Investor Presentaiton

7 Q4 AND YEAR END 2023 STN TSX-NYSE Canada Gross and net revenue ($ millions) $1,427 $1,337 $1,246 $1,151 $1.3 Billion $357 $358 $291 $307 BACKLOG Q4 2022 Q4 2023 2022 2023 Gross Revenue Net Revenue 8.3% organic growth Double-digit organic growth in: . • • Environmental Services – permitting, archaeology resource assessments - and environmental impact assessments Infrastructure large-scale bridge and roadway projects Water-wastewater solutions Pelly Cross Pool Calgary, Alberta, Canada

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