Investor Presentaiton

6 STN TSX-NYSE Q4 AND YEAR END 2023 United States Gross and net revenue ($ millions) $3,057 $3,635 $2,684 $2,267 $4.0 Billion $822 $902 $578 $662 BACKLOG Q4 2022 Q4 2023 2022 2023 Gross Revenue Net Revenue 5 12.3% organic growth & 2.4% acquisition growth Double-digit organic growth in: • . • - Water public sector and industrial projects; large-scale water security projects in western US Buildings - healthcare, industrial, civic, and science and technology Energy & Resources - hurricane recovery and power grid modernization in Puerto Rico Spaghetti Bowl Express Interchange and Landscape Reno, Nevada, US

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