Capital Markets Overview

Why Invest in Aecon? Unprecedented Demand $6.0B BACKLOGⓇ $40B+ ACTIVE BID PIPELINE • Record level of infrastructure investment underway across Aecon's focus areas • * THE #1 CANADIAN INFRASTRUCTURE COMPANY Diversified & Resilient Business Model $4.0B $241M TOTAL CONSTRUCTION $63M CONCESSIONS REVENUE* EBITDA *+@ EBITDA *+@ • Diversified by geography, sector, contract size and type in Construction segment Government investment in infrastructure is a key source of economic stimulus as part of COVID-19 recovery plans Strong private sector, multi-year capital programs Positive population and immigration dynamics driving long-term, sustainable demand • • Over 900 discrete projects typically underway with average project size <$25 million Valuable and growing Concessions portfolio Strong recurring revenue base adds further stability and growth opportunity to business mix • Partner of choice for international and domestic players Strong track record of growth and margin improvement • . ~41% of TTM revenue from unit price/cost plus contracts • Well positioned in growth markets linked to sustainability * Q3 2021 Trailing Twelve Months ("TTM") + Before corporate costs and eliminations ^ Compound Annual Growth Rate ("CAGR") of annual dividend from 2012 to 2021 # CAGR of full year Diluted EPS from 2015 to 2020 & December 31, 2015 to December 31, 2020 @ This is a non-GAAP financial measure. Refer to Section 4 "Non-GAAP And Supplementary Financial Measures" in the Company's Q3 2021 MD&A. ACCON ~ Sustainability projects help to preserve and protect the environment, but also help to preserve the ability of society to sustain itself. Including but not limited to, projects that: reduce emissions, support the transition to a net-zero economy, support clean water use and conservation, and reduce/recycle waste. 13% 10 YEAR DIVIDEND CAGR Sustainable Shareholder Value Creation 23% 5 YEAR EPS CAGR# 25% 5 YEAR TOTAL SHAREHOLDER RETURN & Disciplined, balanced and diverse capital allocation program and strategy • History of consistent dividend increases . Growth in Concessions portfolio provides future value creation options Focused on sustainability, including a 30% GHG reduction target by 2030 and a net zero target by 2050 Over 50% of 2020 revenue tied to sustainability projects Current valuation multiple provides attractive upside potential First Canadian construction company to incorporate a sustainability-linked credit facility tied to ESG objectives 3

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