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

May 15, 2026

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)

NOTICE OF DOMESTIC SHAREHOLDERS' MEETING

NOTICE IS HEREBY GIVEN that the first Domestic Shareholders' Meeting for the year 2026 (the "Domestic Shareholders' Meeting") of SINOPEC Engineering (Group) Co., Ltd. (the "Company") will 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 (the "AGM") 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, approving the following resolution. In this notice, unless the context otherwise requires, terms used herein shall have the same meanings as defined in the Company's circular dated 15 May 2026.

By way of a special resolution:

(1) To consider and approve the grant of a general mandate to the Board to repurchase Domestic Shares and/or H Shares.

By Order of the Board

SINOPEC ENGINEERING (GROUP) CO., LTD.

YIN Fengbing

Chief Financial Officer & Secretary to the Board

Beijing, the PRC

15 May 2026

As at the date of this notice, directors of the Company are ZHANG Xinming#, XIANG Wenwu, LI Chengfeng, YU Renming*, YE Zheng+, ZHAO Jinsong+, ZHANG Xuyan+ and XIE Yanli#.

Executive Directors

• Non-executive Directors
• Independent non-executive Directors

This notice is available on the website of Hong Kong Exchanges and Clearing Limited (www.hkexnews.hk) and on the website of the Company (www.segroup.cn).

• For identification purposes only

---

Notes:

ATTENDEES OF THE DOMESTIC SHARES CLASS MEETING

1. Eligibility and Registration Procedures for Attending the Domestic Shares Class Meeting

(a) Closure of Register of Members. For the purpose of ascertaining Domestic Shareholders who are entitled to attend and vote at the Domestic Shareholders' Meeting, the register of members of the Company will be closed from Tuesday, 2 June 2026 to Friday, 5 June 2026 (both days inclusive).

(b) Domestic Shareholders whose names appear on the register of members of the Company before the close of business on Tuesday, 2 June 2026 are entitled to attend and vote in respect of the resolution to be proposed at the Domestic Shareholders' Meeting.

(c) A Domestic Shareholder or his/her/its proxy shall produce proof of identity when attending the meeting. If a Domestic Shareholder is a legal person, its legal representative or other persons authorised by the board of directors or other governing body of such Shareholder may attend the Domestic Shareholders' Meeting by producing a copy of the resolution of the board of directors or other governing body of such Shareholder appointing such persons to attend the meeting.

1. Proxy

(a) A Domestic Shareholder eligible to attend and vote at the Domestic Shareholders' Meeting is entitled to appoint, in written form, one or more proxies to attend and vote on his/her/its behalf. A proxy needs not be a Shareholder.

(b) A proxy should be appointed by a Domestic Shareholder by a written instrument signed by the appointer or his/her/its attorney duly authorised in writing. If the proxy form is signed by the attorney of the appointer, the power of attorney authorising that attorney to sign or the authorisation document(s) must be notarised.

(c) To be valid, the power of attorney or other authorisation document(s) which has been notarised, together with the completed proxy form, must be delivered to the place of business of the Company not less than 24 hours before the time designated for holding the Domestic Shareholders' Meeting.

(d) A Domestic Shareholder or his/her/its proxy may exercise the right to vote by poll.

1. Miscellaneous

(a) The Domestic Shareholders' Meeting is expected to take place immediately after the AGM. Domestic Shareholders attending the Domestic Shareholders' Meeting shall be responsible for their own travel and accommodation expenses.

(b) The place of business of the Company is at:

Floor 6-9, A67, Ande Road, Xicheng District, Beijing, the PRC
Postal Code: 100032
Telephone No.: (+86) 10 5673 0525
Email: seg.ir@sinopec.com

• 2 -