CHAMPION — Proxy Solicitation & Information Statement 2026

May 15, 2026

CHAMPION BUILDING MATERIALS CO., LTD.

Meeting notice of Annual General Shareholders' Meeting

The 2026 Annual General Shareholders' Meeting of Champion Building Materials Co., Ltd. (the "Company") will be convened at 9:00 a.m., on Wednesday, June 17th, 2026 at No. 200-7, Zhugaocuo, Neighborhood 13, Dapu Vil., Zhunan Township, Miaoli County, Taiwan.

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

1. Meeting Agenda:

I. Reported Matters:

(1) Business Report for the year 2025.
(2) Audit Committee's Review Report.
(3) Status of endorsement and guarantee arrangements.
(4) Status of loans of funds to others.
(5) Implementation status of related-party transactions for the year 2025.
(6) Distribution of employees' and directors' remuneration for the year 2025..
(7) Payment of directors' remuneration for the year 2025.

II. Acknowledged Matters:

(1) To Ratify the Company's 2025 Business Report and Financial Statements.
(2) To Ratify the Company's Profit and Loss Appropriation in 2025.

III. Matters for Other Discussion: Amendment to the " Rules of Procedure for Shareholders' Meeting".

IV. Questions and Motions

1. The proposal for the distribution of 2025 earnings has been resolved by the Board of Directors as follows: Cash Dividend: A total of NT$57,977,531 shall be appropriated, representing a distribution of NT$0.15 per share.

2. In accordance with Article 172 of the Company Act and relevant regulations, the contents of the matters proposed to the shareholders' meeting may be viewed on Market Observation Post System.

(website :http://mops.twse.com.tw/mops/web/index), by clicking on "electronic books/annual report and materials related to shareholders' meeting" or by clicking on "profiles/company profiles/company website" which will link to the Company's website.

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

2. Please find enclosed the notice of Annual General Shareholders' Meeting and one

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copy of the proxy. If you wish to attend the meeting in person, please sign or stamp your personal chop on such notice and process with the check-in on the day of the meeting (please do not send the signed notice to the Company if you intend to attend in person). If you wish to delegate a proxy to 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, i.e. June 12th, 2026) to the Company's designated Stock Agent, i.e. SinoPac Securities Corp., Stock Register Agency Department, at 3F., No. 17, Bo'ai Rd., Zhongzheng Dist., Taipei City.

1. Shareholders, solicitors and authorized agents should bring their identity documents for verification before attending the Shareholders' Meeting.

2. In the event of a public solicitation of proxy for the Annual General Shareholders' Meeting of the Shareholders, the Company will upload a summary table of information from solicitors to the website (http://free.sfi.org.tw) of the Securities and Futures Institute before for Shareholders to inquire. Investors may directly enter the website and go to "system for free inquiry of relevant information on proxy announcement" then click to choose "please type in any inquiries (company code: 1806).

3. Voting rights of shareholders for the Annual General Shareholders' Meeting may be exercised via electronic means from May 16th, 2026 to June 14th, 2026. Please log in through the "Electronic Voting Platform for Shareholders" at the website of Taiwan Depository and Clearing Corporation and vote by following the relevant instructions (http://www.stockvote.com.tw).

4. The tallying and verification institution of company proxies is The Transfer Agency Department of SinoPac Securities Corp.

5. Kindly take note and proceed accordingly.

Board of Directors

Champion Building Materials Co., Ltd