MSSCORPS CO., LTD. — Proxy Solicitation & Information Statement 2026

May 11, 2026

MS MATERIAL SCIENCE SERVICE

MSSCORPS CO., LTD.

Meeting Notice of 2026 Annual Shareholders’ Meeting

I. Time: 9:00 am., June 11, 2026
(The check-in time for shareholders will begin at 8:30 am.)

Location: 2nd Floor, No. 1, Industry East 2nd Rd, East District, Hsinchu City
(GIS HSP Convention Center - EDISON Meeting Room)

Meeting Agenda

Esteemed Shareholders:

II.
(I) Reports
1. 2025 Business Report
2. 2025 Report on the Review of the Final Statement from the Audit Committee
3. 2025 Employees' and Directors' Compensation Distribution Report
4. Report on the Distribution of Cash Dividends from 2025 Earnings
5. Report on the correlation between the policy on Directors' Remuneration, the description and amount of individual remuneration, and the Evaluation result for 2025.

(II) Ratification Items:
1. Proposal for the 2025 Business Report and Financial Statements
2. Proposal of 2025 earning distribution

(III) Extempore Motions

III. The 2025 fiscal year profit distribution plan has been approved by the Board of Directors. A cash dividend of NT$1 per share will be distributed, with the ex-dividend date being April 17, 2026, and the payment date being May 8, 2026.

IV. The main agenda of the Meeting, including matters specified under Article 172 of the Company Act or Article 26-1 of the Securities and Exchange Act, if any, beyond those listed in the convening notice, can be directly accessed on the M.O.P.S (website: https://mops.twse.com.tw). Please click on "Basic Information/E-Books/Annual Reports and Shareholders' Meeting Related Information (including depository receipt information)," enter the Company code and fiscal year, and select the relevant shareholders' meeting information for further details.

V. Pursuant to Article 165 of the Company Act, no alterations to the shareholder registry will be processed from April 13,2026, until June 11,2026. Should there be a requirement for the initiation of account opening procedures (inclusive of submitting a seal card), please direct inquiries to the Stock Service Department of Taishin Securities Co., Limited.

VI. The Company will compile a summary statement of the relevant information provided by shareholders through solicitation of the proxy and disclose the content on the website of

2026 Notice of Annual General Shareholders’ Meeting

---

MS MATERIAL SCIENCE SERVICE

Securities & Futures Institute (SFI) on May 11, 2026. Investors can navigate to SFI’s website: http://free.sfib.org.tw and search for details. (Stock Code:6830) Stock Service Department of Taishin Securities Co., Limited is the proxy tallying and verification institution for the Company.

VII. In addition to the announcement from M.O.P.S., please find enclosed the "Notice of Attendance" and "Proxy Statement." If you intend to personally attend the meeting, please sign or stamp on the "Attendance Sign-in Card" provided in the third section, and bring it to the venue for registration on the day of the meeting (please do not send it back). Shareholders may sign or place their seal in the "Proxy Statement" to appoint a proxy to attend the meeting on his or her behalf and execute power of attorney in writing. Please fill in the "Proxy Statement" and deliver to the Company's stock agency, Stock Service Department of Taishin Securities Co., Limited, at least 5 days prior to the meeting date.

VIII. The Meeting will adopt electronic voting as one of the methods to act the right of vote. Voting period: From May 12, 2026 to June 8, 2026. For voting instructions, please visit the Taiwan Depository & Clearing Corporation (TDCC) Stockvote e-voting platform for further information [Website: https://stockservice.tdcc.com.tw].

IX. Attendees of Meeting are kindly requested to bring identification documents for verification purposes.

X. Your kind attention and adherence to this directive are sincerely appreciated.

Sincerely yours,

Board of Directors
MSSCORPS CO., LTD.

2026 Notice of Annual General Shareholders' Meeting