Generation Bio (GBIO) chief legal officer reports RSU vesting and share sale

Rhea-AI Filing Summary

Generation Bio Co. chief legal officer Yalonda Howze reported equity award activity involving company stock. On January 15, 2026, 335 restricted stock units vested and were converted into 335 shares of common stock at an exercise price of $0. After this transaction, she directly held 2,680 shares of Generation Bio common stock.

On the same date, she disposed of 99 shares of common stock in a transaction coded "F" at a price of $5.64 per share, typically used to indicate shares withheld or sold to cover taxes. Following these transactions, she directly owned 2,581 shares of common stock and 1,673 restricted stock units. Each restricted stock unit represents the right to receive one share of common stock, and the original 53,550-unit grant from April 5, 2023 vests over four years with an initial 25% vesting on April 15, 2024 and the remainder vesting in equal quarterly installments.

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

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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^*

Howze Yalonda

(Last) (First) (Middle)

C/O GENERATION BIO CO.

301 BINNEY STREET, SUITE 401

(Street)

CAMBRIDGE MA 02142

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Generation Bio Co. [ GBIO ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CHIEF LEGAL OFFICER

3. Date of Earliest Transaction (Month/Day/Year)
01/15/2026

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

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

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

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	01/15/2026		M		335	A	(1)	2,680	D
Common Stock	01/15/2026		F		99	D	$5.64	2,581	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 Units	(1)	01/15/2026		M			335	(2)	(2)	Common Stock	335	$0	1,673	D

Explanation of Responses:

1. Each restricted stock unit represents the right to receive one share of the company's common stock.

2. The grant of 53,550 restricted stock units was made on April 5, 2023. The shares underlying the restricted stock units vest over four years, with 25% of the shares vested on April 15, 2024 and the remaining shares vesting in equal quarterly installments thereafter.

	/s/ Shawna-Gay White, Attorney-in-Fact	01/16/2026
	** 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.

FAQ

What insider transaction did GBIO's chief legal officer report?

Generation Bio Co.'s chief legal officer, Yalonda Howze, reported vesting of 335 restricted stock units into common stock and the disposition of 99 shares of common stock on January 15, 2026.

How many Generation Bio (GBIO) shares does the insider own after this Form 4?

After the reported transactions, the insider directly owned 2,581 shares of Generation Bio common stock and 1,673 restricted stock units, each unit representing the right to receive one share of common stock.

What is the significance of the transaction codes M and F in this GBIO Form 4?

The code "M" indicates the exercise or conversion of 335 restricted stock units into common stock at an exercise price of $0. The code "F" for 99 shares of common stock at $5.64 per share typically denotes shares withheld or sold to satisfy tax obligations related to the equity award.

What are the terms of the GBIO restricted stock units held by the insider?

The insider received a grant of 53,550 restricted stock units on April 5, 2023. These units vest over four years: 25% vested on April 15, 2024, and the remaining units vest in equal quarterly installments thereafter. Each restricted stock unit represents the right to receive one share of Generation Bio common stock.

Is the GBIO Form 4 transaction a direct or indirect ownership change?

All reported holdings and transactions in this Form 4 are classified as direct ownership by the insider, with no indicated indirect ownership through other entities.

Who filed this Form 4 for Generation Bio Co. and in what capacity?

The Form 4 was filed for Yalonda Howze, who serves as chief legal officer of Generation Bio Co. The form reports her personal equity award activity in company securities.