As of September 29, 2026, ASP Isotopes's top three insider holders are Jensen Investment Management Ltd Ak (TenPercentOwner, 6.75Mn shares), Jensen Investment Management Ltd Ak (TenPercentOwner, 6.65Mn shares), Jensen Investment Management Ltd Ak (TenPercentOwner, 6.57Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Jensen Investment Management Ltd Ak | TenPercentOwner | 0 | 19,960,622 | 19,960,622 | 57.2% | 16 Oct, 2024 |
| 2 | Paul Elliot Mann | Chief Executive Officer | 5,087,500 | 0 | 5,087,500 | 14.6% | 17 Feb, 2023 |
| 3 | Hendrik Strydom | Director, TenPercentOwner | 0 | 3,797,423 | 3,797,423 | 10.9% | 16 Nov, 2022 |
| 4 | Sergey Vasnetsov | Director | 0 | 2,800,000 | 2,800,000 | 8.0% | 16 Nov, 2022 |
| 5 | Joshua Jay Donfeld | Director | 1,000,000 | 0 | 1,000,000 | 2.9% | 16 Nov, 2022 |
| 6 | Robert Ainscow | Chief Financial Officer | 900,000 | 0 | 900,000 | 2.6% | 17 Feb, 2023 |
| 7 | Robert John Andrew Ryan | Director | 537,055 | 0 | 537,055 | 1.5% | 26 Feb, 2024 |
| 8 | Duncan Moore | Director | 400,000 | 0 | 400,000 | 1.1% | 16 Nov, 2022 |
| 9 | Todd Wider | Director | 400,000 | 0 | 400,000 | 1.1% | 16 Nov, 2022 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 11 Oct, 2024 | Jensen Investment Management Ltd Ak | TenPercentOwner | Acquired A | 30,000 | $3.03 | $90.77K | 6,746,874 | Indirect |
| 01 Aug, 2024 | Jensen Investment Management Ltd Ak | TenPercentOwner | Disposed S | 31,849 | $2.45 | $78.01K | 6,646,874 | Indirect |
| 02 Aug, 2024 | Jensen Investment Management Ltd Ak | TenPercentOwner | Disposed S | 80,000 | $2.23 | $178.30K | 6,566,874 | Indirect |
| 08 Jul, 2024 | Jensen Investment Management Ltd Ak | TenPercentOwner | Acquired P | 70,000 | $3.05 | $213.36K | 6,586,874 | Indirect |
| 09 Jul, 2024 | Jensen Investment Management Ltd Ak | TenPercentOwner | Acquired P | 30,000 | $3.05 | $91.50K | 6,616,874 | Indirect |
| 10 Jul, 2024 | Jensen Investment Management Ltd Ak | TenPercentOwner | Acquired P | 61,849 | $3.40 | $210.23K | 6,678,723 | Indirect |
| 14 Jan, 2024 | Robert John Andrew Ryan | Director | Acquired A | 50,251 | — | — | 518,709 | Direct |
| 16 Jan, 2024 | Robert John Andrew Ryan | Director | Acquired P | 2,550 | $1.92 | $4.90K | 521,259 | Direct |
| 17 Jan, 2024 | Robert John Andrew Ryan | Director | Acquired P | 100 | $1.91 | $191 | 521,359 | Direct |
| 25 Jan, 2024 | Robert John Andrew Ryan | Director | Acquired P | 100 | $2.54 | $254 | 521,459 | Direct |
| 29 Jan, 2024 | Robert John Andrew Ryan | Director | Acquired P | 15,596 | $2.35 | $36.65K | 537,055 | Direct |
| 30 Dec, 2022 | Robert Ainscow | Chief Financial Officer | Acquired A | 50,000 | $0.00 | $0 | 900,000 | Direct |
| 30 Dec, 2022 | Paul Elliot Mann | Chief Executive Officer | Acquired A | 1,000,000 | $0.00 | $0 | 5,087,500 | Direct |
| 15 Nov, 2022 | Duncan Moore | Director | Acquired A | 200,000 | $0.00 | $0 | 400,000 | Direct |
| 15 Nov, 2022 | Sergey Vasnetsov | Director | Acquired A | 600,000 | $0.00 | $0 | 2,800,000 | Indirect |
| 15 Nov, 2022 | Joshua Jay Donfeld | Director | Acquired A | 200,000 | $0.00 | $0 | 1,000,000 | Direct |
| 15 Nov, 2022 | Robert Ainscow | Chief Financial Officer | Acquired A | 600,000 | $0.00 | $0 | 850,000 | Direct |
| 15 Nov, 2022 | Todd Wider | Director | Acquired A | 200,000 | $0.00 | $0 | 400,000 | Direct |
| 15 Nov, 2022 | Hendrik Strydom | Director, TenPercentOwner | Acquired A | 200,000 | $0.00 | $0 | 3,797,423 | Indirect |
| 15 Nov, 2022 | Paul Elliot Mann | Chief Executive Officer | Acquired A | 37,500 | $4.00 | $150.00K | 3,087,500 | Direct |