Taiwan Mask Corporation — Proxy Solicitation & Information Statement 2026

May 18, 2026

Taiwan Mask Corporation
2026 Annual General Shareholders’ Meeting Notice
(Summary Translation)

I. The 2026 Shareholders’ Meeting will be held on Thursday, June 18, 2026 at 9:00 a.m. (Registration time for shareholders will be 30 minutes prior to the meeting) at 2F, No. 2, Zhanye 1st Rd., East District, Hsinchu City (2F Conference Room, Taiwan Science Park Association), with the following main content: (I) Report: 1. The Company’s 2025 Business Report. 2. Report on the Audit Committee’s review of the Company’s 2025 financial statements. 3. Report on the Status of Endorsements/Guarantees Provided by the Company and Its Subsidiaries in 2025. 4. Report on the Status of the Company’s 2025 Private Placement of Securities.

(II) Adoption: Item 1: The Company’s 2025 Business Report and Financial Statements. Item 2: The Company’s 2025 deficit compensation proposal. Item 3: The Company’s proposal for the use of proceeds from the additional private placement of securities in 2025..

(III) Discussion: Item 1: The Company’s proposal for requesting an underwriter to issue an assessment opinion on the necessity and reasonableness of the private placement of securities in 2025. Item 2: The Company intends to conduct a private placement of common shares.

(IV) Election: Motion 1. Re-election of directors.

(V) Other Matters: Motion 1: Lift the restrictions on the non-compete clause of new directors and their representatives.

(VI) Extempore motions.

(VII) Meeting Adjourned.

II. Private placement of marketable securities, submitted for resolution. Detail please see the 2026 Annual General Meeting Handbook attachment 10 and 11.

III. The list of director candidates. Please refer to handbook Attachment 12 (including relevant information, and their academic.) The director candidates, please visit the Market Observation Post System (MOPS) at [https://mops.twse.com.tw] for further details.

IV. For the newly elected directors of the Company and their representatives serving in positions at other companies, please refer to Attachment 13 of the handbook. Without prejudice to the interests of the Company, it is proposed to request the 2026 Annual General Meeting to approve the release of the non-competition restrictions from the date of assuming office, provided that the actual persons elected as directors and their representatives shall prevail.

V. If the causes and subjects of the shareholders’ meeting are under Article 172 of the Company Act, please go to the Market Observation Post System

---

(https://mops.twse.com.tw) and click "Annual Report and Shareholders' Meeting Related Information" in the "eBook" under "Basic Information", enter the company code / or abbreviation and year, and click "Supplementary Information for the Meeting" or "Reference Information for the Shareholders' Meeting". Click on "Meeting Handbook and Supplementary Information for Meetings" or "Reference Information for Shareholders' Meeting".

VI. In accordance with Article 165 of the Company Act, the stock transfer was suspended from April 20, 2026 to June 18, 2026.

VII. In addition to the announcement on the Market Observation Post System, a shareholder attendance card and a proxy form were issued to shareholders to attend the meeting. If you are attending the meeting in person, please fill out the attendance card of the 3rd copy (no need to send it back) and bring it to the meeting location on the day of the meeting. If you appoint a proxy to attend the meeting, please fill out the proxy form of the 4th copy and send it to the stock affairs agency department of Grand Fortune Securities, the Company's shareholder services provider, 5 days before the meeting. After the department has stamped the attendance card with the registration seal, it will be sent to you or your proxy. If you or your proxy has not received the attendance card by the day before the meeting, please bring your ID card and seal to the meeting location on the day of the meeting to attend the meeting.

VIII. If there is a proxy solicitor for the shareholders' meeting, the Company intends to submit the written information of the proxy solicitation to the Securities and Futures Institute of the R.O.C. (URL: https://www.sfi.org.tw) by May 18, 2026, in accordance with the regulations. After accessing the website, investors should enter the stock code/company in the "Free Inquiry System for Proxy Forms".

IX. At the shareholders' meeting, you can exercise your voting rights electronically during the period from May 19, 2026 to June 15, 2026. Please visit the "Stock vote Platform" website of Taiwan Depository & Clearing Corporation and follow the relevant instructions to vote [URL: https://www.stockvote.com.tw].

X. The verification institution of proxy forms for the shareholders' meeting is the Stock Affairs Agency Department of Grand Fortune Securities.

XI. Please follow the instructions. Yours sincerely

The Board of Directors of Taiwan Mask Corporation,