Comparable stake leader
Sio Capital Management, LLC
SEC ownership of Vaxart, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000072444.
Disclosed value leader
Sio Capital Management, LLC
Comparable rows
6/26
Latest evidence
16 Jul 2026
- Public ticker
- VXRT on OTC
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Sio Capital Management, LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
6 of 26
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Sio Capital Management, LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
16 Jul 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000072444
- Issuer location
- South San Francisco, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Vaxart, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Sio Capital Management, LLC
Disclosed value leader
Sio Capital Management, LLC
Comparable rows
6/26
Latest evidence
16 Jul 2026
13D/G
13F
3/4/5
Lead comparable stake: 2.4%
20 rows are not safely comparable across share classes.
13D/G row: Sio Capital Management, LLC
Showing 1-8 of 26 holder rows.
Quick read
Sio Capital Management, LLC leads the comparable SEC ownership view at 2.4%.
6 of 26 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Sio Capital Management, LLC's linked filing trail.
Comparable ownership
Top 5
Sio Capital Management, LLC
2.4%
Heritage Wealth Advisors
0.01%
LVM CAPITAL MANAGEMENT LTD/MI
0.01%
Ascentis Independent Advisors
0%
First Command Advisory Services, ...
0%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 26 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Sio Capital Management, LLC |
13D/G
|
2.4%
|
$2,400,883
5,583,448 shares
|
-$2,550,703 | 31 Mar 2025 |
| Heritage Wealth Advisors |
13F
Company
|
0.01%
|
$17,941
29,655 shares
|
— | 31 Mar 2026 |
| LVM CAPITAL MANAGEMENT LTD/MI |
13F
Company
|
0.01%
|
$15,000
25,000 shares
|
— | 31 Mar 2026 |
| Ascentis Independent Advisors |
13F
Company
|
0%
|
$1,210
2,000 shares
|
— | 31 Mar 2026 |
| First Command Advisory Services, Inc. |
13F
Company
|
0%
|
$24
40 shares
|
— | 31 Mar 2026 |
| Archer Investment Corp |
13F
Company
|
0%
|
$9
15 shares
|
— | 31 Mar 2026 |
| Cezar Andrei Floroiu |
3/4/5
President, Chief Exec Officer, Director
|
—
mixed-class rows
|
$1,082,037
1,202,735 shares
mixed-class rows
|
— | 17 Mar 2023 |
| Steven Lo |
3/4/5
President, Chief Exec Officer, Director
|
—
mixed-class rows
|
$895,653
4,128,606 shares
mixed-class rows
|
— | 24 Mar 2026 |
How to read this table
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.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$66,636.
Buys
$66,636
Insiders: 3
Sells
$0
Insiders: 0
Net
+$66,636
Shares: +170,000
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 170,000
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 10,000 | 0 | $6,530 | $0 | +$6,530 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 60,000 | 0 | $24,106 | $0 | +$24,106 |
| 9-12 | 100,000 | 0 | $36,000 | $0 | +$36,000 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 20 reporting-owner rows connected to Vaxart, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
20
Largest Forms 3/4/5 holder
Cezar Andrei Floroiu
Net 12M change
+$66,636
Latest report
16 Jul 2026
| 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 | Mixed | 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 | $146,502 | +$36,000 | +33% | Median | 16 Jul 2026 |
| W. Mark Watson | Director | $104,115 | +$14,715 | +16% | Median | 16 Jul 2026 |
| Elaine J. Heron | Director | $81,579 | +$15,921 | +24% | Median | 16 Jul 2026 |
| James B. Breitmeyer | Director | $52,269 | Median | 16 Jul 2026 | ||
| David E. Wheadon | Director | $51,690 | Median | 16 Jul 2026 | ||
| Robert A. Yedid | Director | $44,837 | Mixed | 11 Jun 2024 | ||
| 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 |
Recent insider transactions for Vaxart, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Kevin Finney | VXRT | Common Stock | Award | 19.2% | 39,400 | 244,171 | 16 Jul 2026 | Direct | ||
| Kevin Finney | VXRT | Stock Options (right to buy) | Award | 78,700 | 78,700 | 16 Jul 2026 | Direct | |||
| James B. Breitmeyer | VXRT | Common Stock | Award | 10.6% | 8,315 | 87,115 | 16 Jul 2026 | Direct | ||
| James B. Breitmeyer | VXRT | Stock Options (right to buy) | Award | 16,610 | 16,610 | 16 Jul 2026 | Direct | |||
| Elaine J. Heron | VXRT | Common Stock | Award | 40.8% | 39,400 | 135,966 | 16 Jul 2026 | Direct | ||
| Elaine J. Heron | VXRT | Stock Options (right to buy) | Award | 78,700 | 78,700 | 16 Jul 2026 | Direct | |||
| W. Mark Watson | VXRT | Common Stock | Award | 29.4% | 39,400 | 173,525 | 16 Jul 2026 | Direct | ||
| W. Mark Watson | VXRT | Stock Options (right to buy) | Award | 78,700 | 78,700 | 16 Jul 2026 | Direct | |||
| David E. Wheadon | VXRT | Common Stock | Award | 84.3% | 39,400 | 86,150 | 16 Jul 2026 | Direct | ||
| David E. Wheadon | VXRT | Stock Options (right to buy) | Award | 78,700 | 78,700 | 16 Jul 2026 | Direct | |||
| W. Mark Watson | VXRT | Common Stock | Purchase | 8.06% | $6,530 | $0.6530 | 10,000 | 134,125 | 22 May 2026 | Direct |
| 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 |
* marks a reported price that did not pass the local price check.