Comparable stake leader
Ronald W. Cantwell
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
0/33
Latest evidence
30 Sep 2026
- Public ticker
- ASTC on Nasdaq
- Parsed ownership sources
-
3/4/5, 13F, and 13D/G
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Ronald W. Cantwell
Ranking: Comparable ownership first, then disclosed value
- Latest 13D/G holder
-
Skylark Partners I, LP
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
30 Sep 2026
Freshness: Most recent filing date in this holder set
- 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
Ronald W. Cantwell
Disclosed value leader
Ronald W. Cantwell
Comparable rows
0/33
Latest evidence
30 Sep 2026
3/4/5
13F
13D/G
Highest disclosed value: $1,520,582
33 rows are not safely comparable across share classes.
13D/G row: Skylark Partners I, LP
Showing 1-8 of 33 holder rows.
Quick read
Ronald W. Cantwell has the largest disclosed position value at $1.52M.
0 of 33 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.
Disclosed position value
Top 5
Ronald W. Cantwell
$1.52M
Thomas Boone Pickens III
$1.18M
JANE STREET GROUP, LLC
$597.6K
Tom Wilkinson
$351.7K
VANGUARD CAPITAL MANAGEMENT LLC
$243.8K
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-8 of 33 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Ronald W. Cantwell |
3/4/5
Director
|
—
denominator unverified
|
$1,520,582
182,324 shares
|
— | 14 Apr 2022 |
| Thomas Boone Pickens III |
3/4/5
CEO, Director
|
—
mixed-class rows
|
$1,175,374
283,654 shares
mixed-class rows
|
— | 14 May 2025 |
| JANE STREET GROUP, LLC |
13F
Company
|
—
denominator unverified
|
$597,583
54,799 shares
|
— | 30 Jun 2026 |
| Tom Wilkinson |
3/4/5
Director
|
—
denominator unverified
|
$351,729
32,254 shares
|
— | 30 Sep 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
—
denominator unverified
|
$243,792
22,356 shares
|
— | 30 Jun 2026 |
| Robert N. McFarland |
3/4/5
Director
|
—
denominator unverified
|
$243,094
22,292 shares
|
— | 30 Sep 2026 |
| Eric Stober |
3/4/5
Director
|
—
denominator unverified
|
$230,389
21,127 shares
|
— | 30 Sep 2026 |
| BlackRock, Inc. |
13F
Company
|
—
denominator unverified
|
$220,150
20,188 shares
|
— | 30 Jun 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
No eligible buy or sell activity is available for this window. No eligible Buy or Sell transactions are available in this dataset since 21 Oct 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| 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 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-17 of 17 reporting-owner rows connected to ASTROTECH Corp. Open a relationship link for the CIK-to-CIK filing trail.
Rows
17
Largest Forms 3/4/5 holder
Ronald W. Cantwell
Net 12M change
$0
Latest report
30 Sep 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 | ||
| Tom Wilkinson | Director | $351,729 | Mixed | 30 Sep 2026 | ||
| Robert N. McFarland | Director | $243,094 | Mixed | 30 Sep 2026 | ||
| Eric Stober | Director | $230,389 | Mixed | 30 Sep 2026 | ||
| James Frank Becker | Director | $158,308 | Filing P/S | 28 May 2024 | ||
| Charles Arch Winn | Director | $157,370 | Mixed | 30 Sep 2026 | ||
| Thomas Wiley Wilkinson | Director | $154,625 | Mixed | 14 May 2025 | ||
| John William Halinski | Director | $147,675 | Mixed | 30 Sep 2026 | ||
| Daniel T. Russler Jr. | Director | $125,492 | Filing P/S | 15 Mar 2024 | ||
| Jaime Hinojosa | Cfo | $58,222 | Mixed | 28 Aug 2024 | ||
| Nihanth Badugu | Chief Operating Officer | $47,000 | Mixed | 22 Jul 2026 | ||
| Matthew Kreps | Director | $35,593 | Mixed | 30 Sep 2026 | ||
| Jennifer Canas | Chief Financial Officer | $34,020 | Mixed | 22 May 2025 | ||
| Braden M. Leonard | 10%+ Owner | $0 | 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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Matthew Kreps | ASTC | Common Stock | Award | 51.8% | 1,114 | 3,264 | 30 Sep 2026 | Direct | ||
| Charles Arch Winn | ASTC | Common Stock | Award | 10.2% | 1,331 | 14,431 | 30 Sep 2026 | Direct | ||
| John William Halinski | ASTC | Common Stock | Award | 10.9% | 1,331 | 13,542 | 30 Sep 2026 | Direct | ||
| Eric Stober | ASTC | Common Stock | Award | 7.49% | 1,473 | 21,127 | 30 Sep 2026 | Direct | ||
| Robert N. McFarland | ASTC | Common Stock | Award | 6.35% | 1,331 | 22,292 | 30 Sep 2026 | Direct | ||
| Tom Wilkinson | ASTC | Common Stock | Award | 4.3% | 1,331 | 32,254 | 30 Sep 2026 | Direct | ||
| Charles Arch Winn | ASTC | Common Stock | Award | 19.6% | 2,150 | 13,100 | 01 Sep 2026 | Direct | ||
| Charles Arch Winn | ASTC | Common Stock | Award | 19.6% | 2,150 | 13,100 | 01 Sep 2026 | Direct | ||
| Nihanth Badugu | ASTC | Common Stock | Award | 5,000 | 5,000 | 22 Jul 2026 | Direct | |||
| Nihanth Badugu | ASTC | Common Stock | Award | 5,000 | 5,000 | 22 Jul 2026 | Direct | |||
| Eric Stober | ASTC | Common Stock | Award | 12.3% | 2,150 | 19,654 | 16 Jul 2026 | Direct | ||
| John William Halinski | ASTC | Common Stock | Award | 21.4% | 2,150 | 12,211 | 16 Jul 2026 | Direct | ||
| Matthew Kreps | ASTC | Common Stock | Award | 2,150 | 2,150 | 16 Jul 2026 | Direct | |||
| Robert N. McFarland | ASTC | Common Stock | Award | 5.3% | 1,055 | 20,961 | 09 Jul 2026 | Direct | ||
| John William Halinski | ASTC | Common Stock | Award | 9.46% | 1,055 | 12,211 | 09 Jul 2026 | Direct | ||
| Charles Arch Winn | ASTC | Common Stock | Award | 10.7% | 1,055 | 10,950 | 09 Jul 2026 | Direct | ||
| Eric Stober | ASTC | Common Stock | Award | 6.31% | 1,167 | 19,654 | 09 Jul 2026 | Direct | ||
| Tom Wilkinson | ASTC | Common Stock | Award | 3.53% | 1,055 | 30,923 | 09 Jul 2026 | Direct | ||
| John William Halinski | ASTC | Common Stock | Award | 200.2% | 6,006 | 9,006 | 14 Apr 2026 | Direct | ||
| 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 |
* marks a reported price that did not pass the local price check.