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BIIB US
Biogen Inc.
(BIIB US)
$250.69
-3.15
1.24%
Ext:
$245.05
-5.64
2.25%
(Market Closed · 23:55:35 UTC)
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SEC Filings
Select Filings
Ask in Filing
Financials
(127)
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10-Q
Q2
ended 30 Jun 2026
29 Jul
10-Q
Q1
ended 31 Mar 2026
29 Apr
10-K
FY 2025
ended 31 Dec 2025
6 Feb
10-Q
Q3
ended 30 Sept 2025
30 Oct 2025
10-Q
Q2
ended 30 Jun 2025
31 Jul 2025
10-Q
Q1
ended 31 Mar 2025
1 May 2025
10-K
FY 2024
ended 31 Dec 2024
12 Feb 2025
10-Q
Q3
ended 30 Sept 2024
30 Oct 2024
10-Q
Q2
ended 30 Jun 2024
1 Aug 2024
10-Q
Q1
ended 31 Mar 2024
24 Apr 2024
10-K
FY 2023
ended 31 Dec 2023
14 Feb 2024
10-Q
Q3
ended 30 Sept 2023
8 Nov 2023
10-Q
Q2
ended 30 Jun 2023
25 Jul 2023
10-Q
Q1
ended 31 Mar 2023
25 Apr 2023
10-K
FY 2022
ended 31 Dec 2022
15 Feb 2023
Events
(297)
Expand
8-K
Results of Operations and Financial Condition
29 Jul
8-K
Results of Operations and Financial Condition
1 Jul
8-K
Submission of Matters to a Vote of Security Holders
10 Jun
8-K/A
Financial Statements and Exhibits
10 Jun
8-K
Biogen Completes Acquisition of Apellis Pharmaceuticals
14 May
8-K
Results of Operations and Financial Condition
29 Apr
8-K
Results of Operations and Financial Condition
6 Apr
8-K
TENDER AND SUPPORT AGREEMENT
31 Mar
8-K
Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers
11 Mar
8-K
Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers
11 Feb
8-K
Results of Operations and Financial Condition
6 Feb
8-K
Results of Operations and Financial Condition
13 Jan
8-K
Results of Operations and Financial Condition
30 Oct 2025
8-K
Results of Operations and Financial Condition
14 Oct 2025
8-K
Results of Operations and Financial Condition
31 Jul 2025
Insider Ownership
(1.7K)
Expand
4
Godbout Sean
5 Oct
4
Parini Michael
3 Sep
3
Parini Michael
12 Aug
4
Minor Lloyd
5 Aug
4
HAWKINS WILLIAM A
11 Jun
4
SHERWIN STEPHEN A
11 Jun
4
Rowinsky Eric K
11 Jun
4
Mantas Jesus B
11 Jun
4
LANGER SUSAN
11 Jun
4
Patolawala Monish D
11 Jun
4
Pangalos Menelas N
11 Jun
4
Minor Lloyd
11 Jun
4
Freire Maria C
11 Jun
4
Keeney Adam
5 May
3
BIOGEN INC.
6 Apr
Beneficial Ownership
(205)
Expand
SC 13G/A
BIOGEN INC.
6 Aug
SC 13G/A
BIOGEN INC.
5 Jun
SC 13D/A
Apellis Pharmaceuticals, Inc.
14 May
SC 13G/A
BIOGEN INC.
6 May
SC 13G
BIOGEN INC.
29 Apr
SC 13D
Apellis Pharmaceuticals, Inc.
6 Apr
SC 13G/A
BIOGEN INC.
26 Mar
SC 13G
BIOGEN INC.
5 Feb
SC 13G/A
BIOGEN INC.
13 Nov 2025
SC 13G
BIOGEN INC.
10 Nov 2025
SC 13D/A
Sage Therapeutics, Inc.
30 Jul 2025
SC 13D/A
Sage Therapeutics, Inc.
21 Jul 2025
SC 13G/A
BIOGEN INC.
17 Apr 2025
SC 13D
Sage Therapeutics, Inc.
10 Jan 2025
SC 13G/A
BIOGEN INC.
12 Nov 2024
Other Ownership
(22)
Expand
144
Minor Lloyd
4 Aug
144
Minor Lloyd
3 Aug
144
Singhal Priya
9 Feb
144
Singhal Priya
2 Feb
144
Singhal Priya
2 Sep 2025
144
Izzar Rachid
8 Jul 2025
144
Singhal Priya
19 May 2025
144
SHERWIN STEPHEN A
7 Mar 2025
144
Singhal Priya
9 Dec 2024
144
Singhal Priya
3 Sep 2024
144
Singhal Priya
2 Apr 2024
144
Singhal Priya
22 Feb 2024
144
Singhal Priya
21 Feb 2024
144
Singhal Priya
12 Feb 2024
144
Singhal Priya
2 Feb 2024
Proxies
(167)
Expand
ARS
Annual report to security holders
28 Apr
DEFA14A
Definitive additional materials
28 Apr
DEF 14A
Definitive proxy statement
28 Apr
DEFA14A
Definitive additional materials
2 Jun 2025
DEFA14A
Definitive additional materials
28 Apr 2025
DEF 14A
Definitive proxy statement
28 Apr 2025
ARS
Annual report to security holders
28 Apr 2025
DEF 14A
Definitive proxy statement
26 Apr 2024
DEFA14A
Definitive additional materials
26 Apr 2024
ARS
Annual report to security holders
26 Apr 2024
PRE 14A
Preliminary proxy statement
12 Apr 2024
DEFA14A
Definitive additional materials
31 Jul 2023
DEFA14A
Definitive additional materials
28 Jul 2023
DEFA14A
Definitive additional materials
13 Jun 2023
DEFR14A
Definitive revised proxy statement
13 Jun 2023
Registrations
(98)
Expand
424B2
Prospectus filing (Rule 424(b)(2))
8 May 2025
424B2
Prospectus filing (Rule 424(b)(2))
6 May 2025
FWP
Free writing prospectus
6 May 2025
S-3ASR
Automatic shelf registration statement (S-3)
1 May 2025
S-8
Registration statement (employee benefit plan)
20 Jun 2024
POS AM
Post-effective amendment (unspecified)
6 Jul 2022
424B3
Prospectus filing (Rule 424(b)(3))
26 May 2022
S-4
Registration statement (business combination)
17 May 2022
424B2
Prospectus filing (Rule 424(b)(2))
27 Apr 2020
S-3ASR
Automatic shelf registration statement (S-3)
24 Apr 2020
S-8
Registration statement (employee benefit plan)
16 Jun 2017
FWP
Free writing prospectus
11 Sep 2015
424B2
424(B)(2)
11 Sep 2015
424B2
Prospectus filing (Rule 424(b)(2))
10 Sep 2015
S-3ASR
Automatic shelf registration statement (S-3)
8 Sep 2015
Filing Review Correspondence
(15)
Expand
CORRESP
Filing review correspondence
24 May 2022
CORRESP
Filing review correspondence
21 Jun 2021
CORRESP
Filing review correspondence
9 Jun 2021
CORRESP
Filing review correspondence
7 Apr 2021
CORRESP
Filing review correspondence
28 Jun 2018
CORRESP
Filing review correspondence
10 May 2017
CORRESP
Filing review correspondence
4 Apr 2017
UPLOAD
Filing review upload
22 Apr 2009
UPLOAD
Filing review upload
17 Apr 2009
UPLOAD
Filing review upload
10 Apr 2009
UPLOAD
Filing review upload
28 Apr 2008
UPLOAD
Filing review upload
28 Apr 2008
CORRESP
Filing review correspondence
2 Apr 2008
UPLOAD
Filing review upload
22 Mar 2008
UPLOAD
Filing review upload
17 Jan 2007
SEC Orders And Notices
(5)
Expand
EFFECT
Notice of effectiveness
12 Jul 2022
EFFECT
Notice of effectiveness
26 May 2022
CT ORDER
Confidential treatment order
29 Mar 2016
CT ORDER
Confidential treatment order
29 Apr 2013
CT ORDER
Confidential treatment order
15 Mar 2011
Tender Offers And Going Private
(21)
Expand
SC TO-T/A
Tender offer statement (third-party, amendment)
14 May
SC TO-T/A
AMENDMENT NO. 2
12 May
SC TO-T/A
AMENDMENT NO. 1
6 May
SC TO-T
Tender offer statement (third-party)
14 Apr
SC TO-C
SCHEDULE TO
7 Apr
SC TO-C
SCHEDULE TO
3 Apr
SC TO-C
Tender offer statement (communication)
31 Mar
SC TO-C
SCHEDULE TO
31 Mar
SC TO-T/A
Tender offer statement (third-party, amendment)
17 Dec 2009
SC TO-T/A
Tender offer statement (third-party, amendment)
15 Dec 2009
SC TO-T/A
Tender offer statement (third-party, amendment)
11 Dec 2009
SC TO-T/A
Tender offer statement (third-party, amendment)
3 Dec 2009
SC TO-T/A
Tender offer statement (third-party, amendment)
16 Oct 2009
SC TO-T/A
Tender offer statement (third-party, amendment)
7 Oct 2009
SC TO-T/A
BIOGEN IDEC INC.
22 Sep 2009
Other
(9)
Expand
NO ACT
AUTO-GENERATED PAPER DOCUMENT
23 Feb 2017
NO ACT
AUTO-GENERATED PAPER DOCUMENT
13 Mar 2012
PRES14A
PRES14A
21 Oct 1999
10-K405
10-K405
31 Mar 1999
10-K405/A
10-K405/A
3 Mar 1998
10-K405
10-K405
27 Feb 1998
8-B12G
8-B12G
2 Jun 1997
10-K405
10-K405
31 Mar 1997
10-C
10-C
21 Jun 1996
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