Rallybio Corp — Director's Dealing 2026

Feb 21, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Rallybio Corp (RLYB)
CIK: 0001739410
Period of Report: 2026-02-18

Reporting Person: MACKAY MARTIN (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-18	Option (Right to Buy)	$4.45	A	18055	Acquired	2036-02-18	Common Stock (18055)	Direct

Footnotes

F1: The option vests as to the underlying shares of Common Stock in 11 equal installments, each on the last day of each remaining month of calendar year 2026.

F2: This option was issued to the reporting person pursuant to the Company's 2021 Equity Incentive Plan in lieu of retainer fees of $65,000.