Form 4 Filing for Rallybio Corp

Stephen Uden, Chief Executive Officer and Director of Rallybio Corp, acquired 22,456 shares of Common Stock on October 6, 2026, at a price of $6.08 per share. This transaction was made under a non-derivative agreement. Concurrently, an option to buy 22,456 shares of Common Stock, with an exercise price of $6.08, was granted to Mr. Uden. This option vests in 48 equal monthly installments until fully vested on February 14, 2029. Following these transactions, Mr. Uden directly owns 115,620 shares of Common Stock and has no remaining options from this grant. The option was granted under the Company's 2021 Equity Incentive Plan.