Sinopec Engineering Group Co Ltd. — Proxy Solicitation & Information Statement 2026

May 15, 2026

中国石化 SINOPEC

中石化煉化工程(集團)股份有限公司

SINOPEC Engineering (Group) Co., Ltd.*

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

(Stock Code: 2386)

Proxy Form for the Domestic Shareholders' Meeting

The number of Domestic Shares relating to this proxy form(Note 1)

I/We $^{(Note 2)}$

of

being the holder(s) of ______ Domestic Share(s) $^{(Note 3)}$ of RMB1.00 each in the capital of SINOPEC Engineering (Group) Co., Ltd.

(the "Company") now appoint $^{(Note 4)}$

(I.D. No.: __ Tel. No.: __ )/the chairman of the meeting as my (our) proxy to attend and vote for me (us) as hereunder at the first Domestic Shareholders' Meeting for the year 2026 (the "Domestic Shareholders' Meeting") to be held at 10:30 a.m. on Friday, 5 June 2026 or immediately after the annual general meeting of the Company for the year 2025 to be convened and held on the same date at the same place at A67, Ande Road, Xicheng District, Beijing, the PRC for the purposes of considering and, if thought fit, passing the special resolution as set out in the Company's Notice of Domestic Shareholders' Meeting dated 15 May 2026. In the absence of any instruction(s), the proxy may vote for or against the resolution at his/her/its own discretion. In this proxy form, unless the context otherwise requires, capitalised terms used herein shall have the same meanings as defined in the Company's circular dated 15 May 2026.

Special Resolution		For^{(Note 5)}	Against^{(Note 5)}	Abstain^{(Note 5)}
1.	To consider and approve the grant of a general mandate to the Board to repurchase Domestic Shares and/or H Shares

Date: ___ 2026

Signature(s): _____ (Note 6)

Notes:

1. Please insert the number and type of share(s) registered under your name(s) relating to this proxy form. If no number is inserted, this proxy form will be deemed to relate to all of the shares in the capital of the Company registered under your name(s).

2. Please insert full name(s) (in Chinese or English) and address(es) as shown in the register of members in BLOCK LETTERS.

3. Please insert the number of shares registered under your name(s) and delete as appropriate. If no number is inserted, this proxy form will be deemed to relate to all of the shares in the capital of the Company registered under your name(s).

4. If any proxy other than the chairman of the Domestic Shareholders' Meeting is preferred, please delete the words "the chairman of the meeting" and insert the name and address of the proxy desired in the space provided. If this is left blank, the chairman of the Domestic Shareholders' Meeting will act as your proxy. A shareholder entitled to attend and vote at the Domestic Shareholders' Meeting may appoint one or more proxies to attend, speak and vote on his/her/its behalf. Such proxies may only exercise their voting rights in a poll. A proxy needs not be a shareholder of the Company but must attend the Domestic Shareholders' Meeting in person to represent you. ANY ALTERATION MADE TO THIS PROXY FORM MUST BE SIGNED BY THE SIGNATORY.

5. Attention: If you wish to vote FOR any resolution, please indicate with a “√” in the appropriate space under “For”. If you wish to vote AGAINST any resolution, please indicate with a “√” in the appropriate space under “Against”. If you wish to ABSTAIN from voting on any resolution, please indicate with a “√” in the appropriate space under “Abstain”, and your voting will be counted in the total number of votes cast in that resolution for the purpose of calculating the result of that resolution. In the absence of any such indication, the proxy will vote or abstain at his/her/its discretion. Any invalid vote or failure to vote shall not be counted as total number of votes for the purpose of calculating the result of that resolution. Your proxy will also be entitled to vote at his/her/its discretion or to abstain on any resolution properly put to the meeting other than those as set out in the notice convening the Domestic Shareholders' Meeting.

6. This proxy form must be signed under hand by you or your attorney duly authorised in writing on your behalf. If the appointer is a legal person, this form must be signed under its common seal or under hand by any director(s) or agent(s) duly appointed by such legal person.

7. In the case of joint holders of shares, any one of such persons may vote at the Domestic Shareholders' Meeting, either personally or by proxy, in respect of such share as if he/she/it were solely entitled thereto; but if more than one of such joint holders are present at the meeting in person or by proxy, the vote of the person, whose name stands first in the register of members of the Company in respect of such share shall be accepted.

8. To be valid, the power of attorney or other authorisation document(s) which have been notarised, together with the completed proxy form, must be delivered to the place of business of the Company at A67, Ande Road, Xicheng District, Beijing, the PRC not less than 24 hours before the time designated for holding the Domestic Shareholders' Meeting (i.e. before 10:30 a.m. on 4 June 2026, Hong Kong time).

For identification purposes only