Comparable stake leader
Skylark Partners I, LP
SEC ownership of ASTROTECH Corp
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001001907.
Disclosed value leader
Ronald W. Cantwell
Comparable rows
22/29
Latest evidence
14 Apr 2026
- Public ticker
- ASTC on Nasdaq
- Parsed ownership sources
- 13D/G, 3/4/5, and 13F
- Largest SEC-reported holder
- Skylark Partners I, LP
- Latest 13D/G holder
- Skylark Partners I, LP
- Latest parsed ownership date
- 14 Apr 2026
- Issuer CIK
- 0001001907
- Issuer location
- Austin, TX
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of ASTROTECH Corp (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
Skylark Partners I, LP
Disclosed value leader
Ronald W. Cantwell
Comparable rows
22/29
Latest evidence
14 Apr 2026
13D/G
3/4/5
13F
Lead comparable stake: 5.4%
7 rows are not safely comparable across share classes.
13D/G row: Skylark Partners I, LP
Showing 1-8 of 29 holder rows.
Quick read
Skylark Partners I, LP leads the comparable SEC ownership view at 5.4%.
22 of 29 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 Skylark Partners I, LP's linked filing trail.
Comparable ownership
Top 5
Skylark Partners I, LP
5.4%
Tom Wilkinson
1.7%
Thomas Wiley Wilkinson
1.4%
Robert N. McFarland
1.1%
Eric Stober
0.93%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 29 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Skylark Partners I, LP |
13D/G
|
5.4%
|
$268,954
94,370 shares
|
$0 | 29 Sep 2025 |
| Tom Wilkinson |
3/4/5
Director
|
1.7%
|
$103,940
29,868 shares
|
— | 14 Apr 2026 |
| Thomas Wiley Wilkinson |
3/4/5
Director
|
1.4%
|
$154,625
23,862 shares
|
— | 14 May 2025 |
| Robert N. McFarland |
3/4/5
Director
|
1.1%
|
$69,272
19,906 shares
|
— | 14 Apr 2026 |
| Eric Stober |
3/4/5
Director
|
0.93%
|
$56,852
16,337 shares
|
— | 14 Apr 2026 |
| Charles Arch Winn |
3/4/5
Director
|
0.57%
|
$34,434
9,895 shares
|
— | 14 Apr 2026 |
| John William Halinski |
3/4/5
Director
|
0.52%
|
$31,340
9,006 shares
|
— | 14 Apr 2026 |
| J. Safra Sarasin Holding AG |
13F
Company
|
1.6%
|
$140,049
27,300 shares
|
— | 31 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 selling over the last 12 months. Net value: -$1,625,071.
Buys
$0
Insiders: 0
Sells
$1,625,071
Insiders: 1
Net
-$1,625,071
Shares: -229,576
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 229,576
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 229,576 | $0 | $1,625,071 | -$1,625,071 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-16 of 16 reporting-owner rows connected to ASTROTECH Corp. Open a relationship link for the CIK-to-CIK filing trail.
Rows
16
Largest Forms 3/4/5 holder
Ronald W. Cantwell
Net 12M change
-$1,625,071
Latest report
14 Apr 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Ronald W. Cantwell | Director | $1,520,582 | Mixed | 14 Apr 2022 | ||
| Thomas Boone Pickens III | CEO, Director | $1,175,374 | Mixed | 14 May 2025 | ||
| James Frank Becker | Director | $158,308 | Filing P/S | 28 May 2024 | ||
| Thomas Wiley Wilkinson | Director | $154,625 | Mixed | 14 May 2025 | ||
| Daniel T. Russler Jr. | Director | $125,492 | Filing P/S | 15 Mar 2024 | ||
| Tom Wilkinson | Director | $103,940 | Mixed | 14 Apr 2026 | ||
| Robert N. McFarland | Director | $69,272 | Mixed | 14 Apr 2026 | ||
| Jaime Hinojosa | Cfo | $58,222 | Mixed | 28 Aug 2024 | ||
| Eric Stober | Director | $56,852 | Mixed | 14 Apr 2026 | ||
| Charles Arch Winn | Director | $34,434 | Mixed | 14 Apr 2026 | ||
| Jennifer Canas | Chief Financial Officer | $34,020 | Mixed | 22 May 2025 | ||
| John William Halinski | Director | $31,340 | Mixed | 14 Apr 2026 | ||
| Braden M. Leonard | 10%+ Owner | $0 | -$1,625,071 | -100% | Mixed | 03 Oct 2025 |
| Ryan L. Polk | Chief Financial Officer | $0 | Mixed | 14 Jan 2025 | ||
| Scott Bartley | Interim CFO, Treasurer and Sec | $0 | Mixed | 27 Oct 2025 | ||
| Nihanth Badugu | Chief Operating Officer | Mixed | 13 Aug 2025 |
Recent insider transactions for ASTROTECH Corp
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Tom Wilkinson | ASTC | Common Stock | Award | 25.2% | 6,006 | 29,868 | 14 Apr 2026 | Direct | ||
| Charles Arch Winn | ASTC | Common Stock | Award | 154.4% | 6,006 | 9,895 | 14 Apr 2026 | Direct | ||
| Eric Stober | ASTC | Common Stock | Award | 58.1% | 6,006 | 16,337 | 14 Apr 2026 | Direct | ||
| Robert N. McFarland | ASTC | Common Stock | Award | 43.2% | 6,006 | 19,906 | 14 Apr 2026 | Direct | ||
| Braden Michael Leonard | ASTC | Common Stock | Sale | -100% | $53,438 | $5.83 | -9,166 | 0 | 03 Oct 2025 | Direct |
| Braden Michael Leonard | ASTC | Common Stock | Sale | -100% | $1,571,634 | $7.13 | -220,410 | 0 | 03 Oct 2025 | Holdings of BML Investment Partners, L.P |
* marks a reported price that did not pass the local price check.