ASPI insider transaction filings
ASP Isotopes Inc. — 50 most recent Form 4 filings from SEC EDGAR, normalized by FilingPulse. Latest filing: 2026-09-10. Screen ASPI transaction legs live →
Insider transaction summary — last 90 days
2026-06-24 to 2026-09-22, from the filings listed below: 8 Form 4 filings. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): none reported.
- Open-market sales (code S, non-derivative): 11 legs across 8 filings by 6 insiders — 561,515 shares, $2,791,004 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 0.
- Largest priced transaction: sale of 100,000 shares @ $6.14 ($614,000) by Ainscow Donald George, filed 2026-07-02.
By insider — same window
Open-market purchase/sale legs on non-derivative securities, grouped by the filing's reporting owner(s); joint filings appear once. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Insider | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|
| Mann Paul Elliot — Chairman and CEO, Director | 1 | — | 3 legs · 251,275 sh · $999,237 | — |
| Ainscow Donald George — EVP, Gen Counsel, Secretary | 2 | — | 2 legs · 123,678 sh · $706,107 | — |
| Wider Todd — Director | 1 | — | 2 legs · 100,000 sh · $618,500 | — |
| Gorley Michael — Director | 1 | — | 1 leg · 30,000 sh · $188,100 | — |
| Kiessling Heather — Chief Financial Officer | 1 | — | 1 leg · 23,124 sh · $145,219 | — |
| Ainscow Robert — COO | 2 | — | 2 legs · 33,438 sh · $133,841 | — |
Recent Form 4 filings — ASP Isotopes Inc.
| Filed | Form | Insider | Reported transactions | Source |
|---|---|---|---|---|
| 2026-09-10 | 4 | Ainscow Robert — COO | Sale (S): 8,438 @ $4.29 | EDGAR |
| 2026-09-04 | 4 | Ainscow Donald George — EVP, Gen Counsel, Secretary | Sale (S): 23,678 @ $3.89 | EDGAR |
| 2026-09-04 | 4 | Mann Paul Elliot — Chairman and CEO, Director | Sale (S): 83,758 @ $3.91 · Sale (S): 83,758 @ $3.92 · Sale (S): 83,759 @ $4.10 | EDGAR |
| 2026-09-04 | 4 | Ainscow Robert — COO | Sale (S): 25,000 @ $3.90 | EDGAR |
| 2026-07-02 | 4 | Kiessling Heather — Chief Financial Officer | Sale (S): 23,124 @ $6.28 | EDGAR |
| 2026-07-02 | 4 | Ainscow Donald George — EVP, Gen Counsel, Secretary | Sale (S): 100,000 @ $6.14 | EDGAR |
| 2026-07-01 | 4 | Gorley Michael — Director | Sale (S): 30,000 @ $6.27 | EDGAR |
| 2026-07-01 | 4 | Wider Todd — Director | Sale (S): 50,000 @ $6.25 · Sale (S): 50,000 @ $6.12 | EDGAR |
| 2026-06-10 | 4 | Ainscow Robert — COO | Sale (S): 8,438 @ $7.00 | EDGAR |
| 2026-06-03 | 4 | Ainscow Robert — Chief Operating Officer | Grant/award (A): 800,000 | EDGAR |
| 2026-06-03 | 4 | Ainscow Donald George — EVP, Gen Counsel, Secretary | Grant/award (A): 400,000 | EDGAR |
| 2026-06-03 | 4 | Kiessling Heather — Chief Financial Officer | Grant/award (A): 840,000 | EDGAR |
| 2026-06-03 | 4 | Mann Paul Elliot — Chairman and CEO, Director | Grant/award (A): 2,233,555 · Sale (S): 83,758 @ $7.88 · Sale (S): 83,758 @ $8.29 · Sale (S): 83,759 @ $7.76 | EDGAR |
| 2026-04-17 | 4 | Ainscow Robert — COO | Sale (S): 22,500 @ $5.21 | EDGAR |
| 2026-04-17 | 4 | Kiessling Heather — Chief Financial Officer | Sale (S): 23,124 @ $5.48 | EDGAR |
| 2026-04-17 | 4 | Moore Duncan — Director | Grant/award (A): 25,469 · Grant/award (A): 36,548 · Sale (S): 11,642 @ $5.21 | EDGAR |
| 2026-04-13 | 4 | Ainscow Robert — COO | Sale (S): 25,000 @ $4.51 | EDGAR |
| 2026-03-06 | 4 | Ainscow Robert — COO | Sale (S): 8,438 @ $5.44 | EDGAR |
| 2026-03-02 | 4 | Mann Paul Elliot — Executive Chairman | Sale (S): 162,153 @ $5.44 | EDGAR |
| 2025-12-29 | 4 | Kiessling Heather — Chief Financial Officer | Sale (S): 80,000 @ $5.80 | EDGAR |
| 2025-12-22 | 4 | Ryan Robert John Andrew — Director | Grant/award (A): 36,548 | EDGAR |
| 2025-12-22 | 4 | Hunter Ralph L. JR — Director | Grant/award (A): 36,548 | EDGAR |
| 2025-12-22 | 4 | Gorley Michael — Director | Grant/award (A): 36,548 | EDGAR |
| 2025-12-22 | 4 | Wider Todd — Director | Grant/award (A): 36,548 | EDGAR |
| 2025-12-11 | 4 | Ainscow Robert — Interim CEO and COO | Sale (S): 8,438 @ $6.20 | EDGAR |
| 2025-12-03 | 4 | Mann Paul Elliot — Executive Chairman, Director | Sale (S): 162,153 @ $5.75 | EDGAR |
| 2025-11-28 | 4 | Hunter Ralph L. JR — Director | Grant/award (A): 10,470 | EDGAR |
| 2025-11-28 | 4 | Ainscow Donald George — EVP, Gen Counsel, Secretary | Grant/award (A): 400,000 | EDGAR |
| 2025-11-28 | 4 | Ainscow Robert — Interim CEO and COO | Sale (S): 25,000 @ $5.77 | EDGAR |
| 2025-11-28 | 4 | Mann Paul Elliot — Executive Officer, Director | Sale (S): 112,500 @ $7.51 · Sale (S): 50,000 @ $5.77 | EDGAR |
| 2025-11-19 | 4 | Ainscow Robert — Interim CEO and COO | Sale (S): 67,500 @ $7.51 | EDGAR |
| 2025-11-14 | 4 | Wider Todd — Director | Grant/award (A): 25,469 | EDGAR |
| 2025-10-16 | 4 | Ainscow Robert — Interim CEO and COO | Sale (S): 22,500 @ $13.60 | EDGAR |
| 2025-10-03 | 4 | Wider Todd — Director | Option exercise (M): 96,000 @ $2 · Tax withholding (F): 21,892 @ $8.77 · Sale (S): 74,108 @ $8.76 · Option exercise (M): 96,000 (derivative) @ $0 | EDGAR |
| 2025-10-02 | 4 | Gorley Michael — Director | Sale (S): 64,000 @ $9.75 | EDGAR |
| 2025-09-10 | 4 | Ainscow Robert — Chief Operating Officer | Sale (S): 8,438 @ $8.53 · Option exercise (M): 150,000 @ $0.25 · Tax withholding (F): 4,396 @ $8.53 · Option exercise (M): 12,000 @ $2 · Tax withholding (F): 2,813 @ $8.53 · Option exercise (M): 135,000 @ $2 · +4 more | EDGAR |
| 2025-09-10 | 4 | Mann Paul Elliot — Chief Executive Officer, Director, 10% owner | Sale (S): 81,076 @ $8.53 · Option exercise (M): 216,000 @ $2 · Tax withholding (F): 50,644 @ $8.53 · Option exercise (M): 1,000,000 @ $2 · Tax withholding (F): 234,466 @ $8.53 · Sale (S): 81,077 @ $8.39 · +2 more | EDGAR |
| 2025-09-03 | 4 | Moore Duncan — Director | Sale (S): 75,000 @ $9.28 | EDGAR |
| 2025-04-17 | 4 | Ainscow Robert — Chief Operating Officer | Sale (S): 66,666 @ $5.75 · Sale (S): 66,666 @ $5.45 · Sale (S): 66,668 @ $5.62 | EDGAR |
| 2025-04-17 | 4 | Mann Paul Elliot — Chief Executive Officer, Director, 10% owner | Sale (S): 316,667 @ $5.75 · Sale (S): 316,667 @ $5.45 · Sale (S): 316,666 @ $5.62 | EDGAR |
| 2025-04-15 | 4 | Ainscow Robert — Chief Operating Officer | Grant/award (A): 400,000 | EDGAR |
| 2025-04-15 | 4 | Kiessling Heather — Chief Financial Officer | Grant/award (A): 400,000 | EDGAR |
| 2025-04-15 | 4 | Mann Paul Elliot — Chief Executive Officer, Director, 10% owner | Grant/award (A): 1,441,361 | EDGAR |
| 2024-12-11 | 4 | Moore Duncan — Director | Grant/award (A): 77,626 · Grant/award (A): 95,238 | EDGAR |
| 2024-11-21 | 4 | Ryan Robert John Andrew — Director | Grant/award (A): 42,522 | EDGAR |
| 2024-11-21 | 4 | Gorley Michael — Director | Grant/award (A): 42,522 | EDGAR |
| 2024-11-21 | 4 | Moore Duncan — Director | Grant/award (A): 42,522 | EDGAR |
| 2024-11-21 | 4 | Wider Todd — Director | Grant/award (A): 42,522 | EDGAR |
| 2024-10-16 | 4 | AK Jensen Investment Management Ltd — 10% owner | Grant/award (A): 30,000 @ $3.03 | EDGAR |
| 2024-09-10 | 4 | Mann Paul Elliot — Chief Executive Officer, Director, 10% owner | Grant/award (A): 978,466 | EDGAR |
Recent 8-K events — ASP Isotopes Inc.
| Filed | Form | Items reported | Source |
|---|---|---|---|
| 2026-09-08 | 8-K | 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-08-20 | 8-K | 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-08-20 | 8-K | 1.01 — Entry into a Material Definitive Agreement 1.02 — Termination of a Material Definitive Agreement 2.03 — Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-08-18 | 8-K | 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-08-06 | 8-K | 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-08-05 | 8-K | 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-08-04 | 8-K | 2.02 — Results of Operations and Financial Condition 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-07-30 | 8-K | 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-07-28 | 8-K | 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-07-21 | 8-K | 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
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