Astrotech Corporation (ASTC) Ownership
ASTC ownership summary
as of October 18, 2026- Institutions
- 10.5% of shares outstanding
- Insiders
- 14.75% of shares outstanding
- Shares outstanding
- 2.1M
- Float
- 1.7M shares available to trade
- Short interest
- 4.35% 88K shares short
- Days to cover
- 2.57 short interest down 13.3% vs prior month
- Institutions 10.53%
- Insiders 14.75%
- Other investors 74.72%
ASTC top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Jane Street Group LLC | 2.61% | 55K | $270,159 | +54,799 (0.0%) | June 30, 2026 |
| 2 | J. Safra Sarasin Holding AG | 1.30% | 27K | $134,589 | — | June 30, 2026 |
| 3 | Vanguard Capital Management, LLC | 1.06% | 22K | $110,215 | +13,151 (+142.9%) | June 30, 2026 |
| 4 | BlackRock Inc | 0.96% | 20K | $99,527 | — | June 30, 2026 |
| 5 | Geode Capital Management, LLC | 0.74% | 16K | $76,578 | −3,814 (−19.7%) | June 30, 2026 |
| 6 | State Street Corp | 0.53% | 11K | $54,565 | +11,068 (0.0%) | June 30, 2026 |
| 7 | Scs Capital Management LLC | 0.52% | 11K | $54,230 | −761 (−6.5%) | June 30, 2026 |
| 8 | Vanguard Fiduciary Trust Co | 0.38% | 7,956 | $39,223 | +3,617 (+83.4%) | June 30, 2026 |
| 9 | JONES FINANCIAL COMPANIES LLLP | 0.04% | 886 | $4,368 | +886 (0.0%) | June 30, 2026 |
| 10 | Tower Research Capital LLC | 0.03% | 667 | $3,288 | −1,593 (−70.5%) | June 30, 2026 |
| 11 | Morgan Stanley - Brokerage Accounts | <0.01% | 77 | $380 | +77 (0.0%) | June 30, 2026 |
| 12 | UBS Group AG | <0.01% | 64 | $316 | −136 (−68.0%) | June 30, 2026 |
| 13 | Federation des caisses Desjardins du Quebec | <0.01% | 23 | $113 | — | June 30, 2026 |
| 14 | Wells Fargo & Co | <0.01% | 20 | $99 | — | June 30, 2026 |
| 15 | HARBOUR INVESTMENTS, INC. | <0.01% | 11 | $54 | +3 (+37.5%) | June 30, 2026 |
| 16 | SBI Securities Co Ltd | <0.01% | 10 | $49 | −3 (−23.1%) | June 30, 2026 |
| 17 | Caitong International Asset Management Co., Limited. | <0.01% | 6 | $30 | −4,031 (−99.9%) | June 30, 2026 |
| 18 | DRW Securities, LLC | 0.00% | — | — | −31,464 (−100.0%) | March 31, 2026 |
| 19 | Vanguard Global Advisers, LLC | 0.00% | — | — | −911 (−100.0%) | June 30, 2026 |
| 20 | Citigroup Inc | 0.00% | — | — | −6 (−100.0%) | March 31, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 7 holders added 84K shares and 9 cut 43K.
ASTC top mutual fund and ETF holders
7 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Fidelity Extended Market Index | 0.46% | 9,574 | $47,200 | +2,053 (+27.3%) | August 31, 2026 |
| 2 | Themes Transatlantic Defense ETF | 0.26% | 5,506 | $27,145 | −44 (−0.8%) | September 30, 2026 |
| 3 | Fidelity Total Market Index | 0.19% | 4,014 | $19,789 | — | August 31, 2026 |
| 4 | Abante Quant Value FI | 0.18% | 3,774 | $18,606 | +3,774 (0.0%) | August 31, 2026 |
| 5 | Fidelity Series Total Market Index | 0.09% | 1,978 | $9,752 | — | August 31, 2026 |
| 6 | Dimensional US Core Equity 2 ETF | 0.06% | 1,243 | $6,128 | — | September 30, 2026 |
| 7 | Fidelity Nasdaq Composite Index | 0.06% | 1,228 | $6,054 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
ASTC insider transactions
latest 2| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-10-03 | Braden Michael Leonard | Sell | $5.83 | 9,166 | $53,438 |
| 2025-10-03 | Braden Michael Leonard | Sell | $7.13 | 220,410 | $1.6M |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
ASTC shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns ASTC
Institutional investors own 10.5% of Astrotech's shares and insiders 14.75%. The largest holder is Jane Street Group LLC with 2.61% of the shares (55K), as of June 30, 2026. Among the top 20 institutions, 7 added shares and 9 reduced their stake in the latest filings. Short interest is 4.35% of the float, or 2.57 days of average trading volume. The share count rose 1,180.4% since 2014.
Related: ASTC key metrics. See the ASTC stock overview for the latest quote and news.
ASTC ownership FAQ
Who owns the most Astrotech stock?
The largest shareholders of Astrotech are Jane Street Group LLC (2.61%), J. Safra Sarasin Holding AG (1.30%), Vanguard Capital Management, LLC (1.06%), BlackRock Inc (0.96%), Geode Capital Management, LLC (0.74%).
What percentage of Astrotech is owned by institutions?
Institutions hold 10.5% of Astrotech's shares outstanding; insiders hold 14.75%.
Which funds own Astrotech?
The largest fund holders of Astrotech are Fidelity Extended Market Index (0.46%), Themes Transatlantic Defense ETF (0.26%), Fidelity Total Market Index (0.19%), Abante Quant Value FI (0.18%), Fidelity Series Total Market Index (0.09%).
What is Astrotech's short interest?
88K shares of Astrotech were sold short, 4.35% of the float; at the average daily volume it would take 2.57 days to cover.
Are insiders buying or selling Astrotech?
Of the latest 2 reported insider transactions in Astrotech (since October 3, 2025), 0 were purchases and 2 were sales.
How many shares of Astrotech are outstanding?
Astrotech has 2.1M shares outstanding, of which 1.7M are in the public float.