Adam Keeney - 06 Feb 2026 Form 4 Insider Report for BIOGEN INC. (BIIB)

Role
Head of Corporate Development
Signature
/s/ Wendell Taylor, attorney-in-fact for Mr. Keeney
Issuer symbol
BIIB
Transactions as of
06 Feb 2026
Net transactions value
-$318,468
Form type
4
Filing time
10 Feb 2026, 17:01:16 UTC
Previous filing
05 May 2025
Next filing
17 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Keeney Adam Head of Corporate Development BIOGEN INC., 225 BINNEY STREET, CAMBRIDGE /s/ Wendell Taylor, attorney-in-fact for Mr. Keeney 10 Feb 2026 0001973607

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction BIIB Common Stock Options Exercise $0 +1,802 +76% $0.000000 4,186 06 Feb 2026 Direct
transaction BIIB Common Stock Tax liability $118,495 -589 -14% $201.18 3,597 06 Feb 2026 Direct
transaction BIIB Common Stock Options Exercise $0 +3,278 +91% $0.000000 6,875 06 Feb 2026 Direct
transaction BIIB Common Stock Tax liability $199,973 -994 -14% $201.18 5,881 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 -1,802 -50% $0.000000 1,802 06 Feb 2026 Common Stock 1,802 $0.000000 Direct F1
transaction BIIB Restricted Stock Unit Options Exercise $0 -3,278 -33% $0.000000 6,557 06 Feb 2026 Common Stock 3,278 $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.