First Financial Holding: Subsidiary First Securities Announces Proposed Acquisition of First Commercial Bank's 2026 1st Tranche Unsecured Senior Financial Bonds

1. Name and nature of the subject matter (for preferred shares, specify the agreed issuance conditions, such as dividend rate): First Commercial Bank Co., Ltd. 2026 1st Tranche Unsecured Senior Financial Bonds

2. Date of occurrence: 115/6/8 ~ 115/6/8

3. Board approval date: June 8, 2026 (ROC calendar 115)

4. Other approval dates: Not applicable

5. Transaction quantity, unit price, and total amount: Transaction quantity: Up to 90 units Unit price: Face value of NT$10 million per unit Total amount: Up to NT$900 million

6. Counterparty and its relationship with the company (if the counterparty is a natural person and not a related party, disclosure of name may be omitted): Counterparty: First Commercial Bank Co., Ltd. Relationship with the company: The company and First Commercial Bank are both subsidiaries of First Financial Holding Co., Ltd.

7. If the counterparty is a related party, disclose the reason for selecting the related party as the transaction counterparty, the previous owner, the relationship between the previous owner and the company and the counterparty, the previous transfer date, and the transfer amount: The company intends to serve as a financial advisor for the offering and issuance of First Commercial Bank Co., Ltd. 2026 1st Tranche Unsecured Senior Financial Bonds

8. If the subject matter has been owned by a related party of the company within the last five years, disclose the date and price of acquisition and disposal by the related party, and the relationship with the company at the time of transaction: Not applicable

9. Matters related to the disposal of claims (including the type of collateral attached, and if the claim is against a related party, disclose the related party's name and the book value of the claim): Not applicable

10. Gain or loss on disposal (not applicable for acquisition of securities; if deferred, list the recognition status): Not applicable

11. Delivery or payment terms (including payment period and amount), contractual restrictions, and other important terms: Delivery or payment terms: Lump sum payment on settlement date Contractual restrictions and other important terms: None

12. Decision method, price determination basis, and decision authority for this transaction: Decision method: Negotiation Price determination basis: Based on market price of similar instruments Decision authority: According to the company's approval authority

13. Net asset value per share of the company whose securities are acquired or disposed: Not applicable

14. Cumulative amount, quantity, shareholding ratio, and any restrictions on rights (e.g., pledges) of the transaction securities held to date (including this transaction): Quantity: Up to 90 units Amount: Up to NT$900 million Restrictions on rights: None

15. Proportion of securities investments (including this transaction) as defined in Article 3 of the "Regulations Governing the Acquisition and Disposal of Assets by Public Companies" to the total assets and equity attributable to parent company owners in the latest financial statements, and working capital in the latest financial statements: As a percentage of financial holding: 0.17%, 0.30%, working capital: Not applicable As a percentage of the company: 1.62%, 9.17%, working capital: NT$8,081,336,000

16. Broker and broker fees: Not applicable

17. Specific purpose or use of acquisition or disposal: To serve as a financial advisor

18. Opinions of directors dissenting to this transaction: None

19. Is this transaction a related-party transaction: Yes

20. Approval date by supervisor or audit committee: June 8, 2026 (ROC calendar 115)

21. Does the certified public accountant issue a non-reasonableness opinion: Not applicable

22. Name of accounting firm: Not applicable

23. Name of certified public accountant: Not applicable

24. CPA license number: Not applicable

25. Whether the transaction involves a change in business model: No

26. Explanation of business model change: Not applicable

27. Transactions with the counterparty in the past year and expected in the coming year: Past year: Disclosed and reported as per regulations Coming year: Subject to market conditions and the company's future strategy

28. Source of funds: Working capital

29. Date of previous material information announcement for the same event: Not applicable

30. Other explanatory matters: None