Q4 and Full-Year 2020 Financial Performance

6 LEADERS IN SUSTAINABILITY STN TSX NYSE We are a proven sustainability leader Net Zero Carbon neutral for 2022, then net zero for 2030 #5 Ranked fifth most sustainable corporation in the world Our Operational Pledge 2021 Corporate Knights Global 100 CDP (1) Score ISS ESG (2) Quality Score 2020 2019 2018 E S G A- A- A- 1 1 1 #1 Ranked most sustainable corporation in North America Sustainalytics (3) ESG Risk Rating Low Notes: (1) CDP Website - October 14, 2020 (2) ISS Sustainability Suite - February 5, 2021 (3) Sustainalytics website - January 7, 2021

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