X0306 4 2022-03-21 0 0001739410 Rallybio Corp RLYB 0001872879 Fryer Jeffrey M C/O RALLYBIO CORPORATION 234 CHURCH STREET, SUITE 1020 NEW HAVEN CT 06510 0 1 0 0 See Remarks Common Stock 2022-03-21 4 P 0 3000 8.04 A 47048 I See Footnote Common Stock 272609 I See Footnote Common Stock 201934 I See Footnote Common Stock 201934 I See Footnote The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $8.00 to $8.99, inclusive. The reporting person undertakes to provide to Rallybio Corporation, any security holder of Rallybio Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote (1) to this Form 4. Shares of common stock are held in a Roth IRA. Shares of common stock are held in a revocable trust for which Mr. Fryer is the grantor. Shares of common stock are held in an irrevocable trust for the benefit of one of Mr. Fryer's children. Mr. Fryer disclaims beneficial ownership of such shares. Shares of common stock are held in an irrevocable trust for the benefit of one of Mr. Fryer's children. Mr. Fryer disclaims beneficial ownership of such shares. Chief Financial Officer & Treasurer By: /s/ Michael Greco, Attorney-in-Fact 2022-03-23