Sino Horizon — Proxy Solicitation & Information Statement 2026

May 15, 2026

Sino Horizon Holdings Limited

Translation – In case of any discrepancy between the Chinese and English versions, the Chinese version shall prevail.

Meeting Notice of 2026 Annual General Shareholders' Meeting

1. The 2026 Annual General Meeting of Sino Horizon Holdings Limited (the "Company") will be held on Wednesday, June 17, 2026 at 9:00 a.m. at No. 5, Section 5, Xinyi Road, Xinyi District, Taipei City. (Conference Room #2, Exhibition Hall 1, Taipei World Trade Center) Shareholder registration starts at 8:30 am sharp; please sign-in at the meeting location. Main contents of the meeting agenda: (I) Report Matters: (i) 2025 Business Report. (ii) 2025 Audit Committee Review Report. (iii) The Company's report on the 2025 distribution of remuneration to employees and directors. (II) Approval Matters: (i) The Company's 2025 Business Report and consolidated financial statements. (ii) The Company's 2025 profit distribution proposal. (III) Discussion Matters: (i) Amendments to the "Procedures for Endorsement and Guarantees". (ii) Amendments to the "Articles of Association". (IV) Incidental Motion.

2. The content of the proposed cash dividend distribution is as follows: (I) The cash dividends will be distributed totaling NT$ 208,835,638. (II) The cash dividend for this distribution will be NT$0.12 per share.

3. Pursuant to Article 165 of the Company Act, the share register closed period is set from April 19, 2026 to June 17, 2026.

4. Please find enclosed the notice of the shareholders' meeting and one copy of the proxy. If you wish to attend the meeting in person, please sign or stamp your personal chop on such notice and proceed with the check-in on the day of the meeting. If you wish to delegate a proxy to attend the meeting, please sign or stamp your personal chop on the proxy, properly fill in the name of your proxy and deliver (mail) the same (which must be received within five (5) days prior to the meeting) to the Company's designated Stock Agent, i.e. Fubon Securities Co. Ltd., Stock Register Agency Department, at 11F., No. 17, Xuchang St., Zhongzheng District, Taipei.

5. If a shareholder wishes to enlist a proxy, the Company will produce a general checklist stating therein the information of solicitors and the soliciting information by May 15, 2026, and disclose it on the Securities & Futures Institute website (https://free.sfi.org.tw). Investors who wish to make an inquiry may visit the website, go to Free Inquiry System for Announced Information Concerning Proxies, and enter the search criteria. (Stock Code: 2923).

6. Pursuant to Article 26-2 of the Securities and Exchange Act "The notice of the shareholders

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meeting to be given by an issuer to shareholders who own less than 1,000 shares of nominal stocks may be given in the form of a public announcement; for a regular shareholders meeting, such public announcements shall be served with thirty days prior notice".

1. In this shareholders meeting, shareholders may exercise their voting rights in electronic form. The period for which electronic voting may be carried out is from May 16, 2026 to June 14, 2026. Please log in through the "Electronic Voting Platform for Shareholders" at the website of Taiwan Depository and Clearing Corporation (http://www.tdcc.com.tw) with a CA certificate and vote by following the relevant instructions. Pursuant to the Company Act, a shareholder exercises his/her/its voting power at a shareholders' meeting in writing or by way of electronic transmission as set forth in the preceding paragraph shall be deemed to have attended the said shareholders' meeting in person. In case a shareholder has exercised his/her/its voting power in writing or by way of electronic transmission, and has also authorized a proxy to attend the shareholders' meeting in his/her/its behalf, then the voting power exercised by the authorized proxy for the said shareholder shall prevail.

2. In accordance with Article 172 of the Company Act, the contents of the matters proposed to the shareholders' meeting may be viewed on Market Observation Post System (website: https://emops.twse.com.tw/server-java/t58query), by clicking on “Electronic Books/Shareholders’ meetings”, then enter the “Stock Code and Year” to search for information related to the shareholders’ meeting.

3. No souvenirs will be provided at this shareholders' meeting.

To:

Shareholder

Sincerely,

Sino Horizon Holdings Limited Board of Directors