Rallybio director Hunt exercises options for 14,305 shares

The option was issued under Rallybio's 2021 Equity Incentive Plan in lieu of $51,500 in retainer fees.

Available on EDGAR 11/05/2026 - 05:04 PM EST Accepted by SEC EDGAR 11/05/2026 - 05:03 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Rallybio Corp director Ronald Hunt exercised options for 14,305 shares of common stock on November 4, 2026, at an exercise price of $4.45 per share. He directly held 29,125 shares of common stock after the transaction. The option was issued under the company's 2021 Equity Incentive Plan in lieu of $51,500 in retainer fees; its vesting was accelerated in full, and it became fully vested and exercisable on October 26, 2026.

Insider Trade Summary

14,305 shares exercised/converted

Exercise 2 txns

Insider HUNT RONALD

Role Director

Type	Security	Shares	Price	Value
Exercise	Option (Right to Buy) F2, F1	14,305	$3.60	$51K
Exercise	Common Stock	14,305	$4.45	$64K

Holdings After Transaction: Option (Right to Buy) — 0 contracts (Direct); Common Stock — 29,125 shares (Direct)

Footnotes (2)

1. F1. The option is granted under the Company's 2021 Equity Incentive Plan. On October 26, 2026, the vesting of the option was accelerated in full, and the option became fully vested and exercisable as of that date.
2. F2. This option was issued to the reporting person pursuant to the Company's 2021 Equity Incentive Plan in lieu of retainer fees of $51,500.

Key Figures

Shares acquired through option exercise: 14,305 shares Exercise price: $4.45 per share Common shares held after transaction: 29,125 shares +2 more

5 metrics

Shares acquired through option exercise 14,305 shares November 4, 2026

Exercise price $4.45 per share Option exercise on November 4, 2026

Common shares held after transaction 29,125 shares Direct holdings after the November 4, 2026 transaction

Retainer fees $51,500 The option was issued in lieu of retainer fees

Option vesting acceleration date October 26, 2026 The option became fully vested and exercisable

Key Terms

Option (Right to Buy), vesting, retainer fees

3 terms

Option (Right to Buy) technical

"Option (Right to Buy)"

vesting technical

"the vesting of the option was accelerated in full"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

retainer fees financial

"in lieu of retainer fees of $51,500"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many shares did RLYB director Ronald Hunt acquire through option exercise?

Ronald Hunt exercised options for 14,305 shares of common stock on November 4, 2026, at $4.45 per share. He directly held 29,125 common shares after the transaction.

When did RLYB director Ronald Hunt's option become fully vested?

The option's vesting was accelerated in full on October 26, 2026, when it became fully vested and exercisable. It was granted under Rallybio's 2021 Equity Incentive Plan in lieu of $51,500 in retainer fees.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

HUNT RONALD

(Last) (First) (Middle)

C/O RALLYBIO CORPORATION

PO BOX 325

(Street)

EAST BERLIN CONNECTICUT 06023

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Rallybio Corp [ RLYB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
11/04/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	11/04/2026		M		14,305	A	$4.45	29,125	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Option (Right to Buy)	$4.45	11/04/2026		M			14,305	(1)	02/18/2036	Common Stock	14,305	$3.6(2)	0	D

Explanation of Responses:

1. The option is granted under the Company's 2021 Equity Incentive Plan. On October 26, 2026, the vesting of the option was accelerated in full, and the option became fully vested and exercisable as of that date.

2. This option was issued to the reporting person pursuant to the Company's 2021 Equity Incentive Plan in lieu of retainer fees of $51,500.

	By: /s/ Jonathan Lieber, Attorney-in-Fact	11/05/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)