Christopher A. Viehbacher - 06 Feb 2026 Form 4 Insider Report for BIOGEN INC. (BIIB)

Role
President and CEO, Director
Signature
/s/ Wendell Taylor, attorney-in-fact for Christopher A. Viehbacher
Issuer symbol
BIIB
Transactions as of
06 Feb 2026
Net transactions value
-$2,208,956
Form type
4
Filing time
10 Feb 2026, 17:06:49 UTC
Previous filing
03 Dec 2025
Next filing
17 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Viehbacher Christopher President and CEO, Director BIOGEN INC., 225 BINNEY, CAMBRIDGE /s/ Wendell Taylor, attorney-in-fact for Christopher A. Viehbacher 10 Feb 2026 0001774478

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction BIIB Common Stock Options Exercise $0 +9,008 +55% $0.000000 25,451 06 Feb 2026 Direct
transaction BIIB Common Stock Tax liability $876,340 -4,356 -17% $201.18 21,095 06 Feb 2026 Direct
transaction BIIB Common Stock Options Exercise $0 +15,453 +73% $0.000000 36,548 06 Feb 2026 Direct
transaction BIIB Common Stock Tax liability $1,332,616 -6,624 -18% $201.18 29,924 06 Feb 2026 Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction BIIB Restricted Stock Unit Options Exercise $0 -9,008 -50% $0.000000 9,009 06 Feb 2026 Common Stock 9,008 $0.000000 Direct F1
transaction BIIB Restricted Stock Unit Options Exercise $0 -15,453 -33% $0.000000 30,907 06 Feb 2026 Common Stock 15,453 $0.000000 Direct F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The restricted stock units vest in three (3) equal annual installments, commencing one year after the grant date of 02/07/2024.
F2 The restricted stock units vest in three equal yearly installments beginning on the first anniversary of the grant date of February 6, 2025.