Investor Presentaiton

14 STN TSX NYSE Significant Backlog Backlog ($ millions) Q 4 AND YEAR END 2023 • $6,306 $6,350 $6,306 $5,902 Q4 2022 Q4 2023 Q3 2023 Q4 2023 6.8% growth since December 31, 2022 4.6% organic growth; organic backlog growth in Water and Buildings . Represents approximately 12 months of work. San Fernando Groundwater Basin Remediation Project Los Angeles, California, US

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