Biogen grants Sean Godbout 985 stock units

The chief accounting officer's new restricted stock units vest in three equal yearly installments beginning on the first anniversary of the October 1, 2026 grant.

Rhea-AI Filing Summary

Biogen Chief Accounting Officer Sean Godbout reported converting 27 restricted stock units into 27 common shares on October 2, 2026. On the same date, 8 shares were delivered or withheld for payment of exercise price or tax liability. He also acquired 985 restricted stock units on October 1, 2026; those units vest in three equal yearly installments beginning on the first anniversary of the grant. The converted units were scheduled to vest in three equal yearly installments beginning on the first anniversary of their October 2, 2023 grant.

Insider Trade Summary

27 shares exercised/converted

Exercise 4 txns

Insider Godbout Sean

Role Chief Accounting Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit F3	27	$0.00	$0.00
Exercise	Common Stock F1	27	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	8	$219.88	$2K
Grant/Award	Restricted Stock Unit F2	985	$0.00	$0.00

Holdings After Transaction: Restricted Stock Unit — 985 contracts (Direct); Common Stock — 1,458.9845 shares (Direct)

Footnotes (3)

1. F1. Includes 98.3178 shares acquired under the Biogen Inc. employee stock purchase plan on 3/31/2026, 6/30/2026, and 9/30/2026.
2. F2. The restricted stock units vest in three equal yearly installments beginning on the first anniversary of the grant date of October 1, 2026.
3. F3. The restricted stock units vest in three equal yearly installments beginning on the first anniversary of the grant date of October 2, 2023.

Key Figures

Restricted stock units converted: 27 restricted stock units Common shares acquired: 27 common shares Shares delivered or withheld: 8 shares +1 more

4 metrics

Restricted stock units converted 27 restricted stock units October 2, 2026

Common shares acquired 27 common shares October 2, 2026

Shares delivered or withheld 8 shares For payment of exercise price or tax liability on October 2, 2026

Restricted stock units granted 985 restricted stock units Grant dated October 1, 2026

Key Terms

Restricted Stock Unit, employee stock purchase plan, vest

3 terms

Restricted Stock Unit financial

"The restricted stock units vest in three equal yearly installments"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

employee stock purchase plan financial

"acquired under the Biogen Inc. employee stock purchase plan"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

vest financial

"vest in three equal yearly installments"

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many BIIB shares did Sean Godbout receive from restricted stock units?

Sean Godbout converted 27 restricted stock units into 27 common shares on October 2, 2026. On that date, 8 shares were also delivered or withheld for payment of exercise price or tax liability.

When do Sean Godbout's new BIIB restricted stock units vest?

Sean Godbout was granted 985 restricted stock units on October 1, 2026. They vest in three equal yearly installments beginning on the first anniversary of the grant.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/05/2026 - 05:01 PM Accepted by SEC EDGAR 10/05/2026 - 05:00 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a 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). See Instruction 10.

1. Name and Address of Reporting Person^*

Godbout Sean

(Last) (First) (Middle)

225 BINNEY

(Street)

CAMBRIDGE MASSACHUSETTS 02142

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
BIOGEN INC. [ BIIB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Accounting Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/02/2026		M		27	A	$0	1,466.9845(1)	D
Common Stock	10/02/2026		F		8	D	$219.88	1,458.9845	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Unit	$0	10/01/2026		A		985		(2)	10/01/2029	Common Stock	985	$0	985	D
Restricted Stock Unit	$0	10/02/2026		M			27	(3)	10/02/2026	Common Stock	27	$0	0	D

Explanation of Responses:

1. Includes 98.3178 shares acquired under the Biogen Inc. employee stock purchase plan on 3/31/2026, 6/30/2026, and 9/30/2026.

2. The restricted stock units vest in three equal yearly installments beginning on the first anniversary of the grant date of October 1, 2026.

3. The restricted stock units vest in three equal yearly installments beginning on the first anniversary of the grant date of October 2, 2023.

Remarks:

Power of Attorney is attached hereto as Exhibit 24.

	/s/ Bryan Keighery, attorney-in-fact for Mr. Godbout	10/05/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)