UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 As filed with the Securities and Exchange Commission on December 21, 2023. Registration No. 333- GRI BIO, INC. (Exact name of registrant as specified in its charter) (Name, address, including zip code, and telephone number, including area code, of agent for service) Copies to: Adam Lenain, Esq. Melanie Ruthrauff Levy, Esq. Jason Miller, Esq. Mintz, Levin, Cohn, Ferris, Glo ...