Insider Transactions Reported by 20 Insiders of Vaxart, Inc.

Symbol: VXRT on OTC
Location: South San Francisco, CA

Key facts

VXRT - Vaxart, Inc. has 20 insiders with reported activity on this page.
Net insider value flow over the last year: +$90,090.
Recent transaction rows are available for direct filing-level review.

Change

Buy value: $90,090; sell value: $0.
Net share flow: +236,668.

Research use

This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.

Evidence

Filed on Form 4

Issuer insider activity is sourced from SEC Forms 3, 4, and 5.

See Original Filing

Insider trading overview

Last 12 months

Net insider flow leans to buying over the last 12 months. Net value: +$90,090.

Buys

$90,090

Shares: 236,668

Insiders: 3

Sells

Shares: 0

Insiders: 0

Net

+$90,090

Shares: +236,668

Insiders: 3

Window (months)	Buy shares	Buy $	Sell $	Net $
0-3	0	$0	$0	$0
3-6	0	$0	$0	$0
6-9	60,000	$24,106	$0	+$24,106
9-12	176,668	$65,984	$0	+$65,984

Vaxart, Inc. executives and other stock owners filed with the SEC include:

Name	Relationship	Holdings Value	Past Year Net Change	Change %	Valuation	Report Date
Cezar Andrei Floroiu	President, Chief Exec Officer, Director	$1,082,037			Mixed	17 Mar 2023
Steven Lo	President, Chief Exec Officer, Director	$895,653			Mixed	24 Mar 2026
Phillip E. Lee	Chief Financial Officer	$360,149			Mixed	24 Mar 2025
Michael J. Finney	Director	$330,334			Mixed	13 Jun 2025
Jeroen Nicolaas Grasman	Chief Financial Officer	$327,363			Median	19 May 2026
Sean Tucker	SVP, Chief Scientific Officer	$326,770			Mixed	28 Mar 2026
James F. Cummings	Chief Medical Officer	$320,134			Mixed	28 Mar 2026
Todd C. Davis	Director	$300,913			Mixed	04 Aug 2022
Edward B. Berg	SVP, General Counsel	$261,659			Mixed	24 Mar 2026
Kevin Finney	Director	$75,765	+$61,934	+448%	Filing P/S	17 Jul 2025
W. Mark Watson	Director	$50,518	+$12,235	+32%	Filing P/S	17 Nov 2025
James B. Breitmeyer	Director	$47,477			Median	23 Apr 2026
Robert A. Yedid	Director	$44,837			Mixed	11 Jun 2024
Elaine J. Heron	Director	$39,109	+$15,921	+69%	Filing P/S	17 Nov 2025
David E. Wheadon	Director	$21,972			Mixed	13 Jun 2025
Julie M. Cherrington	Director	$14,859			Mixed	04 Aug 2022
Fuad Ahmad	Interim CFO	$11,950			Mixed	22 Jun 2022
Wouter Latour	Director				Mixed	06 May 2021
Margaret Echerd	SVP, Principal Accntng Officer				Mixed	30 Nov 2021
Karen J. Wilson	Director				Mixed	16 Jun 2021

Top shareholders of Vaxart, Inc. (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
Sio Capital Management, LLC	13D/G	—	2.4%	5,583,448	$2,400,883	-$2,550,703	31 Mar 2025	13D/G
Heritage Wealth Advisors	13F	Company	0.01%	29,655	$17,941	—	31 Mar 2026	13F
LVM CAPITAL MANAGEMENT LTD/MI	13F	Company	0.01%	25,000	$15,000	—	31 Mar 2026	13F
Ascentis Independent Advisors	13F	Company	0%	2,000	$1,210	—	31 Mar 2026	13F
First Command Advisory Services, Inc.	13F	Company	0%	40	$24	—	31 Mar 2026	13F
Archer Investment Corp	13F	Company	0%	15	$9	—	31 Mar 2026	13F
Cezar Andrei Floroiu	3/4/5	President, Chief Exec Officer, Director	— mixed-class rows	1,202,735 mixed-class rows	$1,082,037	—	17 Mar 2023	3/4/5
Steven Lo	3/4/5	President, Chief Exec Officer, Director	— mixed-class rows	4,128,606 mixed-class rows	$895,653	—	24 Mar 2026	3/4/5
Phillip E. Lee	3/4/5	Chief Financial Officer	— mixed-class rows	1,241,619 mixed-class rows	$360,149	—	24 Mar 2025	3/4/5
Michael J. Finney	3/4/5	Director	— mixed-class rows	798,240 mixed-class rows	$330,334	—	13 Jun 2025	3/4/5
Jeroen Nicolaas Grasman	3/4/5	Chief Financial Officer	— mixed-class rows	1,000,605 mixed-class rows	$327,363	—	19 May 2026	3/4/5
Sean Tucker	3/4/5	SVP, Chief Scientific Officer	— mixed-class rows	1,353,336 mixed-class rows	$326,770	—	28 Mar 2026	3/4/5
James F. Cummings	3/4/5	Chief Medical Officer	— mixed-class rows	1,379,177 mixed-class rows	$320,134	—	28 Mar 2026	3/4/5
Todd C. Davis	3/4/5	Director	— mixed-class rows	170,129 mixed-class rows	$300,913	—	04 Aug 2022	3/4/5
Edward B. Berg	3/4/5	SVP, General Counsel	— mixed-class rows	980,368 mixed-class rows	$261,659	—	24 Mar 2026	3/4/5
Kevin Finney	3/4/5	Director	— mixed-class rows	241,163 mixed-class rows	$75,765	+$61,934	17 Jul 2025	3/4/5
W. Mark Watson	3/4/5	Director	— mixed-class rows	219,525 mixed-class rows	$50,518	+$12,235	17 Nov 2025	3/4/5
James B. Breitmeyer	3/4/5	Director	— mixed-class rows	236,200 mixed-class rows	$47,477	—	23 Apr 2026	3/4/5
Robert A. Yedid	3/4/5	Director	— mixed-class rows	129,890 mixed-class rows	$44,837	—	11 Jun 2024	3/4/5
Elaine J. Heron	3/4/5	Director	— mixed-class rows	191,966 mixed-class rows	$39,109	+$15,921	17 Nov 2025	3/4/5
David E. Wheadon	3/4/5	Director	— mixed-class rows	142,150 mixed-class rows	$21,972	—	13 Jun 2025	3/4/5
Julie M. Cherrington	3/4/5	Director	— mixed-class rows	43,497 mixed-class rows	$14,859	—	04 Aug 2022	3/4/5
Fuad Ahmad	3/4/5	Interim CFO	— class O/S missing	5,000	$11,950	—	22 Jun 2022	3/4/5
Wouter Latour	3/4/5	Director	— class O/S missing	700,000	—	—	06 May 2021	3/4/5
Margaret Echerd	3/4/5	SVP, Principal Accntng Officer	— class O/S missing	26,416	—	—	30 Nov 2021	3/4/5
Karen J. Wilson	3/4/5	Director	— class O/S missing	15,097	—	—	16 Jun 2021	3/4/5

Recent Insider Transactions by Companies or Individuals for Vaxart, Inc.

Showing up to 300 most recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	Value $	* Price $	Shares	Shares Owned	Date	Ownership
Jeroen Nicolaas Grasman	VXRT	Common Stock	Tax liability	-5.44%			-31,395	545,605	19 May 2026	Direct
James B. Breitmeyer	VXRT	Common Stock	Award				78,800	78,800	23 Apr 2026	Direct
James B. Breitmeyer	VXRT	Stock Option (right to buy)	Award				157,400	157,400	23 Apr 2026	Direct
Sean Tucker	VXRT	Common Stock	Tax liability	-0.44%			-3,924	882,811	28 Mar 2026	Direct
James F. Cummings	VXRT	Common Stock	Tax liability	-0.35%			-3,292	924,177	28 Mar 2026	Direct
Edward B. Berg	VXRT	Common Stock	Tax liability	-4.6%			-36,418	755,368	24 Mar 2026	Direct
James F. Cummings	VXRT	Common Stock	Tax liability	-3.19%			-30,551	927,469	24 Mar 2026	Direct
Steven Lo	VXRT	Common Stock	Tax liability	-4.83%			-126,028	2,485,606	24 Mar 2026	Direct
Sean Tucker	VXRT	Common Stock	Tax liability	-3.94%			-36,418	886,735	24 Mar 2026	Direct
Edward B. Berg	VXRT	Common Stock	Tax liability	-1.01%			-8,072	791,786	18 Mar 2026	Direct
James F. Cummings	VXRT	Common Stock	Tax liability	-0.7%			-6,772	958,020	18 Mar 2026	Direct
Steven Lo	VXRT	Common Stock	Tax liability	-0.85%			-22,425	2,611,634	18 Mar 2026	Direct
Sean Tucker	VXRT	Common Stock	Tax liability	-0.87%			-8,072	923,153	18 Mar 2026	Direct
Steven Lo	VXRT	Common Stock	Award	47.4%			846,500	2,634,059	16 Mar 2026	Direct
Steven Lo	VXRT	Stock Option (right to buy)	Award				1,543,000	1,543,000	16 Mar 2026	Direct
Sean Tucker	VXRT	Common Stock	Award	27.4%			200,000	931,225	16 Mar 2026	Direct
Sean Tucker	VXRT	Stock Option (right to buy)	Award				410,000	410,000	16 Mar 2026	Direct
Jeroen Nicolaas Grasman	VXRT	Common Stock	Award	64.9%			227,000	577,000	16 Mar 2026	Direct
Jeroen Nicolaas Grasman	VXRT	Stock Option (right to buy)	Award				455,000	455,000	16 Mar 2026	Direct
James F. Cummings	VXRT	Common Stock	Award	30.8%			227,000	964,792	16 Mar 2026	Direct
James F. Cummings	VXRT	Stock Option (right to buy)	Award				455,000	455,000	16 Mar 2026	Direct
Edward B. Berg	VXRT	Common Stock	Award	16.8%			115,000	799,858	16 Mar 2026	Direct
Edward B. Berg	VXRT	Stock Option (right to buy)	Award				225,000	225,000	16 Mar 2026	Direct
Edward B. Berg	VXRT	Common Stock	Tax liability	-1.33%			-9,265	684,858	02 Feb 2026	Direct
James F. Cummings	VXRT	Common Stock	Tax liability	-1.07%			-7,965	737,792	02 Feb 2026	Direct
Sean Tucker	VXRT	Common Stock	Tax liability	-1.25%			-9,265	731,225	02 Feb 2026	Direct
Steven Lo	VXRT	Common Stock	Tax liability	-2.94%			-54,153	1,787,559	04 Dec 2025	Direct
Steven Lo	VXRT	Common Stock	Award	8.95%			151,351	1,841,712	04 Dec 2025	Direct
W. Mark Watson	VXRT	Common Stock	Purchase	19.2%	$8,185	$0.4093	20,000	124,125	17 Nov 2025	Direct
Elaine J. Heron	VXRT	Common Stock	Purchase	70.7%	$15,921	$0.3980	40,000	96,566	17 Nov 2025	Direct
Kevin Finney	VXRT	Common Stock	Purchase	95.4%	$36,000	$0.3600	100,000	204,771	15 Aug 2025	Direct
Kevin Finney	VXRT	Common Stock	Purchase	32.8%	$9,832	$0.3800	25,874	104,771	30 Jul 2025	Direct
W. Mark Watson	VXRT	Common Stock	Purchase	10.6%	$4,050	$0.4050	10,000	104,125	29 Jul 2025	Direct
Kevin Finney	VXRT	Common Stock	Purchase	34%	$8,000	$0.4000	20,000	78,897	28 Jul 2025	Direct
Kevin Finney	VXRT	Common Stock	Purchase	51.4%	$7,800	$0.3900	20,000	58,897	25 Jul 2025	Direct
Kevin Finney	VXRT	Common Stock	Purchase	2.08%	$302	$0.3800	794	38,897	17 Jul 2025	Direct
Kevin Finney	VXRT	Common Stock	Award	19.1%			6,103	38,103	13 Jun 2025	Direct
Kevin Finney	VXRT	Stock Option (right to buy)	Award				36,392	36,392	13 Jun 2025	Direct
W. Mark Watson	VXRT	Common Stock	Award	20.5%			16,000	94,125	13 Jun 2025	Direct
W. Mark Watson	VXRT	Stock Option (right to buy)	Award				95,400	95,400	13 Jun 2025	Direct
Elaine J. Heron	VXRT	Common Stock	Award	39.4%			16,000	56,566	13 Jun 2025	Direct
Elaine J. Heron	VXRT	Stock Option (right to buy)	Award				95,400	95,400	13 Jun 2025	Direct
David E. Wheadon	VXRT	Common Stock	Award	52%			16,000	46,750	13 Jun 2025	Direct
David E. Wheadon	VXRT	Stock Option (right to buy)	Award				95,400	95,400	13 Jun 2025	Direct
Michael J. Finney	VXRT	Common Stock	Award	2.33%			16,000	702,840	13 Jun 2025	Direct
Michael J. Finney	VXRT	Stock Option (right to buy)	Award				95,400	95,400	13 Jun 2025	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.