Vaxart (VXRT) CEO Steven Lo reports RSU tax withholding of 22,425 shares

Rhea-AI Filing Summary

Vaxart, Inc. President and CEO Steven Lo reported a tax-related share disposition tied to RSU vesting. On March 18, 2026, 22,425 shares of common stock were withheld by the company at $0.6346 per share to cover income tax obligations on vested RSUs, a non-market transaction coded as "F." After this withholding, Lo directly owned 2,611,634 common shares and indirectly held 100,000 additional shares through the Lo Family Trust, indicating that his overall equity stake remains substantial despite the routine tax withholding.

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

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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)
03/18/2026

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	03/18/2026		F		22,425(1)	D	$0.6346	2,611,634	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 18, 2026.

	/s/ Edward Berg, Attorney-in-Fact	03/19/2026
	** 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)

FAQ

What insider transaction did Vaxart (VXRT) disclose for Steven Lo?

Vaxart disclosed that CEO Steven Lo had 22,425 shares of common stock withheld to satisfy income tax obligations on vested RSUs. This was a non-market, tax-withholding disposition rather than an open-market purchase or sale of shares.

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

No, the Form 4 shows a tax-withholding disposition coded "F," meaning shares were withheld by Vaxart to pay income taxes on vested RSUs, not sold on the open market to third-party buyers.

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

A total of 22,425 Vaxart common shares were withheld at $0.6346 per share. These shares satisfied income tax withholding and remittance obligations related to RSUs that vested on March 18, 2026.

What are Steven Lo’s Vaxart (VXRT) holdings after this Form 4?

Following the tax-withholding transaction, Steven Lo directly owned 2,611,634 Vaxart common shares. He also indirectly held 100,000 additional shares through the Lo Family Trust, as reported in a separate holding entry on the same Form 4.

What does transaction code "F" mean on the Vaxart (VXRT) Form 4?

Transaction code "F" indicates shares were delivered or withheld to satisfy exercise price or tax liabilities. In this case, Vaxart withheld shares to cover Steven Lo’s income tax obligations on RSUs vested as of March 18, 2026.

Did Steven Lo exercise any Vaxart (VXRT) derivatives in this filing?

No derivative exercises were reported in this Form 4. The derivative summary is empty, and the only disposition involved withholding 22,425 common shares for tax obligations tied to vested restricted stock units.