Rallybio CFO exercises options for 7,124 shares

The option's vesting was accelerated in full on October 26, 2026, making it fully vested and exercisable before the reported exercise.

Available on EDGAR 11/03/2026 - 05:51 PM EST Accepted by SEC EDGAR 11/03/2026 - 05:51 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Rallybio Corp (RLYB) Chief Financial Officer Jonathan I. Lieber exercised options for 7,124 common shares on November 2, 2026, at an exercise price of $14.88 per share. After the exercise, he directly held 44,139 common shares, and the reported option position was zero. The options were granted under Rallybio's 2021 Equity Incentive Plan.

Insider Trade Summary

7,124 shares exercised/converted

Exercise 2 txns

Insider Lieber Jonathan I

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Exercise	Option (Right to Buy) F1	7,124	$0.00	$0.00
Exercise	Common Stock	7,124	$14.88	$106K

Holdings After Transaction: Option (Right to Buy) — 0 contracts (Direct); Common Stock — 44,139 shares (Direct)

Footnotes (1)

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.

Key Figures

Common shares acquired: 7,124 shares Exercise price: $14.88 per share Direct common shares held after exercise: 44,139 shares +1 more

4 metrics

Common shares acquired 7,124 shares Option exercise on November 2, 2026

Exercise price $14.88 per share Option exercise on November 2, 2026

Direct common shares held after exercise 44,139 shares After the November 2, 2026 exercise

Reported option position after exercise 0 options After the November 2, 2026 exercise

Key Terms

vesting, fully vested and exercisable, Equity Incentive Plan

3 terms

vesting financial

"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.

fully vested and exercisable financial

"fully vested and exercisable as of that date"

Equity Incentive Plan financial

"Company's 2021 Equity Incentive Plan"

An equity incentive plan is a program that gives employees, executives or directors the right to receive company stock or options to buy stock as part of their pay. Think of it as offering slices of future company profit to motivate people to boost long‑term performance; for investors it matters because it can align employee goals with shareholder value but also increases the number of shares outstanding, which can dilute existing ownership.

FAQ

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

How many RLYB shares did Jonathan I. Lieber acquire through the option exercise?

Lieber acquired 7,124 common shares through an option exercise on November 2, 2026, at an exercise price of $14.88 per share.

How many RLYB shares did Jonathan I. Lieber hold after exercising the options?

After the exercise, Lieber directly held 44,139 common shares.

When did Jonathan I. Lieber's options become fully vested and exercisable?

The option's vesting was accelerated in full on October 26, 2026, and it became fully vested and exercisable on that date.

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^*

Lieber Jonathan I

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
11/02/2026

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	11/02/2026		M		7,124	A	$14.88	44,139	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)	$14.88	11/02/2026		M			7,124	(1)	02/15/2034	Common Stock	7,124	$0	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.

	By: /s/ Jonathan Lieber	11/03/2026
	** 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)