As of September 09, 2026, Perspective Therapeutics's top three insider holders are Holdings, Inc. Lantheus (TenPercentOwner, 11.56Mn shares), Alpha Therapy, Llc Lantheus (TenPercentOwner, 11.27Mn shares), Markus Puhlmann (Chief Medical Officer, 1.38Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Holdings, Inc. Lantheus | TenPercentOwner | 11,563,425 | 0 | 11,563,425 | 46.8% | 03 Sep, 2026 |
| 2 | Alpha Therapy, Llc Lantheus | TenPercentOwner | 11,273,364 | 0 | 11,273,364 | 45.7% | 08 Sep, 2026 |
| 3 | Markus Puhlmann | Chief Medical Officer | 1,375,425 | 0 | 1,375,425 | 5.6% | 26 Jan, 2024 |
| 4 | Lori A Woods | Ceo | 0 | 183,460 | 183,460 | 0.7% | 01 Apr, 2025 |
| 5 | Jennifer Streeter | Coo Vp Of Hr | 77,940 | 0 | 77,940 | 0.3% | 22 Sep, 2022 |
| 6 | Johan M. Spoor | Chief Executive Officer | 59,383 | 4,650 | 64,033 | 0.3% | 01 Apr, 2025 |
| 7 | Jonathan Robert Hunt | Chief Accounting Officer | 59,800 | 0 | 59,800 | 0.2% | 17 Nov, 2025 |
| 8 | Juan Graham | Chief Financial Officer | 35,354 | 0 | 35,354 | 0.1% | 01 Apr, 2025 |
| 9 | Heidi Henson | Director | 0 | 25,975 | 25,975 | 0.1% | 06 Dec, 2024 |
| 10 | Mark John Austin | Vp Finance/Prin Finacct Offic | 13,806 | 0 | 13,806 | 0.1% | 24 Apr, 2024 |
| 11 | Robert F Iii Williamson | Director | 0 | 9,864 | 9,864 | 0.0% | 14 Nov, 2025 |
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 |
|---|---|---|---|---|---|---|---|---|
| 03 Sep, 2026 | Alpha Therapy, Llc Lantheus | TenPercentOwner | Disposed S | 80,783 | $3.11 | $250.90K | 11,440,513 | Direct |
| 04 Sep, 2026 | Alpha Therapy, Llc Lantheus | TenPercentOwner | Disposed S | 167,149 | $3.15 | $526.05K | 11,273,364 | Direct |
| 02 Sep, 2026 | Alpha Therapy, Llc Lantheus | TenPercentOwner | Disposed S | 42,129 | $3.11 | $131.22K | 11,521,296 | Direct |
| 31 Aug, 2026 | Alpha Therapy, Llc Lantheus | TenPercentOwner | Disposed S | 78,145 | $3.14 | $245.61K | 11,599,194 | Direct |
| 01 Sep, 2026 | Alpha Therapy, Llc Lantheus | TenPercentOwner | Disposed S | 35,769 | $3.12 | $111.57K | 11,563,425 | Direct |
| 02 Mar, 2026 | Maria E Martinez | Director | Acquired A | 50,000 | $0.00 | $0 | 50,000 | Direct |
| 02 Mar, 2026 | Robert F Iii Williamson | Director | Acquired A | 50,000 | $0.00 | $0 | 50,000 | Direct |
| 02 Mar, 2026 | Johan M. Spoor | Chief Executive Officer | Acquired A | 735,000 | $0.00 | $0 | 735,000 | Direct |
| 02 Mar, 2026 | Jonathan Robert Hunt | Chief Accounting Officer | Acquired A | 90,000 | $0.00 | $0 | 90,000 | Direct |
| 02 Mar, 2026 | Johan M. Spoor | Chief Executive Officer | Acquired A | 735,000 | $0.00 | $0 | 735,000 | Direct |
| 02 Mar, 2026 | Frank Morich | Director | Acquired A | 50,000 | $0.00 | $0 | 50,000 | Direct |
| 02 Mar, 2026 | Robert F Iii Williamson | Director | Acquired A | 50,000 | $0.00 | $0 | 50,000 | Direct |
| 02 Mar, 2026 | Robert F Iii Williamson | Director | Acquired A | 50,000 | $0.00 | $0 | 50,000 | Direct |
| 02 Mar, 2026 | Markus Puhlmann | Chief Medical Officer | Acquired A | 150,000 | $0.00 | $0 | 150,000 | Direct |
| 02 Mar, 2026 | Lori A Woods | Director | Acquired A | 50,000 | $0.00 | $0 | 50,000 | Direct |
| 02 Mar, 2026 | Lori A Woods | Director | Acquired A | 50,000 | $0.00 | $0 | 50,000 | Direct |
| 02 Mar, 2026 | Markus Puhlmann | Chief Medical Officer | Acquired A | 150,000 | $0.00 | $0 | 150,000 | Direct |
| 02 Mar, 2026 | Markus Puhlmann | Chief Medical Officer | Acquired A | 150,000 | $0.00 | $0 | 150,000 | Direct |
| 02 Mar, 2026 | Johan M. Spoor | Chief Executive Officer | Acquired A | 735,000 | $0.00 | $0 | 735,000 | Direct |
| 02 Mar, 2026 | Lori A Woods | Director | Acquired A | 50,000 | $0.00 | $0 | 50,000 | Direct |