Investor Presentaiton

34 EXCELLENCE INNOVATION PEOPLE GROWTH STN TSX NYSE Global millions (C$) $250 $200 $150 $100 $50 $0 $1,000 $800 $600 $400 Gross Revenue $200 Net Revenue $0 Q4 19 Q4 18 2019 2018 Quarterly Highlights Slight organic retraction due to declining commodity prices, project wind downs and slowing UK Transportation sector Continued growth in Environmental Services Steady work in UK AMP projects Center Parcs, Longford Forest County Longford, Ireland Net revenue growth Q4 19 FY 2019 14.5% 32.7% Organic net revenue growth (retraction) (0.5%) 4.7% Backlog at December 31, 2019 $630M

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