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

(Stock Code: 2883)

Reply Slip for 2020 Annual General Meeting

I (We)

of

(address)

telephone number:

and fax number:

being the holder(s) of

H Share(s)/A Share(s)* of

China Oilfield Services Limited (the "Company") hereby confirm that I (We) wish to attend or appoint a proxy to attend (on my (our) behalf) the Annual General Meeting (the "AGM") to be held on 1 June 2021 (Tuesday) at 10:00 a.m. (Beijing time) at Room 311, Main Building of COSL, 201 Haiyou Avenue, Yanjiao Economic & Technological Development Zone, Sanhe City, Hebei Province, the PRC.

Signature:

Date:2021

Note: Holders of H Shares who intend to attend the AGM must complete and return the written replies for attending the AGM to the Company's registered office by facsimile or post no later than 12 May 2021 (Wednesday):

Address: 65/F., Bank of China Tower

1 Garden Road, Hong Kong

Tel: (852) 2213 2515

Fax: (852) 2525 9322

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COSL - China Oilfield Services Limited published this content on 14 April 2021 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 14 April 2021 09:34:02 UTC.