BamSEC and AlphaSense Join Forces
Learn More

Biogen Inc. – Indentures

NASDAQ: BIIB    
Share price (5/21/26): $189.47    
Market cap (5/21/26): $28.0 billion
Search in Documents
Key Exhibits
External Links

Indentures Filter

EX-4.2
from 8-K 43 pages Biogen Inc., as Issuer and U.S. Bank Trust Company, National Association, as Trustee Fourth Supplemental Indenture Dated as of May 12, 2025
12/34/56
EX-4.4
from S-8 2 pages Certificate of Amendment to the Certificate of Incorporation of Biogen Inc. Pursuant to Section 242 of the General Corporation Law of the State of Delaware Article X
12/34/56
EX-4.6
from 10-K 1 page Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934
12/34/56
EX-4.8
from 10-K 28 pages Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934
12/34/56
EX-4.5
from 8-K 22 pages Registration Rights Agreement
12/34/56
EX-4.4
from 8-K 11 pages 3.250% Senior Note Due 2051
12/34/56
EX-4.3
from 8-K 10 pages 3.250% Senior Note Due 2051
12/34/56
EX-4.2
from 8-K 38 pages Biogen Inc., as Issuer and U.S. Bank National Association, as Trustee Third Supplemental Indenture Dated as of February 16, 2021
12/34/56
EX-4.4
from 10-K 28 pages Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934
12/34/56
EX-4.2
from 8-K 34 pages Biogen Inc., as Issuer and U.S. Bank National Association, as Trustee Second Supplemental Indenture Dated as of April 30, 2020
12/34/56
EX-4.4
from 10-K 15 pages Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934
12/34/56
EX-4.2
from 8-K 50 pages Biogen Inc., as Issuer and U.S. Bank National Association, as Trustee First Supplemental Indenture Dated as of September 15, 2015
12/34/56
EX-4.1
from 8-K 48 pages Biogen Inc. and U.S. Bank National Association, as Trustee Indenture Debt Securities Dated as of September 15, 2015
12/34/56
EX-4.1
from S-3ASR 47 pages Biogen Inc. and U.S. Bank National Association, as Trustee Indenture Debt Securities Dated as Of
12/34/56
EX-4.4
from 10-K 2 pages Amendment No. 2 to Amended and Restated Rights Agreement
12/34/56
EX-4.1
from 8-K 2 pages Amendment No. 2 to Amended and Restated Rights Agreement
12/34/56
EX-4.1
from 8-K 34 pages Biogen Idec Inc., as Issuer and the Bank of New York Trust Company, N.A., as Trustee First Supplemental Indenture Dated as of March 4, 2008
12/34/56
EX-4.1
from S-3ASR 52 pages Biogen Idec Inc. and the Bank of New York Trust Company, N.A., as Trustee Indenture Debt Securities Dated as of February 26, 2008
12/34/56
EX-4.2
from 10-K 1 page Ex-4.2 Specimen Common Stock Certificate
12/34/56
EX-4.1
from 8-K 1 page Amendment No. 1 to Amended and Restated Rights Agreement
12/34/56