ASPI · Insider Trading
ASP Isotopes Inc. Common Stock
Every open-market purchase and sale reported by ASPI officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-10-21 | Heather Kiessling | Chief Financial Officer | Sell | −21,830 | −$47.81K |
| 2026-10-16 | Robert Ainscow | COO | Sell | −22,500 | −$47.56K |
| 2026-10-01 | Robert John Andrew Ryan | Director | Buy | +15,000 | +$40.20K |
| 2026-09-30 | Robert John Andrew Ryan | Director | Buy | +8,000 | +$21.60K |
| 2026-09-10 | Robert Ainscow | COO | Sell | −8,438 | −$36.22K |
| 2026-09-04 | Donald George Ainscow | EVP, Gen Counsel, Secretary | Sell | −23,678 | −$92.11K |
| 2026-09-04 | Robert Ainscow | COO | Sell | −25,000 | −$97.62K |
| 2026-09-04 | Paul Elliot Mann | Chairman and CEO | Sell | −251,275 | −$999.24K |
| 2026-07-02 | Heather Kiessling | Chief Financial Officer | Sell | −23,124 | −$145.22K |
| 2026-07-02 | Donald George Ainscow | EVP, Gen Counsel, Secretary | Sell | −100,000 | −$614.00K |
| 2026-07-01 | Michael Gorley | Director | Sell | −30,000 | −$188.10K |
| 2026-07-01 | Todd Wider | Director | Sell | −100,000 | −$618.50K |
| 2026-06-10 | Robert Ainscow | COO | Sell | −8,438 | −$59.06K |
| 2026-06-03 | Heather Kiessling | Chief Financial Officer | A | +840,000 | — |
| 2026-06-03 | Robert Ainscow | Chief Operating Officer | A | +800,000 | — |
| 2026-06-03 | Donald George Ainscow | EVP, Gen Counsel, Secretary | A | +400,000 | — |
| 2026-06-03 | Paul Elliot Mann | Chairman and CEO | MIXED | +1,982,280 | −$2.00M |
| 2026-04-17 | Duncan Moore | Director | MIXED | +50,375 | −$60.60K |
| 2026-04-17 | Heather Kiessling | Chief Financial Officer | Sell | −23,124 | −$126.67K |
| 2026-04-17 | Robert Ainscow | COO | Sell | −22,500 | −$117.11K |
| 2026-04-13 | Robert Ainscow | COO | Sell | −25,000 | −$112.78K |
| 2026-03-06 | Robert Ainscow | COO | Sell | −8,438 | −$45.89K |
| 2026-03-02 | Paul Elliot Mann | Executive Chairman | Sell | +162,153 | +$881.46K |
| 2025-12-29 | Heather Kiessling | Chief Financial Officer | Sell | −80,000 | −$463.84K |
| 2025-12-22 | Todd Wider | Director | A | +36,548 | — |
| 2025-12-22 | Michael Gorley | Director | A | +36,548 | — |
| 2025-12-22 | Ralph L. Hunter JR | Director | A | +36,548 | — |
| 2025-12-22 | Robert John Andrew Ryan | Director | A | +36,548 | — |
| 2025-12-11 | Robert Ainscow | Interim CEO and COO | Sell | −8,438 | −$52.34K |
| 2025-12-03 | Paul Elliot Mann | Executive Chairman | Sell | −162,153 | −$932.87K |
| 2025-11-28 | Donald George Ainscow | EVP, Gen Counsel, Secretary | A | +400,000 | — |
| 2025-11-28 | Ralph L. Hunter JR | Director | A | +10,470 | — |
| 2025-11-28 | Robert Ainscow | Interim CEO and COO | Sell | −25,000 | −$144.22K |
| 2025-11-28 | Paul Elliot Mann | Executive Officer | Sell | −162,500 | −$1.13M |
| 2025-11-19 | Robert Ainscow | Interim CEO and COO | Sell | −67,500 | −$506.72K |
| 2025-11-14 | Todd Wider | Director | A | +25,469 | — |
| 2025-10-16 | Robert Ainscow | Interim CEO and COO | Sell | −22,500 | −$305.98K |
| 2025-10-03 | Todd Wider | Director | MIXED | — | −$648.82K |
| 2025-10-02 | Michael Gorley | Director | Sell | −64,000 | −$624.24K |
| 2025-09-10 | Paul Elliot Mann | Chief Executive Officer | MIXED | +768,737 | −$1.37M |
| 2025-09-10 | Robert Ainscow | Chief Operating Officer | MIXED | +249,701 | −$71.93K |
| 2025-09-03 | Duncan Moore | Director | Sell | −75,000 | −$696.23K |
| 2025-04-17 | Robert Ainscow | Chief Operating Officer | Sell | −200,000 | −$1.12M |
| 2025-04-17 | Paul Elliot Mann | Chief Executive Officer | Sell | −950,000 | −$5.33M |
| 2025-04-15 | Heather Kiessling | Chief Financial Officer | A | +400,000 | — |
| 2025-04-15 | Paul Elliot Mann | Chief Executive Officer | A | +1,441,361 | — |
| 2025-04-15 | Robert Ainscow | Chief Operating Officer | A | +400,000 | — |
| 2024-12-11 | Duncan Moore | Director | A | +172,864 | — |
| 2024-11-21 | Michael Gorley | Director | A | +42,522 | — |
| 2024-11-21 | Duncan Moore | Director | A | +42,522 | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Paul Elliot Mann | Chairman and CEO | 9,496,087 | $19.93M |
| Robert Ainscow | COO | 2,225,941 | $4.67M |
| Heather Kiessling | Chief Financial Officer | 1,526,252 | $3.20M |
| Duncan Moore | Director | 1,020,022 | $2.14M |
| Donald George Ainscow | EVP, Gen Counsel, Secretary | 776,322 | $1.63M |
| Todd Wider | Director | 722,247 | $1.52M |
| Robert John Andrew Ryan | Director | 675,222 | $1.42M |
| Michael Gorley | Director | 87,908 | $184.50K |
| Ralph L. Hunter JR | Director | 47,018 | $98.68K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the ASPI quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.