Mr. John Beck reports

AECON ANNOUNCES VOTING RESULTS OF ANNUAL GENERAL MEETING AND THE ELECTION OF THREE NEW MEMBERS TO BOARD OF DIRECTORS

The nominees listed in Aecon Group Inc.'s management information circular dated May 2, 2024, have been elected as directors of Aecon to hold office until the close of the next annual general meeting of the corporation or until their successors are appointed. As disclosed, Anthony P. Franceschini and J.D. Hole did not stand for re-election and have retired from Aecon's board.

On behalf of Aecon's board of directors, John M. Beck, chairman, announced the election of Leslie Kass, Rod Phillips and Scott Stewart to Aecon's board.

"We are pleased to welcome Ms. Kass, Mr. Phillips and Mr. Stewart to our board of directors. Collectively, they bring a breadth of knowledge and valuable insights that will be of great benefit to Aecon as we continue to build what matters to enable future generations to thrive," said Mr. Beck.

Ms. Kass is currently serving as the chief executive officer and director of the board of North Coast Holdings and Lewis Services. Ms. Kass is a respected leader with over 30 years of experience in the utility and energy sectors. She was previously the CEO at Babcock & Wilcox and served as executive vice-president at TC Energy's corporate technical centre. Ms. Kass has also held leadership positions at Westinghouse Electric Company, Nuclear Energy Institute, Entergy and Duke Energy. Ms. Kass earned an undergraduate degree in material science and engineering from the Massachusetts Institute of Technology and holds an MBA from Duke University. She has also served on the board of Bruce Power and Babcock & Wilcox Enterprises.

Mr. Phillips is the vice-chair of Canaccord Genuity Corp. and a member of the board of directors of Canaccord Genuity Group Inc. In 2018, he was elected as the member of provincial Parliament representing Ajax. Mr. Phillips also served as the Minister of Finance, the Minister of Long-Term Care, and the Minister of Environment, Conservation and Parks. Prior to his public service, he was the president and chief executive officer of the Ontario Lottery and Gaming Corp. and Morneau-Shepell. Mr. Phillips served as the chair of the board of Postmedia Network Inc., as Canadian chair and global advisory board member of Afiniti, and on the corporate boards of Data Communications Management, Top Aces and the Interprovincial Lottery Corp. A graduate of the MBA program at Wilfrid Laurier University, he also holds an honours bachelor of arts degree in political science and English from Western University, and holds the Institute of Corporate Directors designation, ICD.D.

Mr. Stewart served for over four decades at IBI Group, taking on various leadership roles. Mr. Stewart led the growth of the company geographically across North America and internationally, and the diversification into technology and systems. He took over as the CEO of IBI in 2013 and fulfilled that role until the sale of the company in 2022. He was also a member of IBI's board of directors from 2004 to 2022. Mr. Stewart's current and previous board experience spans various associations, including the Transportation Association of Canada and the Intelligent Transportation Society of Canada. He holds a civil engineering degree from the University of Waterloo and is a professional engineer (PEng) in multiple Canadian jurisdictions.

Remarking on the retirement of Mr. Franceschini and Mr. Hole from Aecon's board, Mr. Beck said, "On behalf of my fellow members of the board and Aecon's management, we thank Anthony and J.D. for their commitment and valuable service as guiding forces in Aecon's success and evolution for the past 15 years."

Mr. Franceschini held the role of lead director since 2021, and was also previously chair of Aecon's audit committee, and a member of the risk committee and the environmental, health and safety committee. He is the retired president and CEO of Stantec Inc. Mr. Hole served as chair of Aecon's environmental, health and safety committee and as a member of the audit committee. He previously served as chairman of Lockerbie & Hole, an Aecon predecessor company.

Shareholders also adopted all other resolutions submitted for their approval, as disclosed in the management information circular dated May 2, 2024, including the advisory vote on the corporation's approach to executive compensation, the approval of unallocated units under the corporation's long-term incentive plan and the appointment of PricewaterhouseCoopers LLP as the auditor of the corporation to hold office until the close of the next annual meeting of the corporation (and the board of directors is authorized to fix the auditor's remuneration).

The complete voting results for each item of business are set out herein.

Dividend

Aecon's board of directors approved its next quarterly dividend of 19 cents per share. The dividend will be paid on July 3, 2024, to shareholders of record as of June 21, 2024.

About Aecon Group Inc.

Aecon is a North American construction and infrastructure development company with global experience. Aecon delivers integrated solutions to private and public sector clients through its construction segment in the civil, urban transportation, nuclear, utility and industrial sectors, and provides project development, financing, investment, management, and operations and maintenance services through its concessions segment.

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