Investor Presentaiton

25 STN TSX NYSE GROWTH INNOVATION PEOPLE Q4 2019 Overview 7.8% growth in net revenue driven by: 5.3% organic growth in all business operating units 2.8% acquisition growth mainly focused in Buildings 8.2% increase in gross margin reflecting continued focus on project execution and project mix Q4 19 Organic net revenue growth (retraction) $4.3 B gross revenue backlog ■ United States ■ Canada ■Global 1.6% 9.6% (0.5%) 1.3% 0.1% 13.2% 7.5% 4.7% 5.3% EXCELLENCE 2% backlog increase from end of 2018 11 months of work 600 1,000 500 800 400 Net revenue 600 in millions CAD 300 400 200 Q4 18 Q4 19 200 100 0 0 Canada United States Global Buildings Energy & Resources Environmental Infrastructure Services Water Overall

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