YenChau: Announcement of the company's disposal of securities

1. Name of securities: MediaTek Inc. 2. Transaction date: 2024/12/19~2026/05/15 3. Date of board of directors' approval: Not applicable 4. Other approval date: Approval level: Handled according to company's authorization limits May 15, 2026 5. Transaction quantity, unit price, and total transaction amount: Transaction quantity: 127,000 shares Unit price: NT$2,549.58 Total transaction amount: NT$323,796,204 6. Disposal gain (or loss) (not applicable to acquisition of securities): Disposal of financial assets measured at fair value through other comprehensive income, recognized cumulative earnings: NT$160,700,631 7. Relationship with the target company of the transaction: None 8. As of now, the cumulative quantity, amount, shareholding ratio, and pledge status (e.g., pledged shares) of these securities (including this transaction): Cumulative holding quantity: 121,000 shares Amount: NT$157,014,460 Shareholding ratio: 0% Pledge status: 59,000 shares 9. As of now, the ratio 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 company's most recent financial report's total assets and equity attributable to owners of the parent, and the amount of working capital in the most recent financial report: Ratio to total assets: 10.18% Ratio to equity attributable to owners of the parent: 22.94% Working capital amount: NT$6,841,122 thousand 10. Specific purpose of acquisition or disposal: Realizing investment 11. Opinions of dissenting directors on this transaction: None 12. Is this transaction a related party transaction: No 13. Transaction counterparties and their relationship with the company: Not applicable 14. Date of supervisors' approval or audit committee's consent: Not applicable 15. Date of previous material information disclosure on the same event: Not applicable 16. Other matters that need to be specified: None Keywords: Material Information