Priya Singhal - 29 Aug 2025 Form 4 Insider Report for BIOGEN INC. (BIIB)

Role
Head of Development
Signature
/s/ Wendell Taylor, attorney-in-fact for Priya Singhal
Issuer symbol
BIIB
Transactions as of
29 Aug 2025
Net transactions value
-$175,747
Form type
4
Filing time
02 Sep 2025, 17:56:03 UTC
Previous filing
20 May 2025
Next filing
03 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Singhal Priya Head of Development 225 BINNEY, CAMBRIDGE /s/ Wendell Taylor, attorney-in-fact for Priya Singhal 02 Sep 2025 0001769608

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction BIIB Common Stock Options Exercise $0 +1,669 +31% $0.000000 7,096 29 Aug 2025 Direct
transaction BIIB Common Stock Tax liability $106,702 -807 -11% $132.22 6,289 29 Aug 2025 Direct
transaction BIIB Common Stock Sale $69,045 -517 -8.2% $133.55 5,772 02 Sep 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 -1,669 -100% $0.000000 0 29 Aug 2025 Common Stock 1,669 $0.000000 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id Content
F1 This award was granted to the reporting person on September 1, 2022 and will vest in three equal installments on each anniversary of the grant date.