Yalonda Howze - 15 Jan 2026 Form 4 Insider Report for Generation Bio Co. (GBIO)

Role
CHIEF LEGAL OFFICER
Signature
/s/ Shawna-Gay White, Attorney-in-Fact
Issuer symbol
GBIO
Transactions as of
15 Jan 2026
Net transactions value
-$558
Form type
4
Filing time
16 Jan 2026, 16:05:09 UTC
Previous filing
17 Oct 2025
Next filing
04 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Howze Yalonda CHIEF LEGAL OFFICER C/O GENERATION BIO CO., 301 BINNEY STREET, SUITE 401, CAMBRIDGE /s/ Shawna-Gay White, Attorney-in-Fact 16 Jan 2026 0001828153

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction GBIO Common Stock Options Exercise +335 +14% 2,680 15 Jan 2026 Direct F1
transaction GBIO Common Stock Tax liability $558 -99 -3.7% $5.64 2,581 15 Jan 2026 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 GBIO Restricted Stock Units Options Exercise $0 -335 -17% $0.000000 1,673 15 Jan 2026 Common Stock 335 Direct F1, F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Each restricted stock unit represents the right to receive one share of the company's common stock.
F2 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.