VALLON PHARMACEU(VLON) - Prospectus(update)

As filed with the Securities and Exchange Commission on December 9, 2025. Registration No. 333-291999 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 1 to FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 GRI BIO, INC. (Exact name of registrant as specified in its charter) (Primary Standard Industrial Classification Code Number) Delaware 2834 82-4369909 (I.R.S. Employer Identification Number) 2223 Avenida de la Playa, #208 La Jolla, CA 92037 (619) 400-117 ...