9 insiders reported 63 Form 4 transactions for ASP Isotopes Inc. (ASPI) over the past 18 months (most recent 2026-07-02). Recent activity: Kiessling Heather (Chief Financial Officer) Sell 23,124 shares, Ainscow Donald George (EVP, Gen Counsel, Secretary) Sell 100,000 shares, Wider Todd (Director) Sell 50,000 shares, Gorley Michael (Director) Sell 30,000 shares, Wider Todd (Director) Sell 50,000 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-07-02 | Kiessling Heather | Chief Financial Officer | Sell | 23,124 | $145,219 |
| 2026-07-02 | Ainscow Donald George | EVP, Gen Counsel, Secretary | Sell | 100,000 | $614,000 |
| 2026-07-01 | Wider Todd | Director | Sell | 50,000 | $312,500 |
| 2026-07-01 | Gorley Michael | Director | Sell | 30,000 | $188,100 |
| 2026-07-01 | Wider Todd | Director | Sell | 50,000 | $306,000 |
| 2026-06-10 | Ainscow Robert | COO | Sell | 8,438 | $59,058 |
| 2026-06-03 | Mann Paul Elliot | Chairman and CEO | Buy | 2.2M | $0 |
| 2026-06-03 | Ainscow Robert | Chief Operating Officer | Buy | 800,000 | $0 |
| 2026-06-03 | Kiessling Heather | Chief Financial Officer | Buy | 840,000 | $0 |
| 2026-06-03 | Ainscow Donald George | EVP, Gen Counsel, Secretary | Buy | 400,000 | $0 |
| 2026-06-03 | Mann Paul Elliot | Chairman and CEO | Sell | 83,758 | $660,013 |
| 2026-06-03 | Mann Paul Elliot | Chairman and CEO | Sell | 83,758 | $694,354 |
| 2026-06-03 | Mann Paul Elliot | Chairman and CEO | Sell | 83,759 | $649,970 |
| 2026-04-17 | Moore Duncan | Director | Buy | 25,469 | $0 |
| 2026-04-17 | Ainscow Robert | COO | Sell | 22,500 | $117,112 |
| 2026-04-17 | Kiessling Heather | Chief Financial Officer | Sell | 23,124 | $126,673 |
| 2026-04-17 | Moore Duncan | Director | Buy | 36,548 | $0 |
| 2026-04-17 | Moore Duncan | Director | Sell | 11,642 | $60,597 |
| 2026-04-13 | Ainscow Robert | COO | Sell | 25,000 | $112,775 |
| 2026-03-06 | Ainscow Robert | COO | Sell | 8,438 | $45,903 |
| 2026-03-02 | Mann Paul Elliot | Executive Chairman | Buy | 162,153 | $882,112 |
| 2025-12-29 | Kiessling Heather | Chief Financial Officer | Sell | 80,000 | $464,000 |
| 2025-12-22 | Wider Todd | Director | Buy | 36,548 | $0 |
| 2025-12-22 | Gorley Michael | Director | Buy | 36,548 | $0 |
| 2025-12-22 | Ryan Robert John Andrew | Director | Buy | 36,548 | $0 |
Source: SEC Form 4 filings · as of 2026-07-02