Sustained Infrastructure Holding Co. — Proxy Solicitation & Information Statement 2026

May 20, 2026

The Board of Directors of Sustained Infrastructure Holding Company (“SISCO Holding”) invites its shareholders to attend the Ordinary General Assembly Meeting (First Meeting)

2190 · 20/05/2026 15:45:05 · Announcement #95557 · View on Saudi Exchange

The Board of Directors of Sustained Infrastructure Holding Company (“SISCO Holding”) invites its shareholders to attend the Ordinary General Assembly Meeting (First Meeting)

Element List	Explanation
Introduction	The Board of Directors of Sustained Infrastructure Holding Company (“SISCO Holding”) is pleased to invite the shareholders to participate and vote in the Ordinary General Assembly Meeting (First Meeting), scheduled to be held on Wednesday, 10 June 2026, at the Company’s headquarters in Jeddah through modern technology means.
City and Location of the General Assembly's Meeting	The Company's headquarters in Jeddah - via modern technological means (Tadawulaty system)
Hyperlink of the Meeting Location	Click Here
Date of the General Assembly's Meeting	2026-06-10 Corresponding to 1447-12-24
Time of the General Assembly’s Meeting	18:30
Methodology of Convening the General Assembly’s Meeting	Via modern technology means
Attendance Eligibility, Registration Eligibility, and Voting End	The shareholders who are registered in the company's shareholders register at the Depository Center at the end of the trading session preceding the General Assembly meeting shall be eligible to attend the General Assembly meeting, in accordance with the laws and regulations. The shareholders shall have the right to appoint a proxy other than a member of the Board of Directors to attend the meeting.

The eligibility for registration to attend the General Assembly meeting shall end at the time of the General Assembly meeting, and the eligibility for attending shareholders to vote on the items of the General Assembly meeting shall end when the voting committee has finished counting the votes. Quorum for Convening the General Assembly's Meeting In accordance with Article 30 of the Bylaws, the Ordinary General Assembly meeting shall be valid if attended by shareholders representing at least one-fourth of the Company’s capital. If the quorum required for holding the meeting is not met, a second meeting will be held one hour after the end of the period specified for the first meeting. The second meeting shall be valid regardless of the number of shares represented therein. General Assembly Meeting Agenda Please find the attached documents Proxy Form The shareholder right in discussing the assembly agenda topics, asking questions, and exercising the voting right The shareholders shall have the right to discuss the General Assembly meeting agenda items and raise questions. Voting through Tadawulaty is available for all shareholders at no cost via the following link:

http://tadawulaty.com.sa Details of the electronic voting on the Assembly’s agenda Shareholders registered in Tadawulaty electronic services may remotely vote on the items of the Ordinary General Assembly meeting through the electronic voting as of 01:00 a.m., Saturday 6 June 2026 and until the end of the General Assembly meeting. Registration and voting via Tadawulaty services will be available at no cost for all shareholders using the following link:

www.tadawulaty.com.sa Method of Communication in Case of Any Enquiries In case of inquiry, kindly contact Investor Relations, via telephone No. (0126619500) or email to: IR@sisco.com.sa Additional Information The shareholders will be allowed to raise questions and inquiries pertaining to agenda items during the assembly meeting, via the assembly broadcast link that will be sent to the shareholders via Tadawulaty services. Inquiries will only be accepted upon providing the shareholder’s full name. Attached Documents     

The Capital Market Authority and Saudi Exchange take no responsibility for the contents of this disclosure, make no representations as to its accuracy or completeness, and expressly disclaim any liability whatsoever for any loss arising from, or incurred in reliance upon, any part of this disclosure, and the issuer accepts full responsibility for the accuracy of the information contained in it and confirms, having made all reasonable enquiries, that to the best of their knowledge and belief, there are no other facts or information the omission of which would make the disclosure misleading, incomplete or inaccurate.