ASP Isotopes (ASPI)
Develops isotope-enrichment technology across specialist isotopes, nuclear fuels, radiopharmacy, and helium.
$3.16
After hours−0.01 (−0.47%)
At close$3.18(−0.16%)
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13F · 13D/G · Form 4
| Institutions | 52.71% | 66.36M shares | |
|---|---|---|---|
| 202 holders · as of Jun 30, 2026 | |||
| Insiders | 11.48% | 14.46M shares | |
| 8 holders · as of Sep 4, 2026 | |||
| Strategic holders | 5.36% | 6.75M shares | |
| 1 holder · as of Oct 16, 2024 | |||
| Other | 30.45% | 38.34M shares | |
| remainder | |||
125.90M company shares as of Aug 23, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
13F, as of Jun 30, 2026
202 holders · 66.36M shares · 41 new positions · 119 increased · 51 reduced · 30 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 9.22M | 7.32% | +889.1K | Aug 7, 2026 |
| Encompass Capital Advisors LLC | 6.56M | 5.21% | −350.3K | Aug 14, 2026 |
| Vanguard Capital Management LLC | 4.98M | 3.96% | −77.5K | Aug 13, 2026 |
| Rovida Investment Management Ltd | 4.10M | 3.26% | 0 | Aug 5, 2026 |
| UBS Group AG | 3.25M | 2.58% | +405.9K | Aug 13, 2026 |
| Geode Capital Management, LLC | 2.95M | 2.34% | +205.4K | Aug 12, 2026 |
| Alyeska Investment Group, L.P. | 2.84M | 2.26% | +151.3K | Aug 14, 2026 |
| State Street Corp | 2.60M | 2.06% | +273.4K | Aug 7, 2026 |
13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Mann Paul Elliot | 7.00% | 7.76M | 13G | Feb 17, 2026 |
| AWM Investment Company, Inc. | 6.90% | 13G | Aug 14, 2025 | |
| BlackRock, Inc. | 6.60% | 8.27M | 13G | Apr 27, 2026 |
| AK Jensen Investment Management Limited | 6.60% | 4.71M | 13G | Feb 12, 2025 |
| AK Jensen Investment Management Ltd | 5.40% | 4.96M | 13G | Nov 14, 2025 |
| Encompass Capital Advisors LLC | 5.13% | 6.41M | 13G | Jan 23, 2026 |
Form 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Sep 8, 2026 | Robert Ainscowofficer: COO | Sale | 8,438 | $4.29 | 2,248,441 |
| Sep 2, 2026 | Robert Ainscowofficer: COO | Sale | 25,000 | $3.91 | 2,256,879 |
| Sep 2, 2026 | Donald George Ainscowofficer: EVP, Gen Counsel, Secretary | Sale | 23,678 | $3.89 | 776,322 |
| Sep 4, 2026 | Paul Elliot Manndirector, officer: Chairman and CEO | Sale | 83,759 | $4.10 | 9,328,570 |
| Sep 3, 2026 | Paul Elliot Manndirector, officer: Chairman and CEO | Sale | 83,758 | $3.92 | 9,412,329 |
| Sep 2, 2026 | Paul Elliot Manndirector, officer: Chairman and CEO | Sale | 83,758 | $3.91 | 9,496,087 |
| Jun 30, 2026 | Donald George Ainscowofficer: EVP, Gen Counsel, Secretary | Sale | 100,000 | $6.14 | 800,000 |
| Jul 1, 2026 | Heather Kiesslingofficer: Chief Financial Officer | Sale | 23,124 | $6.28 | 1,526,252 |
| Jun 30, 2026 | Michael Gorleydirector | Sale | 30,000 | $6.27 | 87,908 |
| Jun 30, 2026 | Todd Widerdirector | Sale | 50,000 | $6.12 | 672,247 |
House and Senate disclosures
Not reported.