Solid Q2 2022 Earnings Presentation

18 A GLOBAL LEADER IN SUSTAINABILITY STN TSX-NYSE Social leadership Community Engagement (CE) $60M by 2030 Committed to investing a further $30 million through our CE program, taking our total to $60 million since starting our CE program in 2007 5,600+ Global community partnerships in the history of our CE program $611K Grants for STEM in 2021 $800K+ Scholarships funded in 2021 $200K Annual Equity & Diversity Scholarship launched in 2021 Inclusion & Diversity We support I&D through partnerships to gain access to top talent from BIPOC communities, sponsoring scholarships and internships for underrepresented and underprivileged students, and through reviewing our internal practices to identify and remove bias. Named on the 2022 Bloomberg Gender Equality Index Participated in the UNGC Target Gender Equality Program and tracked progress against the Women's Empowerment Principles in alignment with SDG #5 Gender Equality Signatory to the UN Women Empowerment Principles since 2015 C-suite is 38% female and 25% are people of color Gender Pay Equity A review of our pay practices found that women have received higher average pay increases since 2018, and are being promoted at a higher rate, than men during the same period. 4% Base pay gap on a median compa ratio basis in North America Voluntary Turnover ~3% lower than industry average Top 50 Workplaces for Indigenous STEM Professionals American Indian Science and Engineering Society The World's Top Female Friendly Companies 2021 Forbes America's Best Employers for Women 2021 Forbes Gender- Equality Index 2022 Bloomberg

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