Biogen BIIB SEC Filings

NASDAQ BIIB
$253.84 +12.86 (+5.34%)
At close: Oct 22, 2026 · 4:00 PM EDT
EDGAR Disclosures

SEC Filings

Source SEC EDGAR

Every SEC filing Biogen Inc. (BIIB) has made, as reported on EDGAR — annual and quarterly reports, current reports, insider transactions and ownership disclosures. Filter by form group, form type or period, and open any filing or its index directly.

Form Type
# Form Type Form Group Accession Date Filing Index
14Insider Transaction0000875045-26-000084Oct 5, 2026 1:00 AM
24Insider Transaction0000875045-26-000082Sep 3, 2026 8:14 PM
33Insider Transaction0000875045-26-000080Aug 12, 2026 8:50 PM
4SCHEDULE 13GBeneficial Ownership Report0000315066-26-001959Aug 6, 2026 2:17 PM
54Insider Transaction0000875045-26-000076Aug 5, 2026 8:03 PM
6144Insider Transaction0001959173-26-005582Aug 4, 2026 3:22 PM
7144Insider Transaction0001959173-26-005518Aug 3, 2026 5:02 PM
810-QQuarterly & Annual Report0000875045-26-000075Jul 29, 2026 6:36 AM
98-KCurrent Report0000875045-26-000073Jul 29, 2026 6:10 AM
108-KCurrent Report0000875045-26-000068Jul 1, 2026 8:08 PM
114Insider Transaction0000875045-26-000065Jun 11, 2026 9:50 PM
124Insider Transaction0000875045-26-000064Jun 11, 2026 9:47 PM
134Insider Transaction0000875045-26-000063Jun 11, 2026 9:46 PM
144Insider Transaction0000875045-26-000062Jun 11, 2026 9:44 PM
154Insider Transaction0000875045-26-000060Jun 11, 2026 9:34 PM
164Insider Transaction0000875045-26-000059Jun 11, 2026 9:32 PM
174Insider Transaction0000875045-26-000055Jun 11, 2026 9:21 PM
184Insider Transaction0000875045-26-000054Jun 11, 2026 9:17 PM
194Insider Transaction0000875045-26-000052Jun 11, 2026 9:09 PM
208-KCurrent Report0000950157-26-000700Jun 10, 2026 8:54 PM
218-KCurrent Report0000950157-26-000699Jun 10, 2026 8:49 PM
22SCHEDULE 13GBeneficial Ownership Report0000315066-26-001417Jun 5, 2026 2:13 PM
23SCHEDULE 13D/AOthers0000950157-26-000611May 14, 2026 4:36 PM-
248-KCurrent Report0001193125-26-222908May 14, 2026 8:31 AM-
25SC TO-T/AOthers0001193125-26-222837May 14, 2026 7:53 AM-
26SC TO-T/AOthers0000950157-26-000594May 12, 2026 7:06 AM
27SCHEDULE 13GBeneficial Ownership Report0000315066-26-001103May 6, 2026 3:00 PM
28SCHEDULE 13GBeneficial Ownership Report0000315066-26-001103May 6, 2026 3:00 PM
294Insider Transaction0000875045-26-000046May 5, 2026 8:11 PM
304Insider Transaction0000875045-26-000046May 5, 2026 8:11 PM
31SCHEDULE 13GBeneficial Ownership Report0002100119-26-000210Apr 29, 2026 9:00 PM
3210-QQuarterly & Annual Report0000875045-26-000045Apr 29, 2026 10:40 AM
338-KCurrent Report0000875045-26-000042Apr 29, 2026 10:05 AM
34ARSOthers0001193125-26-187407Apr 28, 2026 8:47 PM
35DEFA14AOthers0001193125-26-187383Apr 28, 2026 8:42 PM
36DEF 14AOthers0001193125-26-187303Apr 28, 2026 8:34 PM
37SC TO-TOthers0001193125-26-153814Apr 14, 2026 11:02 AM
38SC TO-COthers0000950157-26-000483Apr 7, 2026 9:05 PM
393Insider Transaction0000950157-26-000479Apr 6, 2026 10:11 PM
40SCHEDULE 13DBeneficial Ownership Report0000950157-26-000478Apr 6, 2026 10:08 PM
418-KCurrent Report0000875045-26-000039Apr 6, 2026 10:31 AM
42SC TO-COthers0000950157-26-000473Apr 3, 2026 9:10 PM
434Insider Transaction0000875045-26-000036Apr 3, 2026 8:05 PM
444Insider Transaction0000875045-26-000036Apr 3, 2026 8:05 PM
454Insider Transaction0000875045-26-000036Apr 3, 2026 8:05 PM
46SC TO-COthers0001193125-26-134910Mar 31, 2026 9:08 PM
478-KCurrent Report0001193125-26-134889Mar 31, 2026 9:03 PM
48SC TO-COthers0000950157-26-000452Mar 31, 2026 9:01 PM
49SCHEDULE 13GBeneficial Ownership Report0000102909-26-000745Mar 26, 2026 8:09 PM
508-KCurrent Report0000950157-26-000280Mar 11, 2026 9:28 PM
...

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