Walsin Lihwa Announces Board Approval for Cash Capital Increase in Luxembourg Subsidiary Walsin Lihwa Europe S.a r.l.

1. Name and nature of the subject matter (if preferred shares, specify issuance terms such as dividend rate): Equity of Walsin Lihwa Europe S.a r.l.

2. Date of occurrence: June 29, 2026 ~ June 29, 2026

3. Board approval date: June 29, 2026

4. Other approval dates: Not applicable

5. Transaction quantity, unit price, and total transaction amount: (1) Number of units: Not applicable (2) Unit price: Not applicable (3) Total transaction amount: EUR 30,000 thousand

6. Counterparty and its relationship with the company (if the counterparty is a natural person and not a related party, name disclosure may be omitted): (1) Counterparty: Walsin Lihwa Europe S.a r.l. (2) Relationship with the company: Walsin Lihwa Europe S.a r.l. is a direct 100%-owned subsidiary of the company

7. If the counterparty is a related party, state the reason for selecting them, previous transferor, relationships among previous transferor, company, and counterparty, transfer date, and amount: Not applicable (cash capital increase)

8. If the ownership of the subject asset was held by a related party of the company within the past five years, disclose the acquisition and disposal dates, prices, and relationship with the company at the time: Not applicable

9. Matters related to the disposal of receivables (including types of collateral attached to disposed receivables; if receivables from related parties are involved, disclose the names and book amounts): Not applicable

10. Gain (or loss) on disposal (not applicable for acquisition of securities) (if deferred, explain recognition in table form): Not applicable

11. Delivery or payment terms (including payment schedule and amounts), contractual restrictions, and other important agreements: (1) Delivery or payment terms: In accordance with capital increase schedule (2) Contractual restrictions and other important terms: None

12. Transaction decision method, pricing reference basis, and decision-making unit: (1) Transaction decision method and pricing reference: Cash capital increase (2) Decision-making unit: Board of Directors

13. Net asset value per share of the securities-issuing company (if applicable): Not applicable

14. Cumulative holdings of the securities involved in this transaction (including this transaction) to date, including quantity, amount, ownership percentage, and any restricted rights (e.g., pledge status): (1) Quantity: 12,000 shares (2) Amount: TWD 15,685,150 thousand (3) Ownership percentage: 100% (4) Rights restriction status: None

15. Proportion of securities investments (including this transaction) under Article 3 of the 'Asset Acquisition and Disposal Rules for Publicly Issued Companies' to total assets and equity attributable to owners of the parent in the company's latest financial statements, and the amount of working capital in the latest financial statements: (1) Proportion to total assets: 87.09% (2) Proportion to shareholders' equity: 116.84% (3) Working capital amount: TWD 1,858,227 thousand

16. Broker and brokerage fees: None

17. Specific purpose or use of the acquisition or disposal: To meet funding requirements in the European region

18. Dissenting directors' opinions on this transaction: None

19. Whether this transaction is a related-party transaction: Yes

20. Date of auditor approval or audit committee consent: June 29, 2026

21. Whether the accountant issued a non-reasonableness opinion on this transaction: Not applicable

22. Name of accounting firm: Not applicable

23. Name of accountant: Not applicable

24. Accountant's license number: Not applicable

25. Whether it involves a change in business model: No

26. Explanation of business model change: Not applicable

27. Transaction history with the counterparty in the past year and expected in the next year: Not applicable

28. Source of funds: Not applicable

29. Previous date of material information disclosure regarding the same event: Not applicable

30. Other explanatory matters: None