X0206 3 2021-07-29 0 0001739410 Rallybio Corp RLYB 0001661481 Boudreau Helen M C/O RALLYBIO CORPORATION 234 CHURCH STREET, SUITE 1020 NEW HAVEN CT 06510 1 0 0 0 Common Stock 23882 D Option (Right to Buy) 13.00 2031-07-28 Common Stock 13440 D The option vests as to the underlying shares of Common Stock on the earlier of July 28, 2022 and the date of the first annual meeting of stockholders of the Issuer following the closing of its initial public offering. Exhibit List: Exhibit 24 - Power of Attorney /s/ Michael Greco, Attorney-in-Fact 2021-07-29