Christopher Viehbacher - Dec 1, 2025 Form 4 Insider Report for BIOGEN INC. (BIIB)

Role
President and CEO, Director
Signature
/s/ Wendell Taylor, attorney-in-fact for Christopher A. Viehbacher
Stock symbol
BIIB
Transactions as of
Dec 1, 2025
Transactions value $
-$605,163
Form type
4
Date filed
12/3/2025, 04:42 PM
Previous filing
Feb 10, 2025
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 2025-12-03 0001774478

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction BIIB Common Stock Options Exercise $0 +7.04K +54.97% $0.00 19.8K Dec 1, 2025 Direct
transaction BIIB Common Stock Tax liability -$605K -3.4K -17.15% $177.78 16.4K Dec 1, 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 -7.04K -100% $0.00 0 Dec 1, 2025 Common Stock 7.04K Direct F1, F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Each Restricted Stock Unit ("RSU") represents the right to receive, at settlement, one share of common stock.
F2 Each RSU vested on the third anniversary of the grant date of December 1, 2022.