EX-99.3

Exhibit 99.3

Notice of Annual General Meeting of Shareholders and of Availability of Proxy Materials

Notice is hereby given that the annual general meeting of shareholders (the “Meeting”) of Alithya Group inc. (the “Company”) will be held as a virtual meeting on Wednesday, September 10, 2025 at 10:00 a.m. (Eastern Daylight Time) for the purposes of:


ITEMS OF BUSINESS		FOR MORE DETAILS, PLEASE REFER TO

1	Receiving the audited consolidated financial statements of the Company for the fiscal year ended March 31, 2025 and the auditor’s report thereon (the “Annual Financial Statements”);	Section entitled “Business of the Meeting – Financial Statements” of the management information circular dated July 14, 2025 (the “Information Circular”).

2	Electing the directors of the Company;	Sections entitled “Business of the Meeting – Election of Directors” and “Nominees for Election to the Board” of the Information Circular.

3	Appointing the auditor for the year ending March 31, 2026 and authorizing the Board of Directors to fix the auditor’s compensation; and	Section entitled “Business of the Meeting – Appointment of the Auditor” of the Information Circular.

4	Considering such other business that may properly come before the Meeting or any adjournment or postponement thereof.	Section entitled “Business of the Meeting – Other Business” of the Information Circular.

The Information Circular provides additional information relating to the matters to be dealt with at the Meeting and forms an integral part of this notice. The Board of Directors has fixed July 14, 2025 as the record date for the determination of the shareholders entitled to receive notice of the Meeting and vote at the Meeting. To maximize the number of participants at the Meeting, the Company will be holding the Meeting virtually via a live audio webcast available online at meetings.lumiconnect.com/400-353-766-264, where all shareholders regardless of geographic location will have an equal opportunity to participate and vote.

Notice-and-Access

As permitted under Canadian securities rules, management is using “Notice-and-Access” to deliver the Information Circular prepared in connection with the Meeting and the Annual Financial Statements to both registered and non-registered shareholders. This means that instead of mailing paper copies of the Information Circular and the Annual Financial Statements, these are posted online for shareholders to access them, which reduces mailing and printing costs, and is more environmentally friendly as it reduces paper use. Shareholders will therefore receive by mail (i) this notice, which explains how to access the Information Circular and the Annual Financial Statements electronically and request paper copies, and how to vote and/or attend the Meeting, (ii) a form of proxy (for registered shareholders) or a voting instruction form (“VIF”) (for non-registered shareholders), with instructions on how to vote, and (iii) an additional document explaining how to attend and vote at the Meeting (the “Virtual Meeting User Guide”). Shareholders who previously signed up for electronic delivery of Meeting materials will receive them via email.

How to Access the Information Circular and Annual Financial Statements

The Information Circular and Annual Financial Statements and other Meeting materials are available on our website at www.alithya.com/en/alithya/investors, on the website of our transfer agent, TSX Trust Company (“TSX Trust”), at www.meetingdocuments.com/TSXT/ALYA, as well as on

SEDAR+ at www.sedarplus.ca and on EDGAR at www.sec.gov. Please review the Information Circular before voting.

How to Request Paper Copies

Shareholders may request paper copies of the Information Circular and Annual Financial Statements at no cost.

Before the Meeting, shareholders may request paper copies on the website of TSX Trust at www.meetingdocuments.com/TSXT/ALYA or by contacting TSX Trust at 1-888-433-6443 (toll free in Canada and the U.S.) or 1-416-682-3801. The Information Circular and/or Annual Financial Statements, as applicable, will be sent within three business days of receipt of the request. To receive a paper copy of the Information Circular prior to the 10:00 a.m. (Eastern Daylight Time) voting deadline on September 8, 2025, requests must be received by no later than 10:00 a.m. (Eastern Daylight Time) on August 29, 2025. Shareholders who request paper copies of these documents will not receive a new form of proxy or VIF and should therefore keep the form that was sent to them to vote their shares. After the Meeting, requests for paper copies may be made by email at secretariat@alithya.com, by mail at Corporate Secretariat, Alithya Group inc., 700, René-Lévesque West Blvd, Suite 400, Montréal, Québec, H3B 1X8, or by phone at 1-844-985-5552. Paper copies of the documents will be sent within ten business days of receipt of the request.

How to Vote

Shareholders may vote prior to the Meeting or at the Meeting. It is however recommended that shareholders vote prior to the Meeting using all forms of proxy or VIFs received even if they intend to attend the Meeting. Shareholders should read the Information Circular and other Meeting materials before voting and refer to the instructions on their form of proxy or VIF and in the Information Circular for details on how to vote. Voting instructions must be received by the 10:00 a.m. (Eastern Daylight Time) voting deadline on September 8, 2025 (or if the Meeting is adjourned or postponed, by 10:00 a.m. (Eastern Daylight Time) on the business day prior to the day fixed for the adjourned or postponed meeting).