Aecon Group Inc. — AGM Information 2023

Mar 22, 2023

March 22, 2023

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100 University Avenue, 8th floor Toronto ON, M5J 2Y1 www.computershare.com

To: All Canadian Securities Regulatory Authorities

Subject: AECON GROUP INC.

Dear Sir/Madam:

We advise of the following with respect to the upcoming Meeting of Security Holders for the subject Issuer:

Meeting Type : Annual General Meeting Record Date for Notice of Meeting : April 10, 2023 Record Date for Voting (if applicable) : April 10, 2023 Beneficial Ownership Determination Date : April 10, 2023 Meeting Date : June 06, 2023 Meeting Location (if available) : Toronto, On Issuer sending proxy related materials directly to NOBO: No Issuer paying for delivery to OBO: Yes

Notice and Access (NAA) Requirements:

NAA for Beneficial Holders No NAA for Registered Holders No

Voting Security Details:

Description CUSIP Number ISIN COMMON SHARES 00762V109 CA00762V1094

Sincerely,

Computershare

Agent for AECON GROUP INC.