Key facts
- This page summarizes Christopher Viehbacher's Form 4 filing for BIOGEN INC. (BIIB).
- 6 reported transactions and 2 derivative rows are listed below.
- Accepted by SEC: 10 Feb 2026, 17:06.
Christopher Viehbacher - 06 Feb 2026 Form 4 Insider Report for BIOGEN INC. (BIIB)
- Reporting relationship
- President and CEO, Director
- Issuer ticker
- BIIB
- Reported as of
- 06 Feb 2026
- Net transaction value
- -$2,208,956
- SEC form
- 4
- Accepted by SEC
- 10 Feb 2026, 17:06:49 UTC
- Prior SEC filing
- 03 Dec 2025
- Next SEC filing
- 17 Feb 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Wendell Taylor, attorney-in-fact for Christopher A. Viehbacher
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Christopher Viehbacher filed Form 4 for BIOGEN INC. (BIIB) on 10 Feb 2026.
Change
- Previous filing in this sequence was filed on 03 Dec 2025.
- Current net transaction value: -$2,208,956.
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 0001774478
Primary reporting owner
Viehbacher Christopher
- Relationship
- President and CEO, Director
- Address
- BIOGEN INC., 225 BINNEY, CAMBRIDGE
- Signature
- /s/ Wendell Taylor, attorney-in-fact for Christopher A. Viehbacher
- 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
- +9,008
- Change %
- +55%
- Price
- $0.000000
- Shares after
- 25,451
- Date
- 06 Feb 2026
- Ownership
- Direct
BIIB
transaction
Common Stock
Tax liability
- Transaction value
- $876,340
- Shares
- -4,356
- Change %
- -17%
- Price
- $201.18
- Shares after
- 21,095
- Date
- 06 Feb 2026
- Ownership
- Direct
BIIB
transaction
Common Stock
Options Exercise
- Transaction value
- $0
- Shares
- +15,453
- Change %
- +73%
- Price
- $0.000000
- Shares after
- 36,548
- Date
- 06 Feb 2026
- Ownership
- Direct
BIIB
transaction
Common Stock
Tax liability
- Transaction value
- $1,332,616
- Shares
- -6,624
- Change %
- -18%
- Price
- $201.18
- Shares after
- 29,924
- 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
- -9,008
- Change %
- -50%
- Price
- $0.000000
- Shares after
- 9,009
- Date
- 06 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 9,008
- Exercise price
- $0.000000
- Footnotes
- F1
BIIB
transaction
Derivative
Restricted Stock Unit
Options Exercise
- Transaction value
- $0
- Shares
- -15,453
- Change %
- -33%
- Price
- $0.000000
- Shares after
- 30,907
- Date
- 06 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 15,453
- Exercise price
- $0.000000
- Footnotes
- F2
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 2 footnotes
Footnote F1
The restricted stock units vest in three (3) equal annual installments, commencing one year after the grant date of 02/07/2024.
Footnote F2
The restricted stock units vest in three equal yearly installments beginning on the first anniversary of the grant date of February 6, 2025.