SUNON — Proxy Solicitation & Information Statement 2026

Apr 23, 2026

Sunonwealth Electric Machine Industry Co., Ltd.

Meeting Notice for the 2026 General Shareholders Meeting

Shareholders' meeting will be held by means of physical shareholders' meeting

I. Time: 9:00 a.m. May 25, 2026 (Monday)

II. Location: 9F, No. 266, Chenggong 1st Rd., Qianjin Dist., Kaohsiung City (Room D, 9F, Grand Hi-Lai Hotel)

III. Chairman's Speech:

IV. Matters to be Reported:

(I) The Company's 2025 Business Report.
(II) 2025 Audit Committee's Report.
(III) Report the 2025 allocation of remuneration for employees and directors.
(IV) Report the 2025 salary adjustment for entry-level employees.
(V) Report the execution of share repurchases.
(VI) Report the status of endorsements and guarantees.
(VII) Report the 2025 remuneration of individual directors.

V. Proposed Resolutions:

(I) 2025 Business Report and Financial Statements.
(II) 2025 earnings distribution proposal.

VI. Discussion Matters

(I) Amendment of the Company's Procedures for Lending Funds to Others.

VII. Extraordinary Motions

1. The distribution of cash dividend of earnings in 2025 has resolved by the Board of Directors meeting on March 5, 2026. The total amount of cash dividends is NT$1,498,968,180. Each share will be entitled to a cash dividend of NT$5.5.

2. If the Company decides to hold a meeting under Article 172 of the Company Law, electronic files will be posted to the Market Observation Post System at https://emops.twse.com.tw. Please select "Electronic Books" under the "Shareholders' Meetings" tab, enter the Stock Code and year, and click "GO" to find the meeting files corresponding to the Company's stock code.

3. Pursuant to Article 165 of the Company Law, the book closure period is from March 27, 2026 to May 25, 2026.

4. One copy of the attendance notification form and proxy form will be attached to this meeting notice. If the shareholder(s) intends to attend the meeting in person, please sign or stamp on the attendance notification form and carry it to the check-in desk on the day of the meeting. In the case that an agent(s) is entrusted to attend the meeting, the shareholder(s) shall sign

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or stamp on the proxy form and personally fill out the name and address of the agent, then deliver the proxy form to the Grand Fortune Securities Corporation Registrar Transfer Department at least 5 days prior to the day of the meeting. The signed proxy form will serve as the sign-in card for agent(s) to represent your vote at the meeting.

1. If a proxy is solicited by the shareholder(s), Sunonwealth Electric Machine Industry Co., Ltd. is required to compile details on the proxy solicitation parties and disclose such information on the Securities & Future Institute (SFI) website no later than April 24, 2026. Shareholder(s) can obtain information from the “Free proxy disclosure & related information system” (http://free.sfi.org.tw), and search via the “proxy disclosure and meeting notices” search page.

2. Shareholders may exercise their voting rights electronically through the STOCKVOTE platform of Taiwan Securities Central Depository Co., Ltd. (https://stockservices.tdcc.com.tw) during the period from April 25, 2026 to May 22, 2026.

3. The Grand Fortune Securities Corporation Registrar Transfer Department is the proxy tallying and verification institution for this AGM.

4. These regulations should be abided and applied accordingly.

Board of Directors

Sunonwealth Electric Machine Industry Co., Ltd.