OUR PURPOSE PIONEERING SCIENCE ENVIRONMENT COMMUNITY REPORTING 60 BIOGEN 2021 YEAR IN REVIEW PATIENTS OUR PEOPLE Fostering an ethical culture The Elements of our culture Just as the periodic table of elements reflects the building blocks of our universe, the Biogen Elements are the foundation of our company’s culture. We celebrate the Biogen Elements – pioneering spirit, strong ethics, personal accountability, inclusivity, agility and unwavering customer focus – with our annual CEO Elements Awards. Nominations in 2021 reflected every function and geography, and we celebrated 55 winning teams and individuals for a total of 747 awards for exceeding expectations while embodying the Biogen Elements. We were pleased with the strong cross-functional project alignment, with 70% of projects involving team members from more than one function. Ethically grounded Every action we take – from investigating therapies to promoting health equity to engaging with Patient Advocacy Groups and our communities – is guided by our credo of Caring Deeply, Working Fearlessly and Changing Lives™, and is supported by our eight Ethical Principles. Our Ethical Principles are detailed and made public in our Code of Business Conduct , which encompasses individual and collective responsibilities and our unwavering commitment to never compromise on integrity. We sustain an environment of trust, honesty and transparency while ensuring appropriate confidentiality. We believe these commitments are key enablers of Biogen’s growth and essential for upholding our reputation. Þ READ MORE ABOUT OUR ETHICAL PRINCIPLES IN OUR CODE OF BUSINESS CONDUCT 1 We respect patients 2 We respect healthcare professionals 3 We work together as a team 4 We are responsible to our communities 5 We are fair and honest 6 We are transparent and ethical 7 We protect information and assets 8 We never compromise our integrity Compliance with our Code of Business Conduct, Ethical Principles and the law is mandatory for all employees and a priority of our leaders, without exception. Every employee is expected to report actual or suspected violations of the law or the Code of Business Conduct either to their manager or through an anonymous 24/7 helpline. Regardless of the type of misconduct reported, we do not tolerate retaliation against anyone who cooperates with an investigation or who makes a good faith report of an alleged violation of laws, regulations, the Code of Business Conduct or our policies. All claims of misconduct, and any claims of retaliation against reporters of misconduct, are thoroughly investigated and resolved. At the enterprise level, we monitor and address compliance issues very closely. Globally, we have 20 full-time compliance officers to support our operations. These officers use advanced artificial intelligence and other technology tools to identify issues and address them fully and expeditiously. BIOGEN’S ETHICAL PRINCIPLES Any success we achieve, if not achieved ethically, is no success at all. In our employee survey, 83% agreed that “people at Biogen behave ethically,” ranking above industry benchmark. We are pleased that ethics is one of our areas of greatest strength, year on year, on our employee survey.