Q4 and Full-Year 2020 Financial Performance

4 Q4 2020 STN TSX-NYSE Executing our strategy DESIGN WITH COMMUNITY IN PEOPLE CLIENTS MIND EXCELLENCE GROWTH INNOVATION CREATING COMMUNITIES Adjusted EBITDA Margin 15.7% Adjusted EBITDA margin increased by 0.2% to 15.7% from 15.5% in 2019. Record Adjusted Diluted EPS $2.22 2020 Adjusted diluted EPS increased 9.9%. Backlog $4.4B Backlog grew organically by 3.1% year over year. (11 months of work.)

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