公告日期：2025-04-17

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

（在中华人民共和国注册成立的股份有限公司）

（Stock Code 股份代号：2883）

16 April 2025
Dear non-registered shareholder(s),

Reminder letter regarding the Arrangement of Electronic Dissemination of Corporate Communications

With reference to the notification letter dated 28 February 2024 titled “Arrangement of Electronic Dissemination of Corporate Communications”,
China Oilfield Services Limited (the “Company”) is writing to remind you that the Company has adopted electronic dissemination of corporate
communications (the “Corporate Communications”), which mean any documents issued or to be issued by the Company for the information or
action of holders of any of its securities, including but not limited to (a) the directors’ report, its annual accounts together with a copy of the
auditors’ report and, where applicable, its summary financial report; (b) the interim report and, where applicable, its summary interim report; (c)
a notice of meeting; (d) a listing document; (e) a circular and (f) a proxy form.

Please note that both the English and Chinese versions of all future Corporate Communications will be available electronically on the website of
the Company at www.cosl.com.cn and the HKEXnews website at www.hkexnews.hk in place of printed copies.

The Company have not received your functional email address from the Intermediaries. As a non-registered shareholder, to ensure timely
receipt of theActionableCorporateCommunicationsfromtheCompanypursuant to theListing Rules,youshould liaisewithyourbank(s),
broker(s), custodian(s), nominee(s) or HKSCC Nominees Limited through which your Shares are held (collectively, the “Intermediaries”)
and provide your email address to your Intermedi……
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