X0202 SCHEDULE 13G 0001940272 XXXXXXXX LIVE Common Stock, par value $0.0001 per share 05/31/2026 0001739410 Rallybio Corporation 75120L209 234 Church Street New Haven CT 06510 Rule 13d-1(b) ADAR1 Capital Management, LLC b TX 0.00 926352.00 0.00 926352.00 926352.00 N 17.5 IA OO The amounts reported in boxes 6, 8, and 9 represent 926,352 shares of common stock, par value $0.0001 per share ("Common Stock"), of Rallybio Corporation (the "Company") owned directly by private investment funds managed by ADAR1 Capital Management, LLC and separately managed accounts of ADAR1 Capital Management, LLC. Such securities may be deemed to be indirectly beneficially owned by ADAR1 Capital Management, LLC. The percentage in box 11 is based on 5,298,137 shares of Common Stock outstanding as of May 8, 2026, as reported in the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2026, filed with the Securities and Exchange Commission on May 13, 2026. Daniel Schneeberger b V8 0.00 926352.00 0.00 926352.00 926352.00 N 17.5 HC IN The amounts reported in boxes 6, 8, and 9 represent 926,352 shares of common stock, par value $0.0001 per share ("Common Stock"), of Rallybio Corporation (the "Company") owned directly by private investment funds managed by ADAR1 Capital Management, LLC and separately managed accounts of ADAR1 Capital Management, LLC. Such securities may be deemed to be indirectly beneficially owned by Daniel Schneeberger, the sole manager of ADAR1 Capital Management, LLC. The percentage in box 11 is based on 5,298,137 shares of Common Stock outstanding as of May 8, 2026, as reported in the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2026, filed with the Securities and Exchange Commission on May 13, 2026. Rallybio Corporation 234 Church Street, New Haven, CT 06510 This Schedule is being filed on behalf of each of the following persons (each, a "Reporting Person" and collectively, the "Reporting Persons"): (i) ADAR1 Capital Management, LLC ("ADAR1 Capital Management"); and (ii) Daniel Schneeberger ("Mr. Schneeberger"). The address of the principal business office of each of the Reporting Persons is 3503 Wild Cherry Drive, Building 9, Austin, Texas 78738. (i) ADAR1 Capital Management is a Texas limited liability company; and (ii) Mr. Schneeberger is a citizen of Switzerland. N IA HC The information contained on the cover pages of this Schedule 13G is incorporated herein by reference. The information contained on the cover pages of this Schedule 13G is incorporated herein by reference. The information contained on the cover pages of this Schedule 13G is incorporated herein by reference. The information contained on the cover pages of this Schedule 13G is incorporated herein by reference. The information contained on the cover pages of this Schedule 13G is incorporated herein by reference. The information contained on the cover pages of this Schedule 13G is incorporated herein by reference. Y Y N Mr. Schneeberger is filing this Schedule 13G as a control person in respect of shares beneficially owned by ADAR1 Capital Management, an investment adviser as described in SS 240.13d-1(b)(1)(ii)(E). Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. Exhibit A: Joint Filing Agreement ADAR1 Capital Management, LLC /s/ Daniel Schneeberger 06/05/2026 Daniel Schneeberger /s/ Daniel Schneeberger 06/05/2026