Investor Presentaiton

LO 5 STN TSX NYSE Record 2023 financial results Net revenue $5.1B | 14% Increased earnings driven by: Q4 AND YEAR END 2023 Adjusted EBITDA (1) Organic Net Revenue Growth (1) $831M ▲ 15% 9.9% Adjusted EBITDA Margin (1) Acquisition Growth (1) 16.4% | 20bps 1.5% Adjusted Diluted EPS (1) Project Margin $3.67 | ▲ 17% 54.2% (1) Adjusted EBITDA, adjusted EBITDA margin, and adjusted diluted EPS are non-IFRS measures, and organic net revenue growth and acquisition growth are other financial measures (discussed in the Definitions section of Stantec's 2023 Annual Report). 2023 KEY DRIVERS Robust investment / demand from both public and private sectors continues Strong project execution Efficiencies gained through operating leverage

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