Key facts
- This page summarizes Susan H. Alexander's Form 4 filing for BIOGEN INC. (BIIB).
- 9 reported transactions and 3 derivative rows are listed below.
- Accepted by SEC: 10 Feb 2026, 16:55.
Susan H. Alexander - 06 Feb 2026 Form 4 Insider Report for BIOGEN INC. (BIIB)
- Reporting relationship
- EVP Chief Legal Officer
- Issuer ticker
- BIIB
- Reported as of
- 06 Feb 2026
- Net transaction value
- -$704,935
- SEC form
- 4
- Accepted by SEC
- 10 Feb 2026, 16:55:45 UTC
- Prior SEC filing
- 12 Feb 2025
- Next SEC filing
- 17 Feb 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Wendell Taylor, attorney-in-fact for Susan Alexander
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Susan H. Alexander filed Form 4 for BIOGEN INC. (BIIB) on 10 Feb 2026.
Change
- Previous filing in this sequence was filed on 12 Feb 2025.
- Current net transaction value: -$704,935.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001263839
Primary reporting owner
ALEXANDER SUSAN H
- Relationship
- EVP Chief Legal Officer
- Address
- BIOGEN INC., 225 BINNEY STREET, CAMBRIDGE
- Signature
- /s/ Wendell Taylor, attorney-in-fact for Susan Alexander
- Signature date
- 10 Feb 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
BIIB
transaction
Common Stock
Options Exercise
- Transaction value
- $0
- Shares
- +2,190
- Change %
- +6%
- Price
- $0.000000
- Shares after
- 38,455
- Date
- 06 Feb 2026
- Ownership
- Direct
BIIB
transaction
Common Stock
Tax liability
- Transaction value
- $213,050
- Shares
- -1,059
- Change %
- -2.8%
- Price
- $201.18
- Shares after
- 37,396
- Date
- 06 Feb 2026
- Ownership
- Direct
BIIB
transaction
Common Stock
Options Exercise
- Transaction value
- $0
- Shares
- +1,940
- Change %
- +5.2%
- Price
- $0.000000
- Shares after
- 39,336
- Date
- 06 Feb 2026
- Ownership
- Direct
BIIB
transaction
Common Stock
Tax liability
- Transaction value
- $187,299
- Shares
- -931
- Change %
- -2.4%
- Price
- $201.18
- Shares after
- 38,405
- Date
- 06 Feb 2026
- Ownership
- Direct
BIIB
transaction
Common Stock
Options Exercise
- Transaction value
- $0
- Shares
- +4,916
- Change %
- +13%
- Price
- $0.000000
- Shares after
- 43,321
- Date
- 06 Feb 2026
- Ownership
- Direct
BIIB
transaction
Common Stock
Tax liability
- Transaction value
- $304,587
- Shares
- -1,514
- Change %
- -3.5%
- Price
- $201.18
- Shares after
- 41,807
- Date
- 06 Feb 2026
- Ownership
- Direct
BIIB
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 20,082
- Date
- 06 Feb 2026
- Ownership
- Susan H. Alexander 2021 Irrevocable Trust
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
BIIB
transaction
Derivative
Restricted Stock Unit
Options Exercise
- Transaction value
- $0
- Shares
- -2,190
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 06 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 2,190
- Exercise price
- $0.000000
- Footnotes
- F1
BIIB
transaction
Derivative
Restricted Stock Unit
Options Exercise
- Transaction value
- $0
- Shares
- -1,940
- Change %
- -50%
- Price
- $0.000000
- Shares after
- 1,940
- Date
- 06 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 1,940
- Exercise price
- $0.000000
- Footnotes
- F2
BIIB
transaction
Derivative
Restricted Stock Unit
Options Exercise
- Transaction value
- $0
- Shares
- -4,916
- Change %
- -33%
- Price
- $0.000000
- Shares after
- 9,834
- Date
- 06 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 4,916
- Exercise price
- $0.000000
- Footnotes
- F3
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 3 footnotes
Footnote F1
The restricted stock units vest in three (3) equal annual installments commencing one year after the grant date of 2/8/2023.
Footnote F2
The restricted stock units vest in three (3) equal annual installments, commencing one year after the grant date of 02/07/2024.
Footnote F3
The restricted stock units vest in three equal yearly installments beginning on the first anniversary of the grant date of February 6, 2025.