity can access at the measurement date. Level 2: All inputs other than quoted prices included in Level 1 that are observable (either directly that is, or indirectly that is, derived from prices) for the asset or liability. Level 3: The unobservable inputs for the asset or liability. Fair value hierarchy classifications of the financial assets and financial liabilities that are measured or disclosed at fair value or its fair value is disclosed as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 Level 1 Level 2 Level 3 Total Assets Trade and other receivables Financial assets at fair value through other comprehensive income ₩ - 241,952 - 241,952 Other financial assets Financial assets at fair value through profit or loss - - 346,462 346,462 Financial assets at fair value through other comprehensive income 2,473,826 - 96,240 2,570,066 Derivative financial assets for hedging - 473,378 - 473,378 Total ₩ 2,473,826 715,330 442,702 3,631,858 Liabilities Borrowings ₩ - 6,894,502 - 6,894,502 Other financial liabilities Financial liabilities at fair value through profit or loss - - 10,359 10,359 Derivative financial liabilities for hedging purpose - 3,646 - 3,646 Total ₩ - 6,898,148 10,359 6,908,507

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 52 (in millions of Korean won) December 31, 2025 Level 1 Level 2 Level 3 Total Assets Trade and other receivables Financial assets at fair value through other comprehensive income ₩ - 107,644 - 107,644 Other financial assets Financial assets at fair value through profit or loss - - 344,938 344,938 Financial assets at fair value through other comprehensive income 2,043,513 - 96,240 2,139,753 Derivative financial assets for hedging - 312,333 - 312,333 Total ₩ 2,043,513 419,977 441,178 2,904,668 Liabilities Borrowings ₩ - 6,018,495 - 6,018,495 Other financial liabilities Financial liabilities at fair value through profit or loss - - 10,359 10,359 Derivative financial liabilities for hedging - 13,862 - 13,862 Total ₩ - 6,032,357 10,359 6,042,716

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 53 (3) Transfers between Fair Value Hierarchy Levels of Recurring Fair Value Measurements 1) Details of transfers between Level 1 and Level 2 of the fair value hierarchy for recurring fair value measurements. There are no transfers between Level 1 and Level 2 of the fair value hierarchy for the recurring fair value measurements. 2) Details of changes in Level 3 of the fair value hierarchy for the recurring fair value measurements. Details of changes in Level 3 of the fair value hierarchy for recurring fair value measurements for the three-month periods ended March 31, 2026 and 2025 are as follows: (in millions of Korean won) 2026 Financial assets Financial liabilities Financial assets at FVTPL Financial assets at FVOCI Financial liabilities at FVTPL Beginning balance ₩ 344,938 96,240 10,359 Acquisition 2,315 - - Disposal (791) - - Ending balance ₩ 346,462 96,240 10,359 (in millions of Korean won) 2025 Financial assets Financial liabilities Financial assets at FVTPL Financial assets at FVOCI Financial liabilities at FVTPL Beginning balance ₩ 456,224 141,015 28 Acquisition 291 - - Transfer - 145 - Disposal (3,009) (145) - Ending balance ₩ 453,506 141,015 28

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 54 (4) Valuation Techniques Valuation techniques and inputs used in the recurring and fair value measurements categorized within Level 2 and Level 3 of the fair value hierarchy as at March 31, 2026 and December 31, 2025, are as follows: (in millions of Korean won) March 31, 2026 Fair value Level Valuation techniques Assets Trade and other receivables Financial assets at fair value through other comprehensive income ₩ 241,952 2 DCF Model Other financial assets Financial assets at fair value through profit or loss 346,462 3 DCF Model, Adjusted Net Asset Model, Backsolve Model, Binomial Option Pricing Model, T-F Model Financial assets at fair value through other comprehensive income 96,240 3 DCF Model, Backsolve Model, T-F Model Derivative financial assets for hedging 473,378 2 DCF Model Liabilities Borrowings ₩ 6,894,502 2 DCF Model Other financial liabilities Financial liabilities at fair value through profit or loss 10,359 3 Binomial Option Pricing Model Derivative financial liabilities for hedging 3,646 2 DCF Model

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 55 (in millions of Korean won) December 31, 2025 Fair value Level Valuation techniques Assets Trade and other receivables Financial assets at fair value through other comprehensive income ₩ 107,644 2 DCF Model Other financial assets Financial assets at fair value through profit or loss 344,938 3 DCF Model, Adjusted Net Asset Model, Backsolve Model, Binomial Option Pricing Model, T-F Model Financial assets at fair value through other comprehensive income 96,240 3 DCF Model, Backsolve Model, T-F Model Derivative financial assets for hedging 312,333 2 DCF Model Liabilities Borrowings ₩ 6,018,495 2 DCF Model Other financial liabilities Financial liabilities at fair value through profit or loss 10,359 3 Binomial Option Pricing Model Derivative financial liabilities for hedging 13,862 2 DCF Model (5) Valuation Processes for Fair Value Measurements Categorized Within Level 3 The Company engages external experts that perform the fair value measurements required for financial reporting purposes. External experts report directly to the chief financial officer (CFO) and discuss valuation processes and results with the CFO in line with the Company’s closing dates.

KT Corporation Notes to the Condensed Separate Interim Financial Statements As at March 31, 2026 and 2025, and December 31, 2025 56 29. Events After the Reporting Period The Company decided on a quarterly dividend at the Board of Directors dated May 12, 2026, and the details are as follows: Type Details Dividend per share ₩ 600 (Total dividend: ₩ 143,863 million) Dividend yield 1.01% Dividend report date May 27, 2026 Dividend pay date June 11, 2026

Source: View Original Filing on SEC EDGAR

FAQ

How did KT (KT) perform financially in the first quarter of 2026?

KT reported operating revenue of ₩6,778,448 million and operating profit of ₩482,701 million for Q1 2026. Profit attributable to owners was ₩352,247 million, lower than ₩539,839 million a year earlier, reflecting weaker margins despite broadly stable revenue.

How strong were KT (KT) cash flows in Q1 2026?

KT generated ₩650,144 million of cash flows from operating activities in Q1 2026. However, investing activities used ₩1,167,819 million and financing activities used ₩131,797 million, driving a net decrease in cash and cash equivalents of ₩646,855 million during the quarter.

What is KT (KT) current financial position in terms of assets, liabilities, and equity?

As of March 31, 2026, KT reported total assets of ₩43,509,992 million and total liabilities of ₩23,516,436 million. Total equity was ₩19,993,556 million, including ₩18,187,708 million attributable to owners and ₩1,805,848 million attributable to non-controlling interests.

How did KT (KT) total comprehensive income change in the first quarter of 2026?

Total comprehensive income for the period was ₩703,027 million, up from ₩573,785 million a year earlier. While profit declined, other comprehensive income improved significantly, mainly from valuation gains on cash flow hedges and financial instruments measured at fair value.

What were KT (KT) borrowings and debt profile as of March 31, 2026?

Total borrowings were ₩10,836,581 million, including a mix of medium-term notes, public bonds, and bank loans in Korean won and foreign currencies. The repayment schedule is spread through periods after March 31, 2027, with sizeable maturities over the next several years.

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KT Corporation (NYSE: KT) Q1 2026 profit drops as capex and investing cash outflows rise

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How did KT (KT) perform financially in the first quarter of 2026?

What were KT (KT) earnings per share for the three months ended March 31, 2026?

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What is KT (KT) current financial position in terms of assets, liabilities, and equity?

How did KT (KT) total comprehensive income change in the first quarter of 2026?

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