OUR PURPOSE PIONEERING SCIENCE 120 BIOGEN 2021 YEAR IN REVIEW PATIENTS OUR PEOPLE ENVIRONMENT COMMUNITY REPORTING Code Units 2018 2019 2020 2021 GOVERNANCE About Biogen Revenue Million USD 13,453 14,378 13,445 10,982 R&D Spend Million USD 2,597 2,281 3,991 2,501 No. of Employees # 7,800 7,400 9,340 9,832 No. of Permanent Employees # – – 9,103 9,616 No. of FTE # – – 9,192 9,586 No. of R&D Employees # – – 2,284 2,366 No. of Part-time Employees # – – – 137 Workforce Located in U.S. % – – – 57 Board of Directors Total Number of Directors # N/A N/A 13 13 • Executive # N/A N/A 1 1 • Independent # N/A N/A 12 12 ESG Ratings, Rankings and Assessments 1 S&P Global CSA (DJSI) Score 83 (Industry Leader) 83 (Industry Leader) 85 (Industry Leader) 84 (Industry Leader) MSCI Rating A A A A ISS ESG Rating C+ (Prime) C+ (Prime) C+ (Prime) C+ (Prime) Sustainalytics Risk Score N/A 22 23.5 21.3 Human Rights Campaign’s Corporate Equality Index % 100 100 100 100 Disability:IN’s Disability Equality Index % 100 100 100 100 CDP Climate Change Rating A– A– B+ B CDP Water Rating B B B B Corporate Knights Global 100 Rank – – – 97 100 Best Corporate Citizens Rank 37 46 62 17 America’s Most JUST Companies Rank 19 30 150 36 Bloomberg Gender-Equality Index (GEI) Signatory or Participant  ESG Data Table Unless otherwise indicated, content in the data tables below covers the period Jan. 1, 2021 – Dec. 31, 2021.