TASC — Proxy Solicitation & Information Statement 2026

May 21, 2026

TASC

Taiwan-Asia Semiconductor Corporation

2026 Annual Shareholders' Meeting Notice
(Summary Translation)

The 2026 Annual Shareholders' Meeting (the "Meeting") of Taiwan-Asia Semiconductor Corporation will be convened at 9:00 a.m. on June 25, 2026 at No. 773, Ming-Hu Road, Hsinchu, 300, Taiwan (LAKESHORE HOTEL Leith Castle 2F Eiffel Banquet Room)

A. The agenda for the Meeting is as follows:

I. Report Items

1. 2025 Business Report.
2. 2025 Audit Committee Report.
3. 2025 Directors’ Remuneration Report.
4. The Company's Improvement Plan and Implementation for Exceedance of Endorsement and Guarantee Limits.

II. Ratification and Discussion Items

1. The 2025 Financial Statements and Business Report are hereby submitted for recognition.
2. Adoption of the Proposal Deficit Compensation for 2025.
3. A revision to the Company’s Rules of Procedure for Shareholders Meetings is hereby submitted for discussion.

III. Extraordinary motion

B. The Company will compile and post a general list of information on calls for proxies, if any, by May 25, 2026, on the Securities & Futures Institute website (http://free.sfi.org.tw). Investors may conduct search for the information by logging on the above site. The Stock Transfer Agency Department of Taishin Securities Co., Ltd. will certify the tally of proxies.

C. According to Article 165 of the Company Act, the book closure period for ordinary shares starts from April 27, 2026 to June 25, 2026.

D. The shareholders may exercise their voting rights through the STOCKVOTE platform of Taiwan Depository & Clearing Corporation (http://www.stockvote.com.tw) during the period from May 26, 2026 to June 22, 2026.

Sincerely,

Board of Directors

Taiwan-Asia Semiconductor Corporation

This English version is a translation based on the original Chinese version. Where any discrepancy arises between the two versions, the Chinese version shall prevail.