UMC (NYSE: UMC) converts exchangeable bonds into Novatek shares

Rhea-AI Filing Summary

United Microelectronics Corporation reported the disposal of common shares of Novatek Microelectronics Corporation through conversion of zero coupon exchangeable bonds due 2026. Between 2026/06/17 and 2026/06/18, it traded 2,896,036 shares at an average price of $479.8 NTD, for total proceeds of $1,389,518,072 NTD.

The company recorded an impact on retained earnings of $1,007,168,830 NTD, with no impact on net income. After this transaction, it held a cumulative 12,373,857 Novatek shares, amounting to 2.03% of Novatek’s shares, with no restrictions on rights.

Key Figures

Novatek shares disposed: 2,896,036 shares Average unit price: $479.8 NTD per share Total transaction amount: $1,389,518,072 NTD +5 more

8 metrics

Novatek shares disposed 2,896,036 shares Trading volume during 2026/06/17–2026/06/18

Average unit price $479.8 NTD per share Average price for disposed Novatek shares

Total transaction amount $1,389,518,072 NTD Value of Novatek shares disposed in this event

Retained earnings impact $1,007,168,830 NTD Recorded effect from the disposal; no net income impact

Cumulative Novatek holdings 12,373,857 shares Holdings after transaction, representing 2.03% stake

Net worth per Novatek share $118.2 NTD Net worth per share of the underlying securities

Securities vs total assets 41.91% Ratio of securities investment to total assets

Working capital $44,980,640 thousand NTD Operational capital from most recent financial statement

Key Terms

zero coupon exchangeable bonds, retained earnings, net worth per share, securities investment, +1 more

5 terms

zero coupon exchangeable bonds financial

"Shares Conversion of zero coupon exchangeable bonds due 2026"

retained earnings financial

"Impact on retained earnings: $1,007,168,830 NTD."

Retained earnings are the cumulative portion of a company's profits that management keeps instead of distributing to shareholders as dividends; they appear on the balance sheet as part of owners’ value. For investors, retained earnings matter because they act like a company’s savings account—funding growth, paying down debt, or supporting future dividends—and their size and changes reveal how profitable the business has been and how management chooses to use those profits.

net worth per share financial

"Net worth per share of the Company’s underlying securities acquired or disposed of: $118.2 NTD"

securities investment financial

"Current ratio of securities investment ... to the total assets and equity"

related party financial

"Whether the counterparty of the current transaction is a related party: No"

A related party is a person or organization with close ties to a company — for example major shareholders, board members, executives, their family, or businesses they control — that can influence decisions or enter into transactions with the company. Investors watch related‑party dealings because they can create conflicts of interest or non‑market terms that affect fairness, the company’s finances and transparency; think of it like buying or selling something to a family member rather than on the open market.

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

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN ISSUER

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

OF THE SECURITIES EXCHANGE ACT OF 1934

June 18, 2026

(Commission File Number: 001-15128)

United Microelectronics Corporation

(Translation of registrant’s name into English)

No. 3 Li-Hsin 2nd Road,

Hsinchu Science Park,

Hsinchu, Taiwan, R.O.C.

(Address of principal executive office)

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

Form 20-F  Form 40-F 

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101 (b) (1): 

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101 (b) (7): 

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, thereto duly authorized.

United Microelectronics Corporation
By:	Chitung Liu
Name:	Chitung Liu
Title:	CFO

Date: June 18, 2026

2

EXHIBIT INDEX

Exhibit		Description
99.1		6K on 06/18/2026

3

www.umc.com

Exhibit

Exhibit Description

99.1 Announcement on 2026/06/18: To announce related materials on disposal of Novatek Microelectronics Corporation securities

Exhibit 99.1

To announce related materials on disposal of Novatek Microelectronics Corporation securities

1. Name and nature of the underlying assets (if preferred shares, the terms and conditions of issuance shall also be indicated, e.g., dividend yield, etc.):

Common shares of Novatek Microelectronics Corporation

2. Date of occurrence of the event: 2026/06/17~2026/06/18

3. Date of the board of directors’ resolution: NA

4. Other approval date:

Approval level: NA

2026/06/18

5. Amount, unit price, and total monetary amount of the transaction:

trading volume: 2,896,036 shares;

average unit price: $479.8 NTD;

total amount: $1,389,518,072 NTD

6. Trading counterparty and its relationship with the Company (if the trading counterparty is a natural person and furthermore is not a related party of the Company, the name of the trading counterparty is not required to be disclosed):

Shares Conversion of zero coupon exchangeable bonds due 2026

7. Where the trading counterparty is a related party, announcement shall also be made of the reason for choosing the related party as trading counterparty and the identity of the previous owner, its relationship with the Company and the trading counterparty, and the previous date and monetary amount of transfer: NA

8. Where an owner of the underlying assets within the past five years has been a related party of the Company, the announcement shall also include the date and price of acquisition and disposal by the related party, and its relationship with the Company at the time of the transaction: NA

9. Matters related to the current disposal of creditors' rights (including types of collaterals of the disposed creditor’s rights; if creditor’s rights over a related party, announcement shall be made of the name of the related party and the book amount of the creditor's rights, currently being disposed of, over such related party): NA

10. Profit or loss from the disposal (not applicable in cases of acquisition of securities) (those with deferral should provide a table explaining recognition):

Impact on retained earnings: $1,007,168,830 NTD. (No impact to net income)

11. Terms of delivery or payment (including payment period and monetary amount), restrictive covenants in the contract, and other important terms and conditions:

Shares Conversion of zero coupon exchangeable bonds due 2026

12. The manner of deciding on this transaction (such as invitation to tender, price comparison, or price negotiation), the reference basis for the decision on price, and the decision-making unit:

Based on the offering memorandum

13. Net worth per share of the Company’s underlying securities acquired or disposed of: $118.2 NTD

14. Cumulative no. of shares held (including the current transaction), their monetary amount, shareholding percentage, and status of any restriction of rights (e.g., pledges), as of the present moment:

cumulative volume: 12,373,857 shares;

amount: $5,980,931,747 NTD;

percentage of holdings: 2.03%;

status of any restriction of rights: None

15. Current ratio of securities investment (including the current trade, as listed in article 3 of Regulations Governing the Acquisition and Disposal of Assets by Public Companies) to the total

assets and equity attributable to owners of the parent as shown in the most recent financial statement and working capital as shown in the most recent financial statement as of the present:

ratio of total assets: 41.91%;

ratio of shareholder’s equity: 57.37%;

the operational capital as shown in the most recent financial statement: $44,980,640 thousand NTD

16. Broker and broker’s fee: None

17. Concrete purpose or use of the acquisition or disposal:

Shares Conversion of zero coupon exchangeable bonds due 2026

18. Any dissenting opinions of directors to the present transaction: NA

19. Whether the counterparty of the current transaction is a related party: No

20. Date of ratification by supervisors or approval by the Audit Committee: NA

21. Whether the CPA issued an unreasonable opinion regarding the current transaction: NA

22. Name of the CPA firm: NA

23. Name of the CPA: NA

24. Practice certificate number of the CPA: NA

25. Whether the transaction involved in change of business model: No

26. Details on change of business model: NA

27. Details on transactions with the counterparty for the past year and the expected coming year: NA

28. Source of funds: NA

29. Date on which material information regarding the same event has been previously released: NA

30. Any other matters that need to be specified: None

FAQ

What securities did UMC (UMC) dispose of in this transaction?

UMC disposed of common shares of Novatek Microelectronics Corporation. The transaction involved Novatek’s ordinary shares, which UMC held via zero coupon exchangeable bonds due 2026 that were converted into shares as part of the disposal process described in the announcement.

How large was UMC’s Novatek share disposal in June 2026?

UMC disposed of 2,896,036 Novatek shares between 2026/06/17 and 2026/06/18. The average unit price was $479.8 NTD per share, resulting in a total transaction amount of $1,389,518,072 NTD for this specific disposal period.

What was the financial impact of UMC’s Novatek share disposal on retained earnings?

The disposal increased retained earnings by $1,007,168,830 NTD. The company explicitly noted this impact on retained earnings while stating there was no impact on net income, indicating the effect was recorded directly within equity rather than through the income statement.

What is UMC’s remaining stake in Novatek after this transaction?

After the transaction, UMC held 12,373,857 Novatek shares. These shares had an aggregate amount of $5,980,931,747 NTD and represented a 2.03% shareholding percentage, with no restrictions on rights such as pledges reported in the disclosure.

How does this securities investment compare to UMC’s total assets and equity?

UMC’s securities investments equaled 41.91% of total assets. They also represented 57.37% of shareholders’ equity, based on the most recent financial statements. The company reported operational capital of $44,980,640 thousand NTD alongside these ratios.

Did UMC use a broker or pay fees for this Novatek share disposal?

No broker or broker’s fee was reported. The disclosure states that there was no broker and no brokerage fee for the transaction, and the pricing was based on the offering memorandum related to the zero coupon exchangeable bonds due 2026.

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EX-99.1 23.6 KB