ASE Technology Holding: Announcement by Subsidiary Taiwan Fore Technology Co., Ltd. on the Disposal of MediaTek Inc. Securities

1. Name of securities: Common shares of MediaTek Inc. 2. Transaction dates: 2026/4/22 ~ 2026/5/6 3. Date of board resolution: Not applicable 4. Other approval dates: Approval level: CFO May 6, 2026 5. Transaction volume, unit price, and total transaction amount: Transaction volume: 143,000 common shares Unit price: NT$2,648.32 Total transaction amount: NT$378,710,000 6. Disposal gains (or losses) (not applicable for acquisition of securities): Disposal gains: NT$175,262,470 7. Relationship with the target company of the transaction: None 8. As of present, the cumulative quantity, amount, shareholding ratio, and restricted rights (e.g., pledged status) of these securities (including this transaction): Cumulative quantity of these securities: 60,000 shares Cumulative amount of these securities: NT$85,362,600 Cumulative shareholding ratio of these securities: 0.00374% Restricted rights: None 9. As of present, the proportion of investment in securities (including this transaction) listed in Article 3 of the "Regulations Governing the Acquisition and Disposal of Assets by Public Companies" to the total assets and owners' equity attributable to the parent company in the latest financial statements, and the amount of working capital in the latest financial statements: Proportion of total assets: 4.05% Proportion of owners' equity attributable to the parent company: 4.92% Working capital: NT$-3,568,201 thousand 10. Specific purpose of acquisition or disposal: Realization of investment income 11. Opinions of dissenting directors on this transaction: Not applicable 12. This transaction is a related party transaction: No 13. Counterparty and its relationship with the company: Not applicable 14. Date of approval by supervisors or audit committee: Not applicable 15. Date of previous significant announcement on the same event: Not applicable 16. Other matters to be specified: None.