BIOGEN INC. (BIIB) - 13D/13G Filings

Real time Form 13D and 13G transaction reports:

  • Schedule 13D must be filed within ten days after a person or an organization acquires beneficial ownership of more than 5% of a voting class of a company's equity securities.
  • Due to inconsistent filing format, it is highly recommended that you read the orignal filing form.
  • Shares have beem adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
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Reported
DateTime
Transaction
Date
TypeCompany
Symbol
Filed By
Symbol
Shares Owned
% Owned
Shares Vs. Prev ReportView
2026-04-29
5:00 pm
Purchase
2026-03-3113GBIOGEN INC
BIIB
Vanguard Capital Management10,989,562
7.480%
10,989,562increase
(New Position)
Filing
History
2026-04-06
6:08 pm
Purchase
2026-03-3113DAPELLIS PHARMACEUTICALS INC CO
APLS
BIOGEN INC.
BIIB
18,469,475
14.200%
18,469,475increase
(New Position)
Filing
History
2026-03-26
4:09 pm
Sale
2026-03-1313GBIOGEN INC
BIIB
VANGUARD GROUP INC0
0.000%
-16,677,806decrease
(Position Closed)
Filing
History
2026-02-05
1:16 pm
Purchase
2025-12-3113GBIOGEN INC
BIIB
FMR LLC9,413,062
6.400%
1,001,699increase
(+11.91%)
Filing
History
2025-11-13
8:28 pm
Sale
2025-09-3013GBIOGEN INC
BIIB
PRIMECAP MANAGEMENT CO14,954,697
10.200%
-1,309,784decrease
(-8.05%)
Filing
History
2025-11-10
08:15 am
Sale
2025-09-3013GBIOGEN INC
BIIB
STATE STREET CORP
STT
7,321,168
5.000%
-25,337decrease
(-0.34%)
Filing
History
2025-07-30
5:56 pm
Sale
2025-07-3013DSAGE THERAPEUTICS INC
SAGE
BIOGEN INC.
BIIB
0
0.000%
-6,241,473decrease
(Position Closed)
Filing
History
2025-07-21
9:18 pm
Unchanged
2025-07-2113DSAGE THERAPEUTICS INC
SAGE
BIOGEN INC.
BIIB
6,241,473
10.000%
0
(Unchanged)
Filing
History
2025-04-17
09:35 am
Sale
2025-03-3113GBIOGEN INC
BIIB
BlackRock Inc.
BLK
12,506,681
8.500%
-2,140,070decrease
(-14.61%)
Filing
History
2025-01-10
5:34 pm
Unchanged
2025-01-1013DSAGE THERAPEUTICS INC
SAGE
BIOGEN INC.
BIIB
6,241,473
10.200%
0
(Unchanged)
Filing
History
2024-11-12
1:24 pm
Unchanged
2024-09-3013GBIOGEN INC
BIIB
VANGUARD GROUP INC16,677,806
11.440%
0
(Unchanged)
Filing
History
2024-11-07
4:48 pm
Sale
2024-10-3013GDENALI THERAPEUTICS INC
DNLI
BIOGEN INC.
BIIB
7,155,243
4.970%
-5,596,122decrease
(-43.89%)
Filing
History
2024-11-04
11:20 am
Purchase
2024-09-3013GBIOGEN INC
BIIB
VANGUARD GROUP INC16,677,806
11.440%
2,156,464increase
(+14.85%)
Filing
History
2024-10-16
12:11 pm
Purchase
2024-09-3013GBIOGEN INC
BIIB
STATE STREET CORP
STT
7,346,505
5.000%
7,346,505increase
(New Position)
Filing
History
2024-08-16
6:40 pm
Sale
2024-08-1413GSANGAMO THERAPEUTICS INC
SGMO
BIOGEN INC.
BIIB
3,250,000
1.600%
-11,402,466decrease
(-77.82%)
Filing
History
2024-08-07
4:10 pm
Purchase
2024-07-3113GBIOGEN INC
BIIB
BlackRock Inc.
BLK
14,646,751
10.100%
400,431increase
(+2.81%)
Filing
History
2024-02-12
7:11 pm
Sale
2023-12-3113GSANGAMO THERAPEUTICS INC
SGMO
BIOGEN INC.
BIIB
14,652,466
8.260%
-9,767,691decrease
(-40.00%)
Filing
History
2024-02-12
7:07 pm
Sale
2023-12-3113GDENALI THERAPEUTICS INC
DNLI
BIOGEN INC.
BIIB
12,751,365
9.230%
-558,878decrease
(-4.20%)
Filing
History
2024-02-12
4:01 pm
Purchase
2023-12-3113GBIOGEN INC
BIIB
PRIMECAP MANAGEMENT CO16,264,481
11.220%
563,905increase
(+3.59%)
Filing
History
2024-02-12
11:21 am
Purchase
2024-01-3113GBIOGEN INC
BIIB
VANGUARD GROUP INC14,521,342
10.020%
114,463increase
(+0.79%)
Filing
History
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