Key facts
- This page summarizes Robin Kramer's Form 4 filing for BIOGEN INC. (BIIB).
- 9 reported transactions and 3 derivative rows are listed below.
- Accepted by SEC: 10 Feb 2026, 17:02.
Robin Kramer - 06 Feb 2026 Form 4 Insider Report for BIOGEN INC. (BIIB)
- Reporting relationship
- Chief Financial Officer
- Issuer ticker
- BIIB
- Reported as of
- 06 Feb 2026
- Net transaction value
- -$310,421
- SEC form
- 4
- Accepted by SEC
- 10 Feb 2026, 17:02:17 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 Robin Kramer
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Robin Kramer 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: -$310,421.
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 0001609222
Primary reporting owner
Kramer Robin
- Relationship
- Chief Financial Officer
- Address
- 225 BINNEY STREET, CAMBRIDGE
- Signature
- /s/ Wendell Taylor, attorney-in-fact for Robin Kramer
- 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
- +789
- Change %
- +9.8%
- Price
- $0.000000
- Shares after
- 8,801
- Date
- 06 Feb 2026
- Ownership
- Direct
BIIB
transaction
Common Stock
Tax liability
- Transaction value
- $54,922
- Shares
- -273
- Change %
- -3.1%
- Price
- $201.18
- Shares after
- 8,528
- Date
- 06 Feb 2026
- Ownership
- Direct
BIIB
transaction
Common Stock
Options Exercise
- Transaction value
- $0
- Shares
- +703
- Change %
- +8.2%
- Price
- $0.000000
- Shares after
- 9,231
- Date
- 06 Feb 2026
- Ownership
- Direct
BIIB
transaction
Common Stock
Tax liability
- Transaction value
- $41,644
- Shares
- -207
- Change %
- -2.2%
- Price
- $201.18
- Shares after
- 9,024
- Date
- 06 Feb 2026
- Ownership
- Direct
BIIB
transaction
Common Stock
Options Exercise
- Transaction value
- $0
- Shares
- +3,511
- Change %
- +39%
- Price
- $0.000000
- Shares after
- 12,535
- Date
- 06 Feb 2026
- Ownership
- Direct
BIIB
transaction
Common Stock
Tax liability
- Transaction value
- $213,854
- Shares
- -1,063
- Change %
- -8.5%
- Price
- $201.18
- Shares after
- 11,472
- Date
- 06 Feb 2026
- Ownership
- Direct
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
- -789
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 06 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 789
- Exercise price
- $0.000000
- Footnotes
- F1
BIIB
transaction
Derivative
Restricted Stock Unit
Options Exercise
- Transaction value
- $0
- Shares
- -703
- Change %
- -50%
- Price
- $0.000000
- Shares after
- 704
- Date
- 06 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 703
- Exercise price
- $0.000000
- Footnotes
- F2
BIIB
transaction
Derivative
Restricted Stock Unit
Options Exercise
- Transaction value
- $0
- Shares
- -3,511
- Change %
- -33%
- Price
- $0.000000
- Shares after
- 7,024
- Date
- 06 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 3,511
- 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 02/08/2023.
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.