X0306 4 2022-02-08 0 0001739410 Rallybio Corp RLYB 0001664281 PARMAR KUSH C/O RALLYBIO CORPORATION 234 CHURCH STREET, SUITE 1020 NEW HAVEN CT 06510 1 0 0 0 Common Stock 2022-02-08 4 S 0 139539 13.05 D 2645087 I 5AM Ventures V, L.P. Common Stock 2022-02-08 4 S 0 70461 13.05 D 1335637 I 5AM Opportunities I, L.P. These securities are held directly by 5AM Ventures V, L.P. ("Ventures V"). 5AM Partners V, LLC ("Partners V") is the sole general partner of Ventures V. Dr. Parmar is a managing member of Partners V and may be deemed to share voting and investment power over the securities held by Ventures V. Dr. Parmar disclaims beneficial ownership of the securities held by Ventures V except to the extent of his pecuniary interest therein. These securities are held directly by 5AM Opportunities I, L.P. ("Opportunities I, L.P."). 5AM Opportunities I (GP), LLC ("Opportunities I (GP)") is the general partner of Opportunities I, L.P. Dr. Parmar is a managing member of Opportunities I (GP), and may be deemed to share voting and dispositive power over the securities held by Opportunities I, L.P. Dr. Parmar disclaims beneficial ownership of the securities held by Opportunities I, L.P. except to the extent of his pecuniary interest therein. /s/ Kush Parmar 2022-02-10