Solid Q2 2022 Earnings Presentation

4 STN TSX NYSE PEOPLE GROWTH Our core values drive our achievements We Put People First World's Best Employers Forbes Corporate Knights Canada Best 50 Corporate Citizens Gender Equality Index Bloomberg Top Indigenous Workplace Top 50 Workplaces for Indigenous STEM Professionals We Do What Is Right EXCELLENCE INNOVATION 2022 Corporate Knights Global 100 Ranked #1 most sustainable corporation among peers Ranked among top 1% in the world on sustainable performance 1.5°C Validated our science-based target Sustainability-Linked Loan Linked to Bloomberg Gender-Equality Index We Are Better Together $60 million Committed to donations of $60M by 2030; $31 M donated since 2007 $200,000 Annual Equity & Diversity Scholarships 5,100+ We Are Driven to Achieve Climate Leader CDP A-Climate Change Score Prime ISS ESG Corporate Rating Low Risk Sustainalytics Partnered through our Community Engagement Program

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