Datang Environment Industry Group Co., Ltd. — Proxy Solicitation & Information Statement 2026

Jun 9, 2026

Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this notice, make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this notice.

Datang Environment Industry Group Co., Ltd.* 大唐環境產業集團股份有限公司

(A joint stock company incorporated in the People's Republic of China with limited liability)

(Stock Code: 1272)

NOTICE OF 2025 ANNUAL SHAREHOLDERS' MEETING

NOTICE IS HEREBY GIVEN that the annual shareholders' meeting of Datang Environment Industry Group Co., Ltd.* (the "Company") for the year of 2025 (the "2025 ASM") will be convened at 2 p.m. on Tuesday, 30 June 2026 at No. 120 Zizhuyuan Road, Haidian District, Beijing, the PRC, for the purpose of considering and, if thought fit, passing the following matters (whether amended or not). Terms used in this notice shall have the same meanings as those defined in the circular of the Company dated 9 June 2026 (the "Circular") unless otherwise specified.

Ordinary Resolutions

(1) To consider and approve the Report of the Board for 2025;
(2) To consider and approve the Independent Auditor's Report and the Audited Financial Statements for 2025;
(3) To consider and approve the Final Financial Accounts for 2025;
(4) To consider and approve the Financial Budget Report for 2026;
(5) To consider and approve the Profit Distribution Plan for 2025 and the Proposed 2025 Final Dividend;

• For identification purpose only

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(6) To consider and approve the re-appointment of Moore CPA Limited and Da Hua CPAs (Special General Partnership) as international and domestic auditors of the Company for 2026, respectively, with terms of engagement ended upon the conclusion of the 2026 annual shareholders' meeting of the Company, and the grant of authority to the Board, which further grants such authority to the senior management of the Company to determine remunerations of the auditors;

(7) To consider and approve the Remuneration Report for Directors for 2025; and

(8) To consider and approve the Investment Plan for 2026.

The main texts of resolutions at the 2025 ASM are set forth in the Circular, which is available on the website of the Stock Exchange (www.hkexnews.hk) and on the website of the Company (www.dteg.com.cn).

By order of the Board

Datang Environment Industry Group Co., Ltd.*

Zhu Liming

Chairman

Beijing, the PRC, 9 June 2026

As of the date of this notice, the executive Director is Mr. Zhu Liming; the non-executive Directors are Mr. Xu Chun, Mr. Pang Xiaojin, Mr. Xia Huaixiang, Mr. Chu Hongbo and Ms. Wang Mi; and the independent non-executive Directors are Mr. Mao Zhuanjian, Mr. Suen Chun Hung, Benjamin and Ms. Hu Yunqing.

• For identification purpose only

Notes:

i. In order to ascertain the entitlements of the Shareholders to attend and vote at the 2025 ASM, the register of members of the Company will be closed from Thursday, 25 June 2026 to Tuesday, 30 June 2026 (both days inclusive). Shareholders whose names appear on the register of members of the Company on Tuesday, 30 June 2026 are entitled to attend and vote at the 2025 ASM.

To be eligible to attend and vote at the 2025 ASM, all transfer documents must be lodged with the H Share Registrar, Computershare Hong Kong Investor Services Limited at Shops 1712-1716, 17th Floor, Hopewell Centre, 183 Queen's Road East, Wanchai, Hong Kong (for holders of H Shares), or the Company's board office in the PRC at No. 120 Zizhuyuan Road, Haidian District, Beijing, the PRC, 100097 (for holders of Domestic Shares), no later than 4:30 p.m. on Wednesday, 24 June 2026.

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ii. Each Shareholder entitled to attend and vote at the 2025 ASM may, by completing the form of proxy of the Company, appoint one or more proxies to attend and vote at the 2025 ASM on its behalf. A proxy need not be a Shareholder. With respect to any Shareholder who has appointed more than one proxy, the proxy holders may only vote on a poll.

iii. The instrument to appoint a proxy shall be signed by the appointer or his/her attorney duly authorised in writing or, in the case of a legal person, must be either executed under its common seal or under the hand of its directors or attorney duly authorised.

iv. To be valid, the form of proxy must be lodged with the H Share Registrar, Computershare Hong Kong Investor Services Limited, at 17M Floor, Hopewell Centre, 183 Queen’s Road East, Wanchai, Hong Kong (for holders of H Shares) or the Company’s board office in the PRC at No. 120 Zizhuyuan Road, Haidian District, Beijing, the PRC, 100097 (for holders of Domestic Shares) within 24 hours prior to the holding of the 2025 ASM. If such instrument is signed by another person under a power of attorney or other authorisation documents given by the appointer, such power of attorney or other authorisation documents shall be notarised. The notarised power of attorney or other authorisation documents shall, together with the instrument appointing the proxy, be deposited at the specified place at the time set out in such instrument. Completion and return of the proxy form will not preclude Shareholders from attending and voting in person at the 2025 ASM or any adjourned meetings should you so wish.

v. Shareholders shall produce their identity documents and supporting documents in respect of Shares held when attending the 2025 ASM. If corporate Shareholders appoint authorised representative to attend the 2025 ASM, the authorised representative shall produce his/her identity documents and a notarised certified copy of the relevant authorised documents signed by the Board or other authorised parties of the Shareholders or other notarised certified documents allowed by the Company. Proxies shall produce their identity documents and the proxy forms signed by the Shareholders or their attorney when attending the 2025 ASM.

vi. The Company has the rights to request a proxy who attends the 2025 ASM on behalf of a Shareholder to provide proof of identity.

vii. The 2025 ASM is expected to be held for less than half a day. Shareholders who intend to attend the 2025 ASM shall bear their own transportation and accommodation expenses.

viii. In case of joint Shareholders, the vote of the most senior one (in person or by proxy) will be accepted to the exclusion of the votes of other joint Shareholders, and for this purpose, the seniority shall be determined by the order in which the names of such joint Shareholders stand in the register of members of the Company.

ix. H Share Registrar, Computershare Hong Kong Investor Services Limited, is situated at Shops 1712–1716, 17th Floor, Hopewell Centre, 183 Queen’s Road East, Wanchai, Hong Kong, and with the fax number: +852 2865 0990.

x. The contact details of the Company’s board office in the PRC are as follows:

Address: No. 120 Zizhuyuan Road, Haidian District, Beijing, the PRC, 100097
Fax number: +86 10 5838 9860

xi. All dates and time in this notice refer to Hong Kong dates and time.

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