Type	Name	Date
Indenture	Second Supplemental Indenture, between the Company and U.S. Bank National Association, including the forms of Global Notes attached as Exhibit A and Exhibit B, respectively, thereto	04/30/2020
Credit agreement	Credit Agreement, among Biogen Inc., Bank of America, N.A., as administrative agent, swing line lender and the L/C issuer, and the other lenders party thereto	02/03/2020
Indenture	Indenture, between Biogen and U.S. Bank National Association	09/16/2015
Indenture	First Supplemental Indenture, between Biogen and U.S. Bank National Association, including the forms of Global Note attached as Exhibit A, Exhibit B, Exhibit C and Exhibit D, respectively, thereto	09/16/2015
Credit agreement	Credit Agreement between Biogen Inc., Bank of America, N.A., as administrative agent, swing line lender and an L/C issuer, and the other lenders party thereto	09/01/2015