ASPI
ASP Isotopes Inc. Common Stock$2.00-0.14 (-6.45%)Prev Close$2.13·MCap$311.2M·P/E—·Vol2.63M·Yield—
▲
Buys (12M)
2
$61.8K
▼
Sells (12M)
24
$9.53M
◆
Net Activity
Net Seller
$9.47M
●
Active Insiders
8
last 12 mo
Over the past 12 months, insider activity at ASP Isotopes Inc. Common Stock (ASPI) has been dominated by selling, with 2 insider purchases totaling $61.8K and 24 insider sales totaling $9.53M. The most recent insider transaction was by Kiessling Heather (officer: Chief Financial Officer), who sold $47.8K worth of shares on Oct 21, 2026. ASP Isotopes Inc. Common Stock operates in the Basic Materials sector, within the Chemicals - Specialty industry, with a market cap of $311.2M.
ASPI Insider Trading Activity
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Oct 21, 2026 | Kiessling Heather | officer: Chief Financial Officer | Sell | 21,830 | $2.19 | $47.8K | 1,504,422 |
| Oct 16, 2026 | Ainscow Robert | officer: COO | Sell | 22,500 | $2.11 | $47.6K | 2,225,941 |
| Oct 1, 2026 | Ryan Robert John Andrew | director | Buy | 15,000 | $2.68 | $40.2K | 675,222 |
| Sep 30, 2026 | Ryan Robert John Andrew | director | Buy | 8,000 | $2.70 | $21.6K | 660,222 |
| Sep 10, 2026 | Ainscow Robert | officer: COO | Sell | 8,438 | $4.29 | $36.2K | 2,248,441 |
| Sep 4, 2026 | Mann Paul Elliot | director, officer: Chairman and CEO | Sell | 251,275 | $3.98 | $999.2K | 9,496,087 |
| Sep 4, 2026 | Ainscow Robert | officer: COO | Sell | 25,000 | $3.91 | $97.6K | 2,256,879 |
| Sep 4, 2026 | Ainscow Donald George | officer: EVP, Gen Counsel, Secretary | Sell | 23,678 | $3.89 | $92.1K | 776,322 |
| Jul 2, 2026 | Kiessling Heather | officer: Chief Financial Officer | Sell | 23,124 | $6.28 | $145.2K | 1,526,252 |
| Jul 2, 2026 | Ainscow Donald George | officer: EVP, Gen Counsel, Secretary | Sell | 100,000 | $6.14 | $614.0K | 800,000 |
| Jul 1, 2026 | Gorley Michael | director | Sell | 30,000 | $6.27 | $188.1K | 87,908-25% |
| Jul 1, 2026 | Wider Todd | director | Sell | 100,000 | $6.19 | $618.5K | 722,247 |
| Jun 10, 2026 | Ainscow Robert | officer: COO | Sell | 8,438 | $7.00 | $59.1K | 2,281,879 |
| Jun 3, 2026 | Mann Paul Elliot | director, officer: Chairman and CEO | Sell | 251,275 | $7.98 | $2.00M | 9,747,182 |
| Apr 17, 2026 | Moore Duncan | director | Sell | 11,642 | $5.20 | $60.6K | 1,044,928 |
| Apr 17, 2026 | Ainscow Robert | officer: COO | Sell | 22,500 | $5.21 | $117.1K | 1,490,317 |
| Apr 17, 2026 | Kiessling Heather | officer: Chief Financial Officer | Sell | 23,124 | $5.48 | $126.7K | 709,376 |
| Apr 13, 2026 | Ainscow Robert | officer: COO | Sell | 25,000 | $4.51 | $112.8K | 1,512,817 |
| Mar 6, 2026 | Ainscow Robert | officer: COO | Sell | 8,438 | $5.44 | $45.9K | 1,537,817 |
| Mar 2, 2026 | Mann Paul Elliot | officer: Executive Chairman | Sell | 162,153 | $5.44 | $881.5K | 7,597,385 |
| Dec 18, 2025 | Kiessling Heather | Chief Financial Officer | Sell | 80,000 | $5.80 | $463.8K | 0 |
| Dec 8, 2025 | Ainscow Robert | Interim CEO and COO | Sell | 8,438 | $6.20 | $52.3K | 0 |
| Dec 1, 2025 | Mann Paul Elliot | Executive Chairman | Sell | 162,153 | $5.75 | $932.9K | 0 |
| Nov 25, 2025 | Ainscow Robert | Interim CEO and COO | Sell | 25,000 | $5.77 | $144.2K | 0 |
| Nov 17, 2025 | Ainscow Robert | Interim CEO and COO | Sell | 67,500 | $7.51 | $506.7K | 0 |
| Nov 17, 2025 | Mann Paul Elliot | Executive Officer | Sell | 162,500 | $6.97 | $1.13M | 0 |
| Oct 14, 2025 | Ainscow Robert | Interim CEO and COO | Sell | 22,500 | $13.60 | $306.0K | 0 |
| Sep 30, 2025 | Gorley Michael | Director | Sell | 64,000 | $9.75 | $624.2K | 0 |
| Sep 14, 2025 | Wider Todd | Director | Sell | 96,000 | $8.76 | $840.8K | 0 |
| Sep 8, 2025 | Ainscow Robert | Chief Operating Officer | Sell | 47,299 | $8.53 | $403.4K | 0 |
| Sep 8, 2025 | Mann Paul Elliot | Chief Executive Officer | Sell | 447,263 | $8.50 | $3.80M | 0 |
| Aug 29, 2025 | Moore Duncan | Director | Sell | 75,000 | $9.28 | $696.2K | 0 |
| Apr 15, 2025 | Ainscow Robert | Chief Operating Officer | Sell | 200,000 | $5.61 | $1.12M | 0 |
| Apr 15, 2025 | Mann Paul Elliot | Chief Executive Officer | Sell | 950,000 | $5.61 | $5.33M1.0% OS | 0 |
| Apr 29, 2024 | Ryan Robert John Andrew | Director | Buy | 20,547 | $3.38 | $69.5K | 0 |
| Apr 26, 2024 | Ryan Robert John Andrew | Director | Buy | 5,000 | $3.48 | $17.4K | 0 |
| Apr 25, 2024 | Ryan Robert John Andrew | Director | Buy | 9,500 | $3.42 | $32.5K | 0 |
| Jan 14, 2024 | Ryan Robert John Andrew | Director | Buy | 18,346 | $2.29 | $42.0K | 0 |
| Oct 26, 2023 | Wider Todd | Director | Buy | 94,844 | $0.96 | $91.1K | 0 |
| Aug 10, 2023 | Moore Duncan | Director | Buy | 104,167 | $0.96 | $100.0K | 0 |
| Jun 29, 2023 | Moore Duncan | Director | Buy | 50,000 | $0.50 | $25.0K | 0 |
| May 18, 2023 | Moore Duncan | Director | Buy | 20,000 | $0.31 | $6.2K | 0 |
| May 10, 2023 | Moore Duncan | Director | Buy | 10,000 | $0.50 | $5.0K | 0 |
| Apr 6, 2023 | Moore Duncan | Director | Buy | 20,000 | $1.00 | $20.0K | 0 |
ASPI Insider Buying Activity
The following table shows recent insider purchases of ASP Isotopes Inc. Common Stock (ASPI) stock reported via SEC Form 4 filings.
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Oct 1, 2026 | Ryan Robert John Andrew | director | Buy | 15,000 | $2.68 | $40.2K | 675,222 |
| Sep 30, 2026 | Ryan Robert John Andrew | director | Buy | 8,000 | $2.70 | $21.6K | 660,222 |
| Apr 29, 2024 | Ryan Robert John Andrew | Director | Buy | 20,547 | $3.38 | $69.5K | 0 |
| Apr 26, 2024 | Ryan Robert John Andrew | Director | Buy | 5,000 | $3.48 | $17.4K | 0 |
| Apr 25, 2024 | Ryan Robert John Andrew | Director | Buy | 9,500 | $3.42 | $32.5K | 0 |
| Jan 14, 2024 | Ryan Robert John Andrew | Director | Buy | 18,346 | $2.29 | $42.0K | 0 |
| Oct 26, 2023 | Wider Todd | Director | Buy | 94,844 | $0.96 | $91.1K | 0 |
| Aug 10, 2023 | Moore Duncan | Director | Buy | 104,167 | $0.96 | $100.0K | 0 |
| Jun 29, 2023 | Moore Duncan | Director | Buy | 50,000 | $0.50 | $25.0K | 0 |
| May 18, 2023 | Moore Duncan | Director | Buy | 20,000 | $0.31 | $6.2K | 0 |
| May 10, 2023 | Moore Duncan | Director | Buy | 10,000 | $0.50 | $5.0K | 0 |
| Apr 6, 2023 | Moore Duncan | Director | Buy | 20,000 | $1.00 | $20.0K | 0 |
ASPI Insider Selling Activity
The following table shows recent insider sales of ASP Isotopes Inc. Common Stock (ASPI) stock reported via SEC Form 4 filings.
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Oct 21, 2026 | Kiessling Heather | officer: Chief Financial Officer | Sell | 21,830 | $2.19 | $47.8K | 1,504,422 |
| Oct 16, 2026 | Ainscow Robert | officer: COO | Sell | 22,500 | $2.11 | $47.6K | 2,225,941 |
| Sep 10, 2026 | Ainscow Robert | officer: COO | Sell | 8,438 | $4.29 | $36.2K | 2,248,441 |
| Sep 4, 2026 | Mann Paul Elliot | director, officer: Chairman and CEO | Sell | 251,275 | $3.98 | $999.2K | 9,496,087 |
| Sep 4, 2026 | Ainscow Robert | officer: COO | Sell | 25,000 | $3.91 | $97.6K | 2,256,879 |
| Sep 4, 2026 | Ainscow Donald George | officer: EVP, Gen Counsel, Secretary | Sell | 23,678 | $3.89 | $92.1K | 776,322 |
| Jul 2, 2026 | Kiessling Heather | officer: Chief Financial Officer | Sell | 23,124 | $6.28 | $145.2K | 1,526,252 |
| Jul 2, 2026 | Ainscow Donald George | officer: EVP, Gen Counsel, Secretary | Sell | 100,000 | $6.14 | $614.0K | 800,000 |
| Jul 1, 2026 | Gorley Michael | director | Sell | 30,000 | $6.27 | $188.1K | 87,908-25% |
| Jul 1, 2026 | Wider Todd | director | Sell | 100,000 | $6.19 | $618.5K | 722,247 |
| Jun 10, 2026 | Ainscow Robert | officer: COO | Sell | 8,438 | $7.00 | $59.1K | 2,281,879 |
| Jun 3, 2026 | Mann Paul Elliot | director, officer: Chairman and CEO | Sell | 251,275 | $7.98 | $2.00M | 9,747,182 |
| Apr 17, 2026 | Moore Duncan | director | Sell | 11,642 | $5.20 | $60.6K | 1,044,928 |
| Apr 17, 2026 | Ainscow Robert | officer: COO | Sell | 22,500 | $5.21 | $117.1K | 1,490,317 |
| Apr 17, 2026 | Kiessling Heather | officer: Chief Financial Officer | Sell | 23,124 | $5.48 | $126.7K | 709,376 |
| Apr 13, 2026 | Ainscow Robert | officer: COO | Sell | 25,000 | $4.51 | $112.8K | 1,512,817 |
| Mar 6, 2026 | Ainscow Robert | officer: COO | Sell | 8,438 | $5.44 | $45.9K | 1,537,817 |
| Mar 2, 2026 | Mann Paul Elliot | officer: Executive Chairman | Sell | 162,153 | $5.44 | $881.5K | 7,597,385 |
| Dec 18, 2025 | Kiessling Heather | Chief Financial Officer | Sell | 80,000 | $5.80 | $463.8K | 0 |
| Dec 8, 2025 | Ainscow Robert | Interim CEO and COO | Sell | 8,438 | $6.20 | $52.3K | 0 |
| Dec 1, 2025 | Mann Paul Elliot | Executive Chairman | Sell | 162,153 | $5.75 | $932.9K | 0 |
| Nov 25, 2025 | Ainscow Robert | Interim CEO and COO | Sell | 25,000 | $5.77 | $144.2K | 0 |
| Nov 17, 2025 | Ainscow Robert | Interim CEO and COO | Sell | 67,500 | $7.51 | $506.7K | 0 |
| Nov 17, 2025 | Mann Paul Elliot | Executive Officer | Sell | 162,500 | $6.97 | $1.13M | 0 |
| Oct 14, 2025 | Ainscow Robert | Interim CEO and COO | Sell | 22,500 | $13.60 | $306.0K | 0 |
| Sep 30, 2025 | Gorley Michael | Director | Sell | 64,000 | $9.75 | $624.2K | 0 |
| Sep 14, 2025 | Wider Todd | Director | Sell | 96,000 | $8.76 | $840.8K | 0 |
| Sep 8, 2025 | Ainscow Robert | Chief Operating Officer | Sell | 47,299 | $8.53 | $403.4K | 0 |
| Sep 8, 2025 | Mann Paul Elliot | Chief Executive Officer | Sell | 447,263 | $8.50 | $3.80M | 0 |
| Aug 29, 2025 | Moore Duncan | Director | Sell | 75,000 | $9.28 | $696.2K | 0 |
| Apr 15, 2025 | Ainscow Robert | Chief Operating Officer | Sell | 200,000 | $5.61 | $1.12M | 0 |
| Apr 15, 2025 | Mann Paul Elliot | Chief Executive Officer | Sell | 950,000 | $5.61 | $5.33M1.0% OS | 0 |
ASPI Insiders
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