【ASE Technology Holding】Announcement on Board Resolution by Subsidiary ASE Semiconductor Manufacturing Co., Ltd. to Increase Capital in Subsidiary ASE Electronics (M) Sdn. Bhd.

1. Name and nature of the target (for preferred shares, issuance conditions such as dividend rate should also be specified): Shares of ASE Electronics (M) Sdn. Bhd. (hereinafter referred to as "ASEM") 2. Date of occurrence of the event: 2026/4/15~2026/4/15 3. Date of board approval: April 15, 2026 4. Other approval dates: Not applicable 5. Quantity of transactions, price per unit, and total transaction amount: Total transaction amount: US$120,000,000 (approximately NT$3,839,400,000) 6. Counterparty to the transaction and its relationship with the company (if the counterparty is a natural person and not a related party of the company, disclosure of their name may be exempted): ASEM is a 100% owned subsidiary of ASE Semiconductor Manufacturing Co., Ltd. (hereinafter referred to as "ASE Semiconductor") 7. If the counterparty is a related party, the reason for selecting the related party as the transaction object, the previous owner, the relationship between the previous owner and the company and the counterparty, the previous transfer date, and the transfer amount should also be disclosed: Reason for selecting a related party as the transaction object: To fund ASEM's acquisition of Analog Devices Sdn. Bhd. shares Previous transfer related information: Not applicable 8. If the owner of the transaction target has been a related party of the company within the past five years, the date of acquisition and disposal by the related party, price, and its relationship with the company at the time of the transaction should also be disclosed: Not applicable 9. Matters related to the disposal of receivables (including the type of collateral attached to the disposed receivables, if the disposed receivables are against related parties, the name of the related party and the book value of the receivables against that related party should also be disclosed): Not applicable 10. Gains (or losses) on disposal (not applicable to the acquisition of marketable securities) (if deferred, a list should be provided to explain recognition status): Not applicable 11. Delivery or payment terms (including payment period and amount), contractual restrictions, and other important agreements: Delivery or payment terms: To be processed by cash capital increase after obtaining approval from the Investment Commission, Ministry of Economic Affairs. Contractual restrictions and other important agreements: None 12. Method of determining this transaction, reference basis for price determination, and decision-making unit: Method of determining this transaction and decision-making unit: Based on the resolution of the board of directors of ASE Semiconductor Reference basis for price determination: Total price for ASEM's acquisition of Analog Devices Sdn. Bhd. shares 13. Net value per share of the target company for acquisition or disposal of marketable securities: Not applicable 14. As of now, the cumulative quantity, amount, shareholding ratio, and restrictions on rights (e.g., pledge status) of this transaction security (including this transaction): ASE Semiconductor directly holds 100% equity in ASEM, total transaction amount US$307,894,266 (approximately NT$9,851,077,041); no rights restricted. 15. As of now, the proportion of investment in marketable securities listed in Article 3 of the "Regulations Governing the Acquisition and Disposal of Assets by Public Companies" (including this transaction) to the total assets and owners' equity attributable to the parent company in the latest financial report, and the working capital amount in the latest financial report (Note 2): Proportion of total assets: 46.92% Proportion of owners' equity attributable to the parent company: 56.91% Working capital: NT$-3,568,201 thousand 16. Broker and brokerage fees: Not applicable 17. Specific purpose or use of acquisition or disposal: To meet ASEM's funding needs 18. Opinions of dissenting directors for this transaction: Not applicable 19. This transaction is a related party transaction: Yes 20. Date of approval by supervisors or audit committee: April 15, 2026 21. The accountant issued an unreasonable opinion on this transaction: Not applicable 22. Name of accounting firm: Not applicable 23. Name of accountant: Not applicable 24. Accountant's practicing certificate number: Not applicable 25. Whether it involves changes in operating model: No 26. Explanation of changes in operating model: Not applicable 27. Transaction status with the counterparty in the past year and expected in the next year: None 28. Source of funds: Company's own funds 29. Date of previous material information announcement for the same event: Not applicable 30. Other matters to be specified: None