OUR PURPOSE PIONEERING SCIENCE 153 BIOGEN 2021 YEAR IN REVIEW PATIENTS OUR PEOPLE ENVIRONMENT COMMUNITY REPORTING Biogen is committed to supporting the recommendations of the Task Force on Climate-related Financial Disclosures (TCFD) to enhance transparency on climate-related matters. This statement represents our second disclosure aligned with the TCFD recommendations. It covers all facilities and operations globally which are owned by Biogen or for which we have operational control. Our 2021 CDP Climate Change disclosure provides further background on our approach to climate change and should be read alongside these disclosures. Þ OUR CDP RESPONSES ARE AVAILABLE HERE Governance TCFD recommendations for disclosures on Governance A. Describe the board’s oversight of climate-related risks and opportunities. B. Describe management’s role in assessing and managing climate-related risks and opportunities. Biogen’s Board of Directors has oversight of Environmental, Social and Governance (ESG) issues. This includes our Healthy Climate, Healthy Lives™ program, launched in September 2020, which is an important framework to identify and act on climate-related risks and opportunities. This $250 million, 20-year initiative was developed with input from members of the Board of Directors and our Executive Leadership Team, governing bodies which authorized and approved the program. Our CEO is ultimately responsible for assessing and managing Biogen’s climate-related risks and opportunities, including Biogen’s performance on our Healthy Climate, Healthy Lives initiative. That effort is managed and tracked by a formal Governance Committee comprised of executive-level members from across the business. The Committee meets quarterly to guide and deliver on Healthy Climate, Healthy Lives commitments, and provides regular updates to the full Executive Leadership Team. Nicole Murphy, EVP and head of Pharmaceutical Operations & Technology, a direct report of the CEO, is executive sponsor and Chair of the Healthy Climate, Healthy Lives Governance Committee. Biogen has aligned Healthy Climate, Healthy Lives with its Enterprise Risk Management (ERM) process to ensure climate-related risks and opportunities are integrated into our overall business strategy. Our ERM team monitors strategic climate-related risks across all aspects of our business and utilizes climate scenarios as part of its assessments. On an annual basis, the ERM team evaluates identified risks, including any climate-related physical and transitional risks, by engaging the leaders who oversee and run the day-to-day work of the Healthy Climate, Healthy Lives initiative. The ERM team provides annual updates on their findings and activities to the Biogen Executive Team, including those with oversight of Healthy Climate, Healthy Lives, as well as the Board of Directors. Starting in 2021, to support Biogen’s strategic management of climate-related issues and ESG generally, a portion of the compensation of every executive officer and all other employees has been tied to advancing our ESG strategy, which includes our Healthy Climate, Healthy Lives targets. Strategy TCFD recommendations for disclosures on Strategy A. Describe the climate-related risks and opportunities the organization has identified over the short, medium and long term. B. Describe the impact of climate-related risks and opportunities on the organization’s businesses, strategy and financial planning. C. Describe the resilience of the organization’s strategy, taking into consideration different climate-related scenarios, including a 2°C or lower scenario. Through Healthy Climate, Healthy Lives and our ERM progress, we are taking a strategic approach in identifying and responding to climate- related risks and opportunities and their impacts on our business, including impacts on our financial planning, products and services, supply chain management, investment in R&D, and operations. Our Task Force on Climate-related Financial Disclosures Statement