Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]:
SEC Accession No. 0000875045-26-000013
Filing Date
2026-02-06
Accepted
2026-02-06 07:36:07
Documents
217
Period of Report
2025-12-31

Document Format Files

Seq Description Document Type Size
1 10-K biib-20251231.htm   iXBRL 10-K 4293142
2 EX-19.1 exhibit191-insidertradinga.htm EX-19.1 140048
3 EX-21 biib-20251231xex21.htm EX-21 50799
4 EX-23 biib-20251231xex23.htm EX-23 2753
5 EX-31.1 biib-20251231xex311.htm EX-31.1 10945
6 EX-31.2 biib-20251231xex312.htm EX-31.2 10679
7 EX-32.1 biib-20251231xex321.htm EX-32.1 8860
13 biib-20251231_g1.jpg GRAPHIC 14533
14 biib-20251231_g10.jpg GRAPHIC 22513
15 biib-20251231_g11.jpg GRAPHIC 17062
16 biib-20251231_g12.jpg GRAPHIC 15572
17 biib-20251231_g13.jpg GRAPHIC 12986
18 biib-20251231_g14.jpg GRAPHIC 13199
19 biib-20251231_g15.jpg GRAPHIC 12208
20 biib-20251231_g16.jpg GRAPHIC 10352
21 biib-20251231_g17.jpg GRAPHIC 10791
22 biib-20251231_g18.jpg GRAPHIC 23004
23 biib-20251231_g19.jpg GRAPHIC 27865
24 biib-20251231_g2.jpg GRAPHIC 167663
25 biib-20251231_g20.jpg GRAPHIC 11887
26 biib-20251231_g21.jpg GRAPHIC 15675
27 biib-20251231_g22.jpg GRAPHIC 117592
28 biib-20251231_g23.jpg GRAPHIC 15534
29 biib-20251231_g24.jpg GRAPHIC 12931
30 biib-20251231_g25.jpg GRAPHIC 16762
31 biib-20251231_g26.jpg GRAPHIC 15667
32 biib-20251231_g27.jpg GRAPHIC 55919
33 biib-20251231_g28.jpg GRAPHIC 89458
34 biib-20251231_g29.jpg GRAPHIC 82613
35 biib-20251231_g3.jpg GRAPHIC 11034
36 biib-20251231_g30.jpg GRAPHIC 111985
37 biib-20251231_g4.jpg GRAPHIC 8296
38 biib-20251231_g5.jpg GRAPHIC 12294
39 biib-20251231_g6.jpg GRAPHIC 9588
40 biib-20251231_g7.jpg GRAPHIC 8254
41 biib-20251231_g8.jpg GRAPHIC 25230
42 biib-20251231_g9.jpg GRAPHIC 73467
  Complete submission text file 0000875045-26-000013.txt   26119761

Data Files

Seq Description Document Type Size
8 XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT biib-20251231.xsd EX-101.SCH 163579
9 XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT biib-20251231_cal.xml EX-101.CAL 181709
10 XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT biib-20251231_def.xml EX-101.DEF 1128962
11 XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT biib-20251231_lab.xml EX-101.LAB 1579570
12 XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT biib-20251231_pre.xml EX-101.PRE 1477050
220 EXTRACTED XBRL INSTANCE DOCUMENT biib-20251231_htm.xml XML 4023615
Mailing Address 225 BINNEY STREET CAMBRIDGE MA 02142
Business Address 225 BINNEY STREET CAMBRIDGE MA 02142 7814642000
BIOGEN INC. (Filer) CIK: 0000875045 (see all company filings)

EIN.: 330112644 | State of Incorp.: DE | Fiscal Year End: 1231
Type: 10-K | Act: 34 | File No.: 000-19311 | Film No.: 26605101
SIC: 2836 Biological Products, (No Diagnostic Substances)
(CF Office: 03 Life Sciences)