Rallybio CEO exercises options for 22,456 shares

The option was granted under Rallybio's 2021 Equity Incentive Plan and vests in 48 equal monthly installments until fully vested on February 14, 2029.

Rhea-AI Filing Summary

Rallybio Corp's Chief Executive Officer, Stephen Uden, exercised options to acquire 22,456 shares of common stock on October 6, 2026, at an exercise price of $6.08 per share. His reported direct common-stock holdings following the transaction were 115,620 shares.

Insider Trade Summary

22,456 shares exercised/converted

Exercise 2 txns

Insider Uden Stephen

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Exercise	Option (Right to Buy) F1	22,456	$0.00	$0.00
Exercise	Common Stock	22,456	$6.08	$137K

Holdings After Transaction: Option (Right to Buy) — 0 contracts (Direct); Common Stock — 115,620 shares (Direct)

Footnotes (1)

1. F1. The option is granted under the Company's 2021 Equity Incentive Plan. The option vests in 48 equal monthly installments until fully vested on February 14, 2029.

Key Figures

Options exercised: 22,456 options Common shares acquired: 22,456 shares Exercise price: $6.08 per share +2 more

5 metrics

Options exercised 22,456 options October 6, 2026

Common shares acquired 22,456 shares October 6, 2026

Exercise price $6.08 per share Option exercise on October 6, 2026

Direct common shares after exercise 115,620 shares Reported following the October 6, 2026 transaction

Vesting installments 48 equal monthly installments Until fully vested on February 14, 2029

Key Terms

exercise price, Equity Incentive Plan, monthly installments

3 terms

exercise price financial

"at an exercise price of $6.08 per share"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

Equity Incentive Plan financial

"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.

monthly installments financial

"vests in 48 equal monthly installments"

Monthly installments are regular, fixed payments made each month to gradually pay off a larger amount, such as a loan or purchase. Think of it like paying for a big item in small, manageable parts instead of all at once. For investors, understanding installment payments helps gauge how debts are structured and how they might affect financial stability or cash flow over time.

FAQ

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

How many RLYB shares did CEO Stephen Uden acquire in the option exercise?

Stephen Uden acquired 22,456 shares of Rallybio common stock by exercising options on October 6, 2026, at an exercise price of $6.08 per share. His reported direct common-stock holdings after the transaction were 115,620 shares.

What are the vesting terms for Stephen Uden's RLYB option?

The option was granted under Rallybio's 2021 Equity Incentive Plan and vests in 48 equal monthly installments until fully vested on February 14, 2029.

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

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Available on EDGAR 10/08/2026 - 05:05 PM Accepted by SEC EDGAR 10/08/2026 - 05:04 PM Learn about SEC filing dates

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^*

Uden Stephen

(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
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/06/2026

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	10/06/2026		M		22,456	A	$6.08	115,620	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)	$6.08	10/06/2026		M			22,456	(1)	02/14/2035	Common Stock	22,456	$0.00	0	D

Explanation of Responses:

1. The option is granted under the Company's 2021 Equity Incentive Plan. The option vests in 48 equal monthly installments until fully vested on February 14, 2029.

	By: /s/ Jonathan Lieber	10/08/2026
	** 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)