Walter Marc Hertz - 18 Sep 2025 Form 4 Insider Report for GRI Bio, Inc. (GRI)

Role: Chief Executive Officer, Director
Signature: /s/ Leanne Kelly, Attorney-in-Fact
Issuer symbol: GRI
Transactions as of: 18 Sep 2025
Net transactions value: $0
Form type: 4
Filing time: 22 Sep 2025, 16:05:36 UTC
Previous filing: 27 Aug 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Hertz Walter Marc	Chief Executive Officer, Director	C/O GRI BIO, INC., 2223 AVENIDA DE LA PLAYA, SUITE 208, LA JOLLA	/s/ Leanne Kelly, Attorney-in-Fact	22 Sep 2025	0001971132

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	GRI	Stock Option (Right to Buy)	Award	$0	+103,067		$0.000000	103,067	18 Sep 2025	Common Stock	103,067	$1.93	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Options to purchase 76,469 shares vested in full upon the date of grant and options to purchase 26,598 shares will vest in 12 substantially equal quarterly installments such that the stock option is fully vested on the third anniversary of the date of grant.