BIOGEN INC. - BIIB

All tracked SEC files for this issuer. Showing up to 200 latest records.
Need parsed ownership details (13D/13G with shares/percent)? Open ownership details
Form 4 = insider transactions report. Form 144 = notice of proposed sale (not a completed trade confirmation).

Files summary

Total files loaded: 29
Latest filed: Aug 06, 2026
Form Count
4 12
8-K 8
SCHEDULE 13G/A 4
144 2
8-K/A 1
SCHEDULE 13G 1
SCHEDULE 13D 1

Latest files

Filed Form Report period Accession SEC
Aug 06, 2026 SCHEDULE 13G/A 0000315066-26-001959 View
Aug 05, 2026 4 Aug 03, 2026 0000875045-26-000076 View
Aug 04, 2026 144 0001959173-26-005582 View
Aug 03, 2026 144 0001959173-26-005518 View
Jul 29, 2026 8-K Jul 29, 2026 0000875045-26-000073 View
Jul 01, 2026 8-K Jul 01, 2026 0000875045-26-000068 View
Jun 11, 2026 4 Jun 09, 2026 0000875045-26-000059 View
Jun 11, 2026 4 Jun 09, 2026 0000875045-26-000060 View
Jun 11, 2026 4 Jun 09, 2026 0000875045-26-000062 View
Jun 11, 2026 4 Jun 09, 2026 0000875045-26-000063 View
Jun 11, 2026 4 Jun 09, 2026 0000875045-26-000064 View
Jun 11, 2026 4 Jun 09, 2026 0000875045-26-000065 View
Jun 11, 2026 4 Jun 09, 2026 0000875045-26-000052 View
Jun 11, 2026 4 Jun 09, 2026 0000875045-26-000054 View
Jun 11, 2026 4 Jun 09, 2026 0000875045-26-000055 View
Jun 10, 2026 8-K Jun 09, 2026 0000950157-26-000700 View
Jun 10, 2026 8-K/A May 14, 2026 0000950157-26-000699 View
Jun 05, 2026 SCHEDULE 13G/A 0000315066-26-001417 View
May 14, 2026 8-K May 14, 2026 0001193125-26-222908 View
May 06, 2026 SCHEDULE 13G/A 0000315066-26-001103 View
May 05, 2026 4 May 01, 2026 0000875045-26-000046 View
Apr 29, 2026 SCHEDULE 13G 0002100119-26-000210 View
Apr 29, 2026 8-K Apr 29, 2026 0000875045-26-000042 View
Apr 06, 2026 SCHEDULE 13D 0000950157-26-000478 View
Apr 06, 2026 8-K Apr 06, 2026 0000875045-26-000039 View
Apr 03, 2026 4 Apr 01, 2026 0000875045-26-000036 View
Mar 31, 2026 8-K Mar 31, 2026 0001193125-26-134889 View
Mar 26, 2026 SCHEDULE 13G/A 0000102909-26-000745 View
Mar 11, 2026 8-K Mar 11, 2026 0000950157-26-000280 View