Astrotech Corporation
Astrotech Corporation (ASTC) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ASTC · as of Sep 30, 2025
Ownership Breakdown
16
Institutional Holders
▲ 2 vs Q2
$1.53M
Total Inst. Value
▼ $442,392 vs Q2
1.76M
Shares Outstanding
freeFloat 78.27%
313,664
13F Shares Held
▼ 28,555 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ASTC largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BML CAPITAL MANAGEMENT, LLC laboratory analytical instruments | 220.4K | 13.24% | 13.24% | $1.08B | Nov 10, 2025 | — held |
BLACKROCK, INC. laboratory analytical instruments | 20.2K | 1.21% | 1.21% | $98.92M | Nov 12, 2025 | — held |
GEODE CAPITAL MANAGEMENT, LLC laboratory analytical instruments | 18.8K | 1.13% | 1.13% | $90.91M | Nov 12, 2025 | — held |
VANGUARD GROUP INC laboratory analytical instruments | 14.8K | 88.73% | 88.73% | $71.51M | Nov 7, 2025 | ▼ 38.9K |
SUSQUEHANNA INTERNATIONAL GROUP, LLP laboratory analytical instruments | 13.5K | 81.32% | 81.32% | $65.53M | Nov 14, 2025 | ▲ 13.5K |
SCS CAPITAL MANAGEMENT LLC laboratory analytical instruments | 11.8K | 70.64% | 70.64% | $57.63M | Nov 13, 2025 | — held |
DRW SECURITIES, LLC laboratory analytical instruments | 11.7K | 70.37% | 70.37% | $57.41M | Nov 14, 2025 | NEW |
UBS GROUP AG laboratory analytical instruments | 1.9K | 11.40% | 11.40% | $9.30M | Nov 13, 2025 | ▼ 1.1K |
TOWER RESEARCH CAPITAL LLC (TRC) laboratory analytical instruments | 404 | 2.43% | 2.43% | $1.98M | Nov 14, 2025 | ▲ 153 |
BANK OF AMERICA CORP /DE/ laboratory analytical instruments | 114 | 0.68% | 0.68% | $559,000 | Feb 3, 2026 | ▼ 1 |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
3
Increased
+13.7K shares3
New Positions
first time holders3
Decreased
−40.0K shares2
Sold Out
fully exitedNet shares change (top 50)
26.3K
+13.7K / −40.0K
Net new holders
+1
3 new / 2 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ASTC insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
6
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Wilkinson Tom director | Apr 14, 2026 | Award | 6,006 | — | — | 29.9K | Form 4 ↗ |
Winn Charles Arch director | Apr 14, 2026 | Award | 6,006 | — | — | 9.9K | Form 4 ↗ |
Halinski John William director | May 14, 2025 | Award | 6,006 | — | — | 9.0K | Form 4 ↗ |
Stober Eric director | Apr 14, 2026 | Award | 6,006 | — | — | 16.3K | Form 4 ↗ |
MCFARLAND ROBERT N director | Apr 14, 2026 | Award | 6,006 | — | — | 19.9K | Form 4 ↗ |
Leonard Braden Michael 10 percent owner | Oct 3, 2025 | Sale | 220,410 | $7.13 | $1.57M | 0 | Form 4 ↗ |
Leonard Braden Michael 10 percent owner | Oct 3, 2025 | Sale | 9,166 | $5.83 | $53.4K | 0 | Form 4 ↗ |
Canas Jennifer Chief Financial Officer | May 22, 2025 | Award | 5,250 | $5.95 | $31.2K | 5.3K | Form 4 ↗ |
Canas Jennifer Chief Financial Officer | May 22, 2025 | Award | 5,250 | — | — | 5.3K | Form 4 ↗ |
MCFARLAND ROBERT N director | May 14, 2025 | Award | 3,000 | — | — | 13.9K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Astrotech Corporation (ASTC) is primarily owned by institutional investors, who hold approximately 17.8% of total shares outstanding. Company insiders own approximately 21.73%, while retail and public investors account for the remaining 60.44%.
The largest institutional shareholder of Astrotech Corporation is BML CAPITAL MANAGEMENT, LLC, holding approximately 220,410 shares — equal to 13.24% of outstanding shares — as of September 30, 2025.
A total of 16 institutional investors currently hold ASTC stock, with a combined institutional value of approximately $1,534,145 as of the most recent 13F filing period.
Frequently asked questions
ASTC ownershipAstrotech Corporation (ASTC) is primarily owned by institutional investors, who hold approximately 17.8% of shares. The largest shareholder is BML CAPITAL MANAGEMENT, LLC with a 13.24% stake. Company insiders hold 21.73%. Data sourced from SEC Form 13F as of September 30, 2025.