Ginger Gregory - 28 Apr 2023 Form 4 Insider Report for BIOGEN INC. (BIIB)

Role: EVP, Human Resources
Signature: /s/ Wendell Taylor, attorney in fact for Ginger Gregory
Issuer symbol: BIIB
Transactions as of: 28 Apr 2023
Net transactions value: -$804,300
Form type: 4
Filing time: 02 May 2023, 20:05:14 UTC
Previous filing: 22 Feb 2023
Next filing: 31 Jan 2024
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	BIIB	Common Stock	Sale	$804,300	-2,681	-24%	$300.00	8,483	28 Apr 2023	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	Includes 91.6992 shares acquired under the Biogen Inc. employee stock purchase plan on 3/31/2023.