JAN-DEC 2020 BIOGEN POLITICAL CONTRIBUTIONS DISCLOSURES

TRADE ASSOCIATION MEMBERSHIP DUES ATTRIBUTED TO LOBBYING TRADE ASSOCIATION - AMOUNT OF 2020 JANUARY TO JUNE 2020 JULY TO DECEMBER 2020 ANNUAL DUES PAID TO DATE ATTRIBUTED TO LOBBYING Pharmaceutical Research and Manufacturers $2,079,645 $238,664 of America (PhRMA) Biotechnology Innovation Organization (BIO) $206,674 $20,500 Massachusetts Biotechnology Council (MassBIO) $11,055 Healthcare Leadership Council $45,000 California Life Sciences Association $25,080 National Health Council $2,012 Personalized Medicine Coalition $1,780.60 Trade associations listed are those to which we paid $25,000 or more in annual dues in 2020. Amounts attributed to lobbying have been identified by those organizations as non-deductible under Section 162(e) (1).

CONTRIBUTIONS TO SECTION 527 POLITICAL ORGANIZATIONS & BALLOT COMMITTEES*

RECIPIENT JANUARY TO JUNE 2020 JULY TO DECEMBER 2020 BIOCOM PAC $860 California Life Sciences Association PAC $9,700 Democratic Governors Association $100,000 Democratic Legislative Campaign Committee $25,000 Democratic Lieutenant Governors Association $20,000 GOPAC $15,000 PhRMA PAC $7,800 Republican Lieutenant Governors Association $10,000 Republican Legislative Campaign Committee $60,000 Republican Governors Association $100,000 *Exclusive of conference attendance fees for 527 organizations, where such fees do not exceed $5,000.

CONTRIBUTIONS TO 501(c) (4) SOCIAL WELFARE ORGANIZATIONS

RECIPIENT JANUARY TO JUNE 2020 JULY TO DECEMBER 2020 American Action Forum $25,000 New Democratic Network $50,000

CORPORATE CONTRIBUTIONS TO POLITICAL CANDIDATES, PARTIES AND COMMITTEES

Supplier / Customer State JANUARY TO JUNE 2020 JULY TO DECEMBER 2020 RALPH E MASSULLO JR CAMPAIGN FL $500 CAMPAIGN FL $500 CAMPAIGN FL $500 CAMPAIGN FL $500 DANNY BURGESS CAMPAIGN ACCOUNT FL $1,000 GAYLE HARRELL CAMPAIGN FL $1,000 CAMPAIGN FL $500 JASON BRODEUR CAMPAIGN FL $1,000 CAMPAIGN FL $500

ADDITIONAL DISCLOSURES: For more information on Biogen’s Political Contributions Policy, please visit: http://investors.biogen.com/governance/governance-documents.