144 0001678152 XXXXXXXX LIVE 0001746466 Equillium, Inc. 001-38692 2223 AVENIDA DE LA PLAYA SUITE 105 LA JOLLA CA 92037 (858) 412-5302 Keyes Jason A Former CFO Common Stock Maxim Group

300 Park Ave 16th Floor New York NY 10022

88913 28452.16 35719317 07/07/2025 NASDAQ Common Stock 06/29/2018 Employee Stock Purchase Plan Issuer N 88913 07/07/2025 Cash N Jason Andrew Keyes

2223 Avenida de la Playa, Suite 105 La Jolla CA 92037

Common Stock 06/12/2025 10000 3860.00 07/08/2025 /s/ Dominick Iadicicco, as a duly authorized representative of Maxim Group LLC, as attorney-in-fact for Jason Keys