According to recent filings covering the 90 days ending January 02, 2026, the three most significant insider holders at Lantheus Holdings are Executive Chair Mary Anne Heino (512.24K shares), Svp And General Counsel Michael P Duffy (109.47K shares), Cfo And Treasurer Robert J. Jr. Marshall (88.13K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Rajiv A Patel | 3,477,227 | 21 Aug, 2025 | |
| Partners L L C/Ca Farallon | 3,477,227 | 21 Aug, 2025 | |
| Mary Anne Heino | Executive Chair | 512,235 | 19 Nov, 2025 |
| Brian A Markison | Ceo | 232,420 | 07 Mar, 2025 |
| Michael P Duffy | Svp And General Counsel | 109,472 | 20 Apr, 2021 |
| Paul Blanchfield | President | 108,214 | 15 Aug, 2025 |
| John J. Bolla | Chief Operations Officer | 102,440 | 18 Jun, 2021 |
| Etienne Montagut | Chief Business Officer | 94,651 | 07 Mar, 2024 |
| Robert J. Jr. Marshall | Cfo And Treasurer | 88,133 | 03 Sep, 2025 |
| Daniel Niedzwiecki | Nan | 87,057 | 17 Jun, 2025 |
| Carol Walker | Senior Vice President And Quality | 64,899 | 01 Apr, 2022 |
| Sam R Leno | 63,109 | 16 May, 2025 | |
| Andrea Sabens | Chief Accounting Officer | 60,420 | 17 Jul, 2024 |
| Istvan Molnar | Chief Medical Officer | 58,950 | 08 Mar, 2021 |
| A Frederick Robertson | 51,798 | 30 Apr, 2021 | |
| Amanda Michelle Morgan | Chief Commercial Officer | 39,580 | 07 Mar, 2025 |
| Jean-Claude Provost | Chief Medical Officer | 38,841 | 07 Mar, 2024 |
| James H Thrall | 35,744 | 16 May, 2025 | |
| Ying Vivian Yao | Chief Human Resources Officer | 30,319 | 07 Mar, 2022 |
| Julie Mchugh | 25,962 | 11 Jun, 2025 | |
| Heinz Christoph Maeusli | 25,877 | 16 May, 2025 | |
| Gerard Ber | 23,362 | 16 May, 2025 | |
| Gary J Pruden | 17,150 | 16 May, 2025 | |
| Ludger Dinkelborg | Nan | 14,765 | 19 Aug, 2025 |
| Minnie Baylor-Henry | 9,881 | 16 May, 2025 | |
| Jeffrey Humphrey | Chief Medical Officer | 9,076 | 20 Jun, 2024 |
| Kimberly Brown | Chief Accounting Officer | 7,701 | 19 Aug, 2025 |
| Julia Marie Eastland | 3,882 | 16 May, 2025 | |
| Phuong Khanh Morrow | 3,100 | 16 May, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 17 Nov, 2025 | Mary Anne Heino | Common Stock | A | 14,285 | $0.00 | 332,935 | D | A |
| 29 Aug, 2025 | Robert J. Jr. Marshall | - | - | 88,133 | D | |||
| 29 Aug, 2025 | Robert J. Jr. Marshall | Common Stock | D | 727 | $54.90 | 88,133 | D | F |
| 19 Aug, 2025 | Rajiv A Patel | Common Stock | D | 41,000 | $55.34 | 6,842,227 | I | S |
| 19 Aug, 2025 | Partners L L C/Ca Farallon | Common Stock | D | 41,000 | $55.34 | 6,842,227 | I | S |
| 19 Aug, 2025 | Partners L L C/Ca Farallon | - | - | 6,842,227 | I | |||
| 20 Aug, 2025 | Partners L L C/Ca Farallon | - | - | 3,477,227 | I | |||
| 20 Aug, 2025 | Rajiv A Patel | Common Stock | D | 3,365,000 | $56.15 | 3,477,227 | I | S |
| 20 Aug, 2025 | Partners L L C/Ca Farallon | Common Stock | D | 3,365,000 | $56.15 | 3,477,227 | I | S |
| 15 Aug, 2025 | Ludger Dinkelborg | Common Stock | A | 14,765 | $0.00 | 14,765 | D | A |
| 15 Aug, 2025 | Kimberly Brown | Common Stock | D | 463 | $54.18 | 7,701 | D | F |
| 15 Aug, 2025 | Kimberly Brown | - | - | 7,701 | D | |||
| 13 Aug, 2025 | Paul Blanchfield | Common Stock | D | 3,060 | $53.57 | 108,214 | D | S |
| 15 Jul, 2025 | Paul Blanchfield | - | - | 111,274 | D | |||
| 15 Jul, 2025 | Paul Blanchfield | Common Stock | D | 518 | $81.26 | 111,274 | D | F |
| 13 Jun, 2025 | Daniel Niedzwiecki | Common Stock | D | 6,000 | $78.74 | 87,057 | D | S |
| 09 Jun, 2025 | Julie Mchugh | Common Stock | D | 5,192 | $81.62 | 25,962 | D | S |
| 09 Jun, 2025 | Robert J. Jr. Marshall | Common Stock | A | 14,773 | $49.93 | 128,633 | D | M |
| 09 Jun, 2025 | Robert J. Jr. Marshall | Common Stock | D | 3,494 | $81.27 | 125,139 | D | S |
| 09 Jun, 2025 | Robert J. Jr. Marshall | Common Stock | D | 9,243 | $82.50 | 115,896 | D | S |