Q4 and Full-Year 2020 Financial Performance

8 Q4 2020 STN TSX-NYSE • • United States Gross and net revenue ($ millions) $3,000 $2,000 $2,688 Backlog $2,655 $1,948 $1,960 $2.5 Billion $1,000 $660 $600 $466 $440 $0 Q4 2019 Q4 2020 2019 2020 Gross Revenue Net Revenue Q4 Project Wins • Pure Water San Diego Phase 1 of the US$3 billion program to supply sustainable water to 1.4M people Design for 6 public schools In Prince George's County, Maryland 9 bridge and 2 roadway projects Including three bridges on the Maple River, North Dakota. Denver Water Administration Building LEED Certified Platinum Denver, Colorado, USA

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