Vaxart CEO shares withheld for RSU tax

Vaxart, Inc. President and CEO Steven Lo reported a tax-related share disposition tied to restricted stock units (RSUs).

Rhea-AI Filing Summary

Vaxart, Inc. President and CEO Steven Lo reported a tax-related share disposition tied to restricted stock units (RSUs). On March 24, 2026, 126,028 shares of common stock were withheld by the company to satisfy income tax withholding and remittance obligations upon RSU vesting, rather than sold in the open market.

Following this withholding, Lo directly holds 2,485,606 shares of Vaxart common stock and indirectly holds 100,000 shares through the Lo Family Trust. The filing reflects routine equity compensation and associated tax treatment rather than a discretionary buy or sell decision.

Insider Trade Summary

Exercise Price or Tax Liability: 126,028 shares

Exercise Price or Tax Liability 2 txns

Insider Lo Steven

Role President, Chief Exec Officer

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	126,028	$0.694	$87K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 2,485,606 shares (Direct); Common Stock — 100,000 shares (Indirect, By the Lo Family Trust)

Footnotes (1)

1. F1. Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of March 24, 2026.

FAQ

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

What did Vaxart (VXRT) CEO Steven Lo report in this Form 4?

Steven Lo reported that 126,028 Vaxart common shares were withheld by the company to cover income tax obligations on vested RSUs. This is a non-market, tax-withholding disposition, not an open-market sale or purchase of shares by the CEO.

How many Vaxart (VXRT) shares were withheld for taxes from Steven Lo?

A total of 126,028 Vaxart common shares were withheld to satisfy the issuer’s income tax withholding and remittance obligations. The withholding occurred in connection with the net settlement of RSUs that vested as of March 24, 2026, according to the filing footnote.

How many Vaxart (VXRT) shares does Steven Lo hold after this Form 4 event?

After the tax withholding, Steven Lo directly holds 2,485,606 Vaxart common shares. In addition, he has an indirect holding of 100,000 shares through the Lo Family Trust, as reported in the Form 4 ownership table.

Was the Vaxart (VXRT) Form 4 transaction an open-market sale by Steven Lo?

The filing indicates it was not an open-market sale. The 126,028 shares were withheld by Vaxart to satisfy tax obligations on vested RSUs, coded as a tax-withholding disposition, which is part of routine equity compensation administration.

What role does the Lo Family Trust play in Steven Lo’s Vaxart (VXRT) holdings?

The Form 4 shows an indirect ownership entry of 100,000 Vaxart common shares held "By the Lo Family Trust." This reflects shares attributed to Steven Lo through the trust, separate from his 2,485,606 directly held shares reported in the filing.

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

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Accepted by SEC EDGAR 03/26/2026 - 04:52 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^*

Lo Steven

(Last) (First) (Middle)

C/O VAXART, INC.

170 HARBOR WAY, SUITE 300

(Street)

SOUTH SAN FRANCISCO CALIFORNIA 94080

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Vaxart, Inc. [ VXRT ]

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

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President, Chief Exec Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/24/2026

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	03/24/2026		F		126,028(1)	D	$0.694	2,485,606	D
Common Stock								100,000	I	By the Lo Family Trust

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. Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of March 24, 2026.

	/s/ Edward Berg, Attorney-in-Fact	03/26/2026
	** 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)