SCHEDULE 13D/A

RALLYBIO CORP

Common Stock, par value $0.0001 per share · CUSIP: 75120L100

Event date: 2026-03-01

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• TPG GP A, LLCReported CIK 0001903793

  Shares: 378,551.00 · Class: 7.2%

• James G. CoulterReported CIK 0001099776

  Shares: 378,551.00 · Class: 7.2%

• Jon WinkelriedReported CIK 0001366946

  Shares: 378,551.00 · Class: 7.2%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.