Solid Q2 2022 Earnings Presentation

17 A GLOBAL LEADER IN SUSTAINABILITY STN TSX-NYSE Governance A diverse board with exceptional backgrounds Certified Integrated Management System: • • . • • . • Environmental Management (ISO 14001:2015) Occupational Health & Safety Management (ISO 45001:2018) Information Security System (ISO 27001:2013) Quality Management (ISO 9001:2015) IT Service Management System (ISO 20000-1:2018) Business Continuity Planning Pandemic Preparedness Internal Practice Audits Robust IT security processes and practices: Next-generation security systems Cybersecurity awareness training for employees Compliance with privacy laws including the General Data Protection Regulation (European Union) and Cyber Essentials Plus (United Kingdom) Board Composition and Experience Sustainability Governance Structure Environmental and Social Factors 78% highly experienced 22% general experience Governance Factors 100% highly experienced Board Sustainability and Safety Committee Functional Service Teams Executive ESG Committee Vice President, Corporate Sustainability SDG Impact Leader Sustainability Services

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