China BlueChemical Ltd. — Proxy Solicitation & Information Statement 2023

Apr 6, 2023

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

(Stock Code: 3983)

Reply Slip for H Shareholders’ Class Meeting

I/(We) of (address) , telephone number: and fax number: , being the holder(s) of overseas-listed foreign share(s) (“ H Shares ”) of China

BlueChemical Ltd. (the “ Company ”) hereby confirm that I (We) wish to attend or appoint a proxy to attend (on my/ (our) behalf) the class meeting for the shareholders of H Shares (“ H Shareholders’ Class Meeting ”) to be held at the Meeting Room 1401, Kaikang CNOOC Mansion, No. 15 Sanqu, Anzhenxili, Chaoyang District, Beijing, the PRC on Thursday, 25 May 2023 at 9:40 a.m.

Signature(s):

Date:

2023

Note: Shareholders of H Shares who intend to attend the meeting in person or by proxy should return the reply slip in person, by post or by fax to Computershare Hong Kong Investor Services Limited on or before Friday, 5 May 2023. The address of Computershare Hong Kong Investor Services Limited is 17M Floor, Hopewell Centre, 183 Queen’s Road East, Wanchai, Hong Kong.

• For identification purpose only