144 0001797818 XXXXXXXX LIVE 0001746466 Equillium, Inc. 001-38692 2223 AVENIDA DE LA PLAYA SUITE 105 LA JOLLA CA 92037 (858) 412-5302 Zedelmayer Christine Officer Common Stock Maxim Group

300 Park Ave 16th Floor New York NY 10022

181219 320757.00 60893283 03/09/2026 NASDAQ Common Stock 04/22/2020 Stock Options Issuer N 152361 03/09/2026 Cash Common Stock 06/10/2021 Employee Stock Purchase Plan Issuer N 7925 03/09/2026 Cash Common Stock 06/10/2022 Employee Stock Purchase Plan Issuer N 9033 06/03/2023 Cash Common Stock 06/09/2023 Employee Stock Purchase Plan Issuer N 11900 03/09/2026 Cash N Christine Zedelmayer

2223 AVENIDA DE LA PLAYA SUITE 105 LA JOLLA CA 92037

Common Stock 11/25/2025 8098 7696.00 Christine Zedelmayer

2223 AVENIDA DE LA PLAYA SUITE 105 LA JOLLA CA 92037

Common Stock 12/12/2025 23804 31897.00 Christine Zedelmayer

2223 AVENIDA DE LA PLAYA SUITE 105 LA JOLLA CA 92037

Common Stock 12/15/2025 11900 15589.00 Christine Zedelmayer

2223 AVENIDA DE LA PLAYA SUITE 105 LA JOLLA CA 92037

Common Stock 02/19/2026 185937 322476.00 03/09/2026 08/27/2025 /s/ Dominick Iadicicco, as a duly authorized representative of Maxim Group LLC., as attorney-in-fact for Christine Zedelmayer