Priya Singhal - Apr 4, 2023 Form 4 Insider Report for BIOGEN INC. (BIIB)

Role: Head of Development
Signature: /s/ Wendell Taylor, attorney-in-fact for Priya Singhal
Stock symbol: BIIB
Transactions as of: Apr 4, 2023
Transactions value $: -$25,217
Form type: 4
Date filed: 4/6/2023, 06:37 PM
Previous filing: Mar 30, 2023
Next filing: Jul 5, 2023

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	BIIB	Common Stock	Sale	-$25.2K	-91	-3.1%	$277.11	2.84K	Apr 4, 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.