Rallybio CFO reports grant and tax-related share sale

Rallybio Corp Chief Financial Officer Jonathan I. Lieber reported mixed stock transactions.

Accepted by SEC EDGAR 02/23/2026 - 06:21 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Rallybio Corp Chief Financial Officer Jonathan I. Lieber reported mixed stock transactions. On February 18, 2026, he acquired 2,500 shares of Rallybio common stock as a grant or award at $0.00 per share. On February 23, 2026, he sold 789 shares of common stock at an average price of $5.06 per share, and a footnote explains this sale was made solely to cover tax withholding obligations from the vesting of a performance stock award. Following these transactions, he directly holds 4,115 shares of Rallybio common stock.

Insider Trade Summary

Net Seller: 789 shares

Net Sell 2 txns

Insider Lieber Jonathan I

Role Chief Financial Officer

Sold 789 shs ($4K)

Type	Security	Shares	Price	Value
Sale	Common Stock	789	$5.06	$4K
Grant/Award	Common Stock	2,500	$0.00	$0.00

Holdings After Transaction: Common Stock — 4,115 shares (Direct)

Footnotes (1)

1. F1. The reporting person sold shares of common stock upon the partial vesting of a performance stock award, solely to satisfy tax withholding obligations incurred upon vesting.

FAQ

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

What insider transactions did Rallybio (RLYB) report for CFO Jonathan I. Lieber?

Rallybio’s CFO Jonathan I. Lieber reported two transactions: a grant of 2,500 common shares on February 18, 2026, and a sale of 789 shares on February 23, 2026, related to tax withholding on a performance stock award.

How many Rallybio (RLYB) shares did the CFO sell and at what price?

Jonathan I. Lieber sold 789 shares of Rallybio common stock at an average price of $5.06 per share. According to the footnote, this sale was executed solely to satisfy tax withholding obligations from a vesting performance stock award.

Was the Rallybio (RLYB) CFO’s stock sale a discretionary sale or for tax withholding?

The 789-share sale by Rallybio’s CFO was for tax withholding. The filing states he sold common shares upon partial vesting of a performance stock award solely to cover tax withholding obligations incurred at vesting.

What stock award did the Rallybio (RLYB) CFO receive in this Form 4?

Jonathan I. Lieber received a grant or award of 2,500 Rallybio common shares on February 18, 2026, recorded at $0.00 per share, indicating a compensatory award rather than an open-market purchase.

How many Rallybio (RLYB) shares does the CFO own after these transactions?

After the grant and subsequent tax-related sale, Rallybio’s CFO directly owns 4,115 shares of common stock. This figure reflects his holdings following the February 23, 2026 transaction reported in the Form 4.

What is the net share change for the Rallybio (RLYB) CFO in this Form 4?

Across the reported transactions, the CFO had a net increase of 1,711 shares, combining the 2,500-share award and the 789-share sale executed to satisfy tax withholding obligations on a performance stock award.

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

Form 4 Insider Transactions: What Each Field Means →

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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

234 CHURCH STREET

(Street)

NEW HAVEN CT 06510

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
02/18/2026

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

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

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

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	02/18/2026		A		2,500	A	$0	4,904	D
Common Stock	02/23/2026		S		789(1)	D	$5.06	4,115	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

Explanation of Responses:

1. The reporting person sold shares of common stock upon the partial vesting of a performance stock award, solely to satisfy tax withholding obligations incurred upon vesting.

Remarks:

	By:/s/ Stephen Uden, Attorney-in-Fact	02/23/2026
	** 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).
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