MARTIN MACKAY - 18 Feb 2026 Form 4 Insider Report for Rallybio Corp (RLYB)

Role
Director
Signature
By:/s/ Stephen Uden, Attorney-in-Fact
Issuer symbol
RLYB
Transactions as of
18 Feb 2026
Net transactions value
+$64,998
Form type
4
Filing time
20 Feb 2026, 18:08:28 UTC
Previous filing
02 Jul 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
MACKAY MARTIN Director C/O RALLYBIO CORPORATION, 234 CHURCH STREET, NEW HAVEN By:/s/ Stephen Uden, Attorney-in-Fact 20 Feb 2026 0001414815

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction RLYB Option (Right to Buy) Award $64,998 +18,055 $3.60 18,055 18 Feb 2026 Common Stock 18,055 $4.45 Direct F1, F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
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.