SK Telecom (NYSE: SKM) outlines 2025 sustainability report scope and standards

Rhea-AI Filing Summary

SK Telecom Co., Ltd. filed a Form 6-K outlining its “SK Telecom Sustainability Report 2025,” which presents the company’s environmental, social, and governance strategies, activities, and achievements for stakeholders, including investors. The report follows GRI Standards, references KSSB and SASB frameworks, and is assured by DNV Business Assurance Korea.

The reporting period runs from January 1, 2025 to December 31, 2025, with some qualitative updates through May 2026 and four years of quantitative data from 2022 to 2025. The scope primarily covers operations in the Republic of Korea and presents financial data on a consolidated K-IFRS basis. An English version is expected to be posted on the company’s website within July 2026.

Key Figures

Reporting period: January 1, 2025 to December 31, 2025 Historical data span: 2022 to 2025 Revenue concentration in Korea: Over 99% +2 more

5 metrics

Reporting period January 1, 2025 to December 31, 2025 Main period covered by the sustainability report

Historical data span 2022 to 2025 Four years of quantitative data for trend analysis

Revenue concentration in Korea Over 99% Share of SK Telecom revenue generated in the Republic of Korea

Submission date June 30, 2026 Date the Form 6-K was submitted

English report timing Within July 2026 Expected posting of English version on corporate website

Key Terms

GRI Standards, KSSB Sustainability Disclosure Standard, SASB, K-IFRS, +1 more

5 terms

GRI Standards financial

"The Report has been prepared in accordance with the requirements of the GRI Standards, the sustainability reporting standards of the Global Reporting Initiative"

A set of international guidelines for how organizations report environmental, social and governance (ESG) information, the GRI Standards act like a common recipe that helps companies consistently disclose their impacts on people and the planet. Investors use these reports to compare sustainability-related risks and opportunities across companies, much like using a standardized checklist to judge different products, which improves transparency and helps inform long-term investment decisions.

KSSB Sustainability Disclosure Standard financial

"It also references KSSB Sustainability Disclosure Standard No. 1 (General Requirements for Disclosure of Sustainability-Related Financial Information), No. 2 (Climate-Related Disclosure)"

SASB financial

"as well as relevant standards such as SASB"

SASB stands for the Sustainability Accounting Standards Board, an organization that created industry-specific guidelines for companies to report environmental, social and governance factors that are likely to affect their financial performance. Think of it as a standardized checklist that helps investors compare how well different companies manage risks like pollution, labor practices or product safety — similar to using a common recipe so you can fairly judge different cooks. Clear, consistent SASB disclosures make it easier for investors to spot hidden risks and long-term value drivers.

K-IFRS financial

"Financial data included in the Report are presented on a consolidated basis in accordance with the Korean International Financial Reporting Standards (“K-IFRS”)"

Materiality Assessment financial

"Appendix - Materiality Assessment, Stakeholder Engagement, Financial Statements, Non-Financial Statements"

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Available on EDGAR 06/30/2026 - 07:33 AM Accepted by SEC EDGAR 06/30/2026 - 07:32 AM Learn about SEC filing dates

UNITED STATES

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 JUNE 2026

Commission File Number: 333-04906

SK Telecom Co., Ltd.

(Translation of registrant’s name into English)

65, Euljiro, Jung-gu

Seoul 04539, Korea

(Address of principal executive office)

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 ☐

Matters Relating to Corporate Sustainability Report of SK Telecom Co., Ltd. (the “Company”)

1. Title of the Report		“SK Telecom Sustainability Report 2025” (the “Report”)
2. Certifying Institution		DNV Business Assurance Korea
3. Reporting Standards		The Report has been prepared in accordance with the requirements of the GRI Standards, the sustainability reporting standards of the Global Reporting Initiative (GRI). It also references KSSB Sustainability Disclosure Standard No. 1 (General Requirements for Disclosure of Sustainability-Related Financial Information), No. 2 (Climate-Related Disclosure), as well as relevant standards such as SASB.
4. Filing Location		The Company’s corporate website (https://www.sktelecom.com/esg/lib/persist.do)
5. Details of the Report		1. Summary The Report is SK Telecom’s Sustainability Report, published to share the company’s sustainability management strategies, key activities, and achievements across environmental, social, and governance (ESG) areas with a wide range of stakeholders, including investors. 2. Reporting Period The reporting period for this report is from January 1, 2025 to December 31, 2025. Some qualitative activities are included up to May 2026. For quantitative data, four years of data from 2022 to 2025 are presented to enable year-on-year trend analysis. In cases where significant changes have occurred in previously reported data, past data have been recalculated based on 2025 and reflected accordingly. 3. Scope of the Report The geographical boundary of the Report is limited to the Republic of Korea, where over 99% of SK Telecom’s revenue is generated and its main business sites are located. Unless otherwise specified, data from SK Telecom’s overseas branches, subsidiaries, and affiliates are excluded from general descriptions and information. Financial data included in the Report are presented on a consolidated basis in accordance with the Korean International Financial Reporting Standards (“K-IFRS”), including K-IFRS No. 16, which has been applied since 2019. Non-financial data on environmental performance and fulfillment of corporate social responsibility are presented on a non-consolidated basis. 4. Table of Contents Business Overview -   CEO Message, Business Overview, Sustainability Management Directions Special Report -   From the Customer, By the Customer Material Topics -   Information Security & Personal Data Protection, Technological Innovation, Climate Change Response

		ESG Management -   Environmental: Environmental Management, Natural Capital, Circular Economy -   Social: Employees, Health & Safety, Human Rights Management, Customer-Centric Management, Network Stability, Supply Chain Management, Community Engagement -   Governance: Corporate Governance, Ethical Management, Compliance, AI Governance, Risk Management Appendix -   Materiality Assessment, Stakeholder Engagement, Financial Statements, Non-Financial Statements, Index, About This Report
6. Submission Date		June 30, 2026
7. Other Important Matters Relating to an Investment Decision		The English version of the Report is expected to be posted on the Company’s corporate website within July 2026.

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.

SK TELECOM CO., LTD.
(Registrant)
By:		/s/ Taehee Kim
(Signature)
Name:		Taehee Kim
Title:		Vice President

Date: June 30, 2026

FAQ

What is SKM’s SK Telecom Sustainability Report 2025 about?

The report explains SK Telecom’s sustainability management strategies, activities, and achievements across environmental, social, and governance areas. It targets a wide range of stakeholders, including investors, and summarizes how the company manages key ESG topics and discloses related performance over multiple years.

What period does SK Telecom (SKM) Sustainability Report 2025 cover?

The report covers January 1, 2025 to December 31, 2025 as its main reporting period. It also includes some qualitative activities up to May 2026 and presents four years of quantitative data from 2022 to 2025 for year-on-year trend analysis.

Which reporting standards does SK Telecom (SKM) use in its 2025 sustainability report?

The report is prepared in accordance with GRI Standards, the Global Reporting Initiative framework. It also references KSSB Sustainability Disclosure Standards No. 1 and No. 2, as well as relevant SASB standards, to structure sustainability-related financial and climate disclosures.

What is the geographic and data scope of SK Telecom (SKM) Sustainability Report 2025?

The geographic scope is limited to the Republic of Korea, where over 99% of SK Telecom’s revenue is generated. Financial data are presented on a consolidated K-IFRS basis, while environmental and social data are generally presented on a non-consolidated basis.

Where can investors access SK Telecom (SKM) Sustainability Report 2025?

The report is available on SK Telecom’s corporate website in the ESG section. The filing states that an English version of the report is expected to be posted on the company’s website within July 2026, providing broader accessibility for international investors.

Which ESG topics does SK Telecom (SKM) highlight in its 2025 sustainability report?

Key ESG topics include information security and personal data protection, technological innovation, climate change response, environmental management, human rights, supply chain management, AI governance, and risk management. The report also covers community engagement, network stability, and overall corporate governance practices.