OUR PURPOSE PIONEERING SCIENCE 134 GRI CONTENT INDEX BIOGEN 2021 YEAR IN REVIEW PATIENTS OUR PEOPLE ENVIRONMENT COMMUNITY REPORTING GRI indicator Reporting Requirements 2021 Response Alignment SDG 102–21 a. Processes for consultation between stakeholders and the highest governance body on economic, environmental and social topics. b. If consultation is delegated, describe to whom it is delegated and how the resulting feedback is provided to the highest governance body. Executive Leadership Board of Directors Corporate Governance Documents Reporting – 2021 Year in Review [Materiality Assessment] * 102–22 a. Composition of the highest governance body and its committees by: • Executive or non-executive. • Independence. • Tenure on the governance body. • Number of each individual’s other significant positions and commitments, and the nature of the commitments. • Gender. • Membership of under-represented social groups. • Competencies relating to economic, environmental and social topics. • Stakeholder representation. Item 1., Business, 2021 Annual Report ESG Data Table – 2021 Year in Review * 102–26 Highest governance body’s and senior executives’ roles in the development, approval and updating of the organization’s purpose, value or mission statements, strategies, policies and goals related to economic, environmental and social topics. Our Purpose Our Purpose – 2021 Year in Review * 102–30 Highest governance body’s role in reviewing the effectiveness of the organization’s risk management processes for economic, environmental and social topics. Code of Business Conduct Sustainability Policy Environmental Health and Safety Policy Climate Change Position 102–33 Process for communicating critical concerns to the highest governance body. Code of Business Conduct Stakeholder engagement 102–40 A list of stakeholder groups engaged by the organization. 2021 Annual Report Item 1., Business, 2021 Annual Report Executive Leadership Board of Directors Community and Reporting – 2021 Year in Review 102–41 Approximately 13.1% of Biogen’s employees are under a collective bargaining agreement using a time-weighted average basis. ESG Data Table – 2021 Year in Review 102–42 The basis for identifying and selecting stakeholders with whom to engage. Executive Leadership Board of Directors Corporate Governance Documents ESG Data Table – 2021 Year in Review Reporting – 2021 Year in Review 102–43 The organization’s approach to stakeholder engagement, including frequency of engagement by type and by stakeholder group, and an indication of whether any of the engagement was undertaken specifically as part of the report preparation process. Executive Leadership Board of Directors Corporate Governance Documents ESG Data Table – 2021 Year in Review *