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BIOGEN INC.

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BIOGEN INC.

CIK:0000875045|SEC Filings

INDENTURES

EX-4.2
d13940dex42.htm
2025-05-12T00:00:00Z
EX-4.4
d857872dex44.htm
2024-06-20T00:00:00Z
EX-4.4
d124092dex44.htm
2021-02-16T00:00:00Z
EX-4.5
d124092dex45.htm
2021-02-16T00:00:00Z
EX-4.3
d124092dex43.htm
2021-02-16T00:00:00Z
EX-4.2
d124092dex42.htm
2021-02-16T00:00:00Z
EX-4.2
d857739dex42.htm
2020-04-30T00:00:00Z
EX-4.1
d78596dex41.htm
2015-09-16T00:00:00Z
EX-4.2
d78596dex42.htm
2015-09-16T00:00:00Z
EX-4.1
d49097dex41.htm
2015-09-08T00:00:00Z
EX-4.1
a2113458zex-4_1.htm
2003-06-23T00:00:00Z
EX-4.4
b73435biexv4w4.htm
2009-02-06T00:00:00Z
EX-4.1
b73708biexv4w1.htm
2009-01-16T00:00:00Z
EX-4.1
b68753biexv4w1.htm
2008-03-04T00:00:00Z
EX-4.1
b66236s3exv4w1.htm
2008-02-26T00:00:00Z
EX-4.4
EX-4.4.txt
1999-11-10T00:00:00Z
EX-4.3
a2079452zex-4_3.htm
2002-05-13T00:00:00Z
EX-4.2
a2079452zex-4_2.htm
2002-05-13T00:00:00Z
EX-4.1
a2079452zex-4_1.htm
2002-05-13T00:00:00Z
EX-4.1
a2055111zex-4_1.htm
2001-07-27T00:00:00Z