MOSA — Proxy Solicitation & Information Statement 2026

May 29, 2026

mosa

Mosa Industrial Corporation

Meeting Notice of Annual General Shareholders' Meeting

(Translation)

The 2026 Annual General Shareholders' Meeting (the "Meeting") of Mosa Industrial Corporation (the "Company") will be convened at 10:00 a.m., Monday, June 29, 2026 at No.18, Kehu 3rd Rd., Huwei Township, Yunlin County, Taiwan. The attendance registrations will be accepted from 9:30 a.m. in the location of the meeting.

I. The Agenda for the Meeting is as follows:

1. Report Items:

(1) 2025 Business Report.
(2) Audit Committee's Review Report on the 2025 Final Accounting Documents.
(3) Report on the Proposal not to Proceed with the Private Placement of Common Shares approved by the 2025 Annual General Shareholders' Meeting.

1. Ratification Items:

(1) Proposal on the 2025 Business Report and Financial Statements.
(2) Proposal on the 2025 Deficit Compensation.

1. Discussion Item:

Proposal for the Private Placement with Issuance of Common Shares.

1. Election Item:

Proposal to Full re-election of the Company's directors and independent directors.

1. Other Proposal:

Proposal to lift non-competition restrictions on the Company's newly elected directors and their representatives.

1. Extemporary Motions:

II. The Company's private placement with issuance of common shares are detailed in the Attachment annexed hereto.

III. There will be nine Directors (including four Independent Directors) elected at the Meeting, and election shall be conducted in accordance with the candidate nomination system. The list of nominated candidates is as follows:

Director Candidates: The-Hsin Wang, Kao Investment Corporation Representative: Mei-Li Tsai, Yongxin International Investment Co., Ltd. Representative: Ming-Jih Li, Chao-Kao Chen, Ching-Jung Chen.

Independent Director Candidates: Chung-Hung Liao, Chao-Li Chen, Ju-Chi Liu,

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Hsin-Ming Chen.

For more details regarding each candidate’s educational background and work experience, please refer to Market Observation Post System website (https://mops.twse.com.tw).

IV. The main contents of this Annual General Meeting listed in the meeting notice, pursuant to Article 172 of the Company Act of the Republic of China, it also will be uploaded on the website, Market Observation Post System (TWSE MOPS) (https://mops.twse.com.tw). Please access to the Main page (English Version) and click “Electronics Books/Shareholders’ Meetings,” and enter the Stock Code "4564" and Year "2026, and then select the “Meeting Handbook” of Shareholders Information to query.

V. Pursuant to Article 165 of the Company Act of the Republic of China, the shareholder register will be closed from May 1, 2026 to June 29, 2026.

VI. Other than the announcement on the website, Market Observation Post System (TWSE MOPS), the Shareholder's Attendance Card and Proxy Page are hereby provided. If Shareholder decide to attend the meeting in person, please sign or stamp on the "Attendance Card (the third page)" and bring it to the meeting venue on the day of the meeting. Shareholder may sign or seal in the "Proxy Statement (the fourth page)" to appoint a proxy to attend the meeting on his or her behalf. Please send out such written "Proxy Statement" to the Company's Stock Registration and Transfer Service Agent, Grand Fortune Securities Co., Ltd. no later than fifth (5) the day prior to the meeting date. After Transfer Agency Department of Grand Fortune Securities Co., Ltd. Verifying the data is correct, the entrusted Attendance Card will be sent to the appointed proxy for receipt, as proof of attendance at the shareholders' meeting. If the appointed proxy has not received the Attendance Card one day before the meeting, please bring the ID card to the venue for attendance on the day of the meeting.

VII. If shareholders solicit proxies for the Annual General Meeting, the Company will compile a summary statement of proxy solicitation and disclose it in the website of Securities & Futures Institute (SFI) on May 29, 2026. Investors can access SFI's website (https://free.sfi.org.tw) for relevant information. For inquiries, please login the website and click “Free Inquiry System for Information Related to the Public Announcement of Proxy Form;” and enter the Stock Code "4564".

VIII. This (2026) Annual General Meeting will adopt electronic voting as one of the

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methods for shareholders to vote for resolutions from May 30, 2026 to June 26, 2026. Please simply login the "Shareholder's e-vote" page of Taiwan Depository and Clearing Corporation (https://stockservices.tdcc.com.tw) and vote in accordance with the instructions.

IX. The Transfer Agency Department of Grand Fortune Securities Co., Ltd. is the proxies tallying and verification institution for this shareholders' meeting.

X. Please take notice of this matter accordingly.

To Shareholders

Board of Directors
Mosa Industrial Corporation