1459 MediaTek Announces Cash Reduction Share Exchange Benchmark Date and Issuance Plan (Correction of Last Transfer Date for Reduced Shares)

Announcement Date: June 25, 2026 Statement Date: June 24, 2026 Statement Time: 16:36:57 Company Code: 1459 Company Name: MediaTek Subject: The Chairman has established the benchmark date for cash reduction share exchange and related matters of the share issuance plan (correction of the last transfer date for reduced shares) Applicable Clause: Item 11 Factual Date: June 24, 2026 Explanation: 1. Board Resolution Date: NA 2. Capital Reduction Benchmark Date: 115/06/11 3. Share Issuance Plan for Cash Reduction: The company is conducting a cash reduction to return capital to shareholders in order to adjust its capital structure and improve return on equity. This action was approved at the annual shareholders’ meeting on May 12, 2026, and has been officially recognized by the Taiwan Stock Exchange Corporation under Letter No. 1150009252 dated June 4, 2026, and registered with the Ministry of Economic Affairs under Letter No. 11530091040 dated June 16, 2026. Accordingly, this issuance plan is established in accordance with the "Operating Rules of the Taiwan Stock Exchange Corporation" and the "Procedures for Issuing Securities by Listed Companies on the Taiwan Stock Exchange Corporation." Details of the share issuance related to this capital reduction are as follows:

I. Securities Name, Number of Shares, Par Value per Share, and Total Amount for the Cash Reduction Share Issuance: (i) Name of Issued Securities: MediaTek Textile Fiber Co., Ltd. Ordinary Shares. (ii) Total Number of Issued Shares: Includes all previously issued shares, totaling 358,628,907 ordinary shares, with a par value of NT$10 per share, amounting to NT$3,586,289,070. (iii) Total Number and Amount of Reduced Shares: A total of 89,657,227 issued shares will be canceled, reducing capital by NT$896,572,270. (iv) Reduction Ratio: As stipulated by Article 168 of the Company Act, capital reduction shall be proportionate to shareholders’ holdings. The reduction ratio is 25%, meaning 250 shares will be reduced for every 1,000 shares held, and 750 new shares will be issued per 1,000 shares. (v) Cash Refund per Share: NT$2.5 per share will be refunded in cash, with amounts below NT$1 rounded down. (vi) Total Number and Amount of Shares After Reduction: After reduction, 268,971,680 shares will be outstanding, with a par value of NT$10 per share, resulting in a total paid-in capital of NT$2,689,716,800. (vii) The new shares issued through this capital reduction will be calculated based on each shareholder’s holdings as recorded in the shareholder register on the "Capital Reduction Share Exchange Benchmark Date." For every 1,000 shares, 250 shares will be reduced (i.e., 750 new shares issued). Fractional shares less than one share after reduction may be consolidated by shareholders during the period from five business days before the transfer suspension date to one day before the suspension date, by applying to the company’s share agent. Fractional shares remaining below one share after consolidation, or those not consolidated within the deadline, will be converted to cash at par value, rounded down to the nearest dollar. The Chairman is authorized to arrange for specific parties to purchase such fractional shares at par value. As the company’s shares are issued in dematerialized form and in compliance with the centralized securities depository and book-entry transfer system, the cash proceeds from fractional shares will be used to cover dematerialization or depository transfer fees. (viii) The new shares issued through this cash reduction will be in dematerialized form and will carry the same rights and obligations as the original shares.

II. Schedule for Capital Reduction and Share Issuance: (i) Last Trading Day for Reduced Shares: July 22, 2026. (ii) Trading Suspension Period: July 23, 2026, to July 31, 2026. (iii) Last Transfer Date for Reduced Shares: July 26, 2026. (Correction) (iv) Transfer Suspension Period: July 27, 2026, to July 31, 2026. (v) Capital Reduction Share Exchange Benchmark Date: July 31, 2026. (vi) New Share Issuance and Listing Date (also the delisting date for old shares): August 3, 2026. (vii) Cash Refund Distribution Date: August 13, 2026. (viii) From the new share listing date, old shares will no longer be valid for trading or settlement.

III. Procedures and Formalities for Issuing New Shares: (i) The company’s share agent will mail a notice of share issuance due to capital reduction to each shareholder for the purpose of issuing new shares. (ii) Shares already deposited in the securities custodial account will be automatically exchanged by the Taiwan Depository & Clearing Corporation on the new share listing date; shareholders do not need to take any action. (iii) Transfer Procedures: Shareholders who have not yet completed transfer registration, due to the last transfer date (July 26, 2026) falling on a weekend, must complete in-person registration at the company’s share agent, "Fubon Securities Share Agency Department," by 16:00 on Friday, July 24, 2026. Mail applications must bear a postmark dated July 26, 2026 (the last transfer date). For shareholders participating in centralized transfer through the Taiwan Depository & Clearing Corporation, the company’s share agent will process transfers directly based on submitted documents. (Correction) (iv) Location for Share Exchange: Fubon Comprehensive Securities Share Agency Department, 11th Floor, No. 17, Xuchang Street, Zhongzheng District, Taipei City. Tel: 02-2361-1300. (v) Shareholders applying by mail should send their request via registered mail to the above address.

IV. This plan will be implemented upon approval by the Taiwan Stock Exchange Corporation. In accordance with shareholder meeting resolutions, the Chairman is authorized to adjust the schedule based on actual operational progress to align with regulatory timelines.

V. Any matters not covered herein shall be handled in accordance with the Company Act and other relevant laws and regulations.

4. Share Issuance Benchmark Date: 115/07/31 5. Start Date of Transfer Suspension: 115/07/27 6. End Date of Transfer Suspension: 115/07/31 7. Rights and Obligations of New Shares After Reduction: Same as the originally issued ordinary shares. 8. Expected Listing Date of New Shares: 115/08/03 9. Expected Number of Listed Ordinary Shares After Reduction: 268,971,680 shares. 10. Ratio of Listed Ordinary Shares After Reduction to Total Issued Ordinary Shares (Post-reduction Listed Shares / Post-reduction Issued Shares): 100% 11. If the above two items result in less than 60 million listed shares or less than 25%, explain measures for low liquidity: Not applicable. 12. Other Matters to be Clarified: The annual shareholders’ meeting on May 12, 115 authorized the Chairman to determine the capital reduction benchmark date and the capital reduction share exchange benchmark date, among other related matters.