OUR PURPOSE PIONEERING SCIENCE 124 ESG DATA TABLE BIOGEN 2021 YEAR IN REVIEW PATIENTS OUR PEOPLE ENVIRONMENT COMMUNITY REPORTING Code Units 2018 2019 2020 2021 Hazardous and Biohazardous Waste MT 233 219 208 269 Recycled MT 16 16 14 <1 Waste to Energy MT 145 138 117 211 Incineration 19 MT 72 65 77 56 Landfill MT 1 0 0 2 SOCIAL 20 Community Engagement and Giving Total Foundation Grants 21,22 Million USD 4.9 4.7 16.4 6.1 Employee Matching Gifts Program 23 Million USD 1.4 1.7 2.5 2.1 Corporate Grants and Sponsorships 24 Million USD N/A N/A 72.4 71.0 Volunteer Hours 25 Hours 12,200 16,560 4,369 14,493 Biogen Foundation STAR Initiative Investment (Target: Cumulative $10M by 2022) 26 Million USD 2.0 2.7 2.8 2.7 Responsible Supply Chain Supplier Diversity Spend Million USD 160 161 173 230 Supplier Diversity Spend of Total U.S. Spend 27 % 7.4 7.8 8.1 11.8 Workforce Diversity, Equity and Inclusion Women in • Workforce % 50.6 52.5 53.5 53.9 • Management 28 % 48.4 49.8 51.7 53.1 • Director Level and Above % N/A 46 49 47.6 • Management in Revenue-generating Functions 29 % 51.1 50.5 52.3 53.4 • STEM-related Positions % N/A N/A 44.6 48.8 • Junior Management % N/A 51.6 53.7 55.3 • Top Management (VP+) % N/A 39.2 42.9 44.6 • Executive Team % 30 25 29 25 • Board of Directors % 27 23 17 23