Investor Presentaiton

11 STN TSX-NYSE Q4 AND YEAR END 2023 2023 Financial results Gross and net revenue ($ millions) $5,677 Project margin ($ millions and % of NR) $6,480 54.2% 54.2% $5,066 $4,457 2022 Gross Revenue 2023 Net Revenue Adjusted EBITDA and Adjusted EBITDA margin (1) ($ millions and % of NR) 16.2% 16.4% $831 $724 2022 2023 $2,745 $2,417 2022 2023 Adjusted diluted earnings per share ($) (1) $3.13 2022 (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). $3.67 2023

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