Investor Presentaiton

Q4 AND YEAR END 2023 STN TSX-NYSE Q4 2023 Financial results Gross and net revenue ($ millions) $1,514 $1,609 $1,242 $1,130 Q4 2022 Gross Revenue Q4 2023 Net Revenue Adjusted EBITDA and Adjusted EBITDA margin(1) ($ millions and % of NR) 17.0% 15.7% Project margin ($ millions and % of NR) 54.9% 53.9% $621 $670 Q4 2022 Q4 2023 Adjusted diluted earnings per share ($) (1) $0.82 $0.82 $192 Q4 2022 $195 Q4 2023 Q4 2022 Q4 2023 10 (1) Adjusted EBITDA, adjusted EBITDA margin and adjusted diluted earnings per share are non-IFRS measures (discussed in the Definitions section of Stantec's 2023 Annual Report).

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