China BlueChemical Ltd. — Proxy Solicitation & Information Statement 2025

Jul 3, 2025

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.

中海石油化学股份有限公司

China BlueChemical Ltd.*

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

(Stock Code: 3983)

NOTICE OF THE FIRST EXTRAORDINARY GENERAL MEETING OF 2025

NOTICE IS HEREBY GIVEN that the extraordinary general meeting (the “EGM”) of China BlueChemical Ltd. (the “Company”) will be held at 3rd Floor Meeting Room, Kaikang CNOOC Mansion, No. 15, Sanqu, Anzhenxili, Chaoyang District, Beijing, the PRC, on Monday, 18 August 2025 at 9:00 a.m. Unless otherwise indicated, capitalised terms used in this notice and the following resolution shall have the same meanings as those defined in the circular of the Company dated 4 July 2025. The EGM is for the purposes of considering and, if thought fit, passing the following resolution:

By way of special resolution:

1. To consider and approve the amendments to the articles of association of the Company and the cancellation of the supervisory committee of the Company and to authorise the Board to deal with on behalf of the Company the relevant filing and amendments (including but not limited to the amendments required by filing authorities (company registration authorities) during the filing, where necessary) procedures and other related issues arising from the amendments to the articles of association of the Company and the cancellation of the supervisory committee of the Company.

By Order of the Board

China BlueChemical Ltd.*

Kuang Xiaobing

Company Secretary

Beijing, the PRC

4 July 2025

As at the date of this notice, the executive directors of the Company are Mr. Hou Xiaofeng, Mr. Rao Shicai and Ms. He Qinhui, the non-executive directors of the Company are Ms. Shao Lihua and Mr. He Qizhong, and the independent non-executive directors of the Company are Mr. Lin Feng, Mr. Xie Dong and Mr. Yang Wanhong.

• For identification purposes only

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Notes:

1. In order to determine the list of shareholders who are entitled to attend and vote at the EGM, the register of members will be closed from 19 July 2025 to 18 August 2025 (both days inclusive), during which no transfer of shares will be effected. In order to qualify for attendance at the EGM, all instruments of transfer, accompanied by the relevant H share certificates, must be lodged with the Hong Kong share registrar for H Shares, Computershare Hong Kong Investor Services Limited at Shops 1712-1716, 17th Floor, Hopewell Centre, 183 Queen’s Road East, Wanchai, Hong Kong, not later than 4:30 p.m. on 18 July 2025. Shareholders of the Company whose names appear on the register of members of the Company on 18 August 2025 are entitled to attend the EGM.

2. A shareholder entitled to attend and vote at the EGM may appoint one or more proxies to attend and vote in his/her stead. A proxy need not be a shareholder of the Company. Where a shareholder has appointed more than one proxy to attend the EGM, such proxies may only vote on a poll.

The instrument appointing a proxy must be in writing under the hand of a shareholder or his/her attorney duly authorised in writing. If the shareholder is a corporation, that instrument must be either under its common seal or under the hand of its attorney or duly authorised attorney(s). If that instrument is signed by an attorney of the shareholder, the power of attorney authorising that attorney to sign or other authorisation document must be notarised.

In order to be valid, in respect of Domestic Shareholders, the proxy form together with the power of attorney or other authorisation document (if any) must be deposited at the Company’s Secretary Office of the Board in China (Address: Room 1707, Kaikang CNOOC Mansion, No. 15, Sanqu, Anzhenxili, Chaoyang District, Beijing, the PRC) not less than 24 hours (i.e., by 9:00 a.m., Sunday, 17 August 2025) before the time fixed for holding the EGM. In respect of the Company’s H Shares, the said documents together must be lodged at the Company’s H Share Registrar within the above-mentioned period by H Shareholders. The H Share Registrar of the Company is Computershare Hong Kong Investor Services Limited, whose address is 17M Floor, Hopewell Centre, 183 Queen’s Road East, Wanchai, Hong Kong. Completion and return of the proxy form will not preclude a shareholder from attending and voting in person at the EGM if he/she so wishes.

1. Shareholders who intend to attend the EGM in person or by proxy should return the reply slip in person, by post or by fax to the Company’s Secretary Office of the Board in China (for Domestic Shareholders) or Computershare Hong Kong Investor Services Limited (for H Shareholders) on or before Tuesday, 29 July 2025. The Company’s Secretary Office of the Board in China is Room 1707, Kaikang CNOOC Mansion, No. 15, Sanqu, Anzhenxili, Chaoyang District, Beijing, the PRC (Tel: 0086-010-84527250, Fax: 0086-010-84527254, Post code: 100029). The address of Computershare Hong Kong Investor Services Limited is 17M Floor, Hopewell Centre, 183 Queen’s Road East, Wanchai, Hong Kong.

2. Shareholders or their proxies must present proof of their identities upon attending the EGM. Should a proxy be appointed, the proxy must also present copies of his/her proxy form, or copies of appointing instrument and power of attorney, if applicable.

3. The EGM is expected to last not more than one day. Shareholder or proxies attending the EGM are responsible for their own transportation and accommodation expenses.

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