Jane Grogan - 31 Oct 2025 Form 4 Insider Report for BIOGEN INC. (BIIB)

Role
Head of Research
Signature
/s/ Wendell Taylor, attorney-in-fact for Dr. Grogan
Issuer symbol
BIIB
Transactions as of
31 Oct 2025
Net transactions value
-$51,989
Form type
4
Filing time
04 Nov 2025, 16:12:56 UTC
Previous filing
10 Feb 2025
Next filing
10 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Grogan Jane Head of Research 225 BINNEY, CAMBRIDGE /s/ Wendell Taylor, attorney-in-fact for Dr. Grogan 04 Nov 2025 0001995547

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction BIIB Common Stock Options Exercise $0 +695 +48% $0.000000 2,128 31 Oct 2025 Direct
transaction BIIB Common Stock Tax liability $51,989 -337 -16% $154.27 1,791 31 Oct 2025 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 -695 -50% $0.000000 695 31 Oct 2025 Common Stock 695 $0.000000 Direct F1
* 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 equal yearly installments beginning on the first anniversary of the grant date of November 1, 2023.