X0206 3 2021-07-29 0 0001739410 Rallybio Corp RLYB 0001551966 Hopfner Robert Lorne C/O RALLYBIO CORPORATION 234 CHURCH STREET, SUITE 1020 NEW HAVEN CT 06510 1 0 0 0 Common Stock 1694388 I Pivotal bioVenture Partners Fund I L.P. Option (Right to Buy) 13.00 2031-07-28 Common Stock 13440 D Shares of common stock are held directly by Pivotal bioVenture Partners Fund I L.P. ("Pivotal"). Pivotal bioVenture Partners Fund I G.P., L.P. is the general partner of Pivotal. Dr. Hopfner is a managing director at Pivotal bioVenture Partners and may be deemed to share voting and dispositive power over the shares held by Pivotal. Dr. Hopfner disclaims beneficial ownership of the shares held by Pivotal except to the extent of his pecuniary interest therein. 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