Lantheus Holdings's three largest insider shareholders as of September 29, 2026 are Partners L L C/Ca Farallon (TenPercentOwner, 3.48Mn shares), Rajiv A Patel (Other, 3.48Mn shares), Mary Anne Heino (Ceo, 419.40K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Partners L L C/Ca Farallon | TenPercentOwner, Other | 0 | 3,477,227 | 3,477,227 | 40.9% | 21 Aug, 2025 |
| 2 | Rajiv A Patel | Other | 0 | 3,477,227 | 3,477,227 | 40.9% | 21 Aug, 2025 |
| 3 | Mary Anne Heino | Executive Chair And Ceo | 321,897 | 0 | 321,897 | 3.8% | 03 Jun, 2026 |
| 4 | Brian A Markison | Ceo | 232,420 | 0 | 232,420 | 2.7% | 07 Mar, 2025 |
| 5 | Robert J. Jr. Marshall | Cfo And Treasurer | 122,071 | 0 | 122,071 | 1.4% | 02 Sep, 2026 |
| 6 | Daniel Niedzwiecki | Officer | 117,465 | 0 | 117,465 | 1.4% | 21 Apr, 2026 |
| 7 | Paul Blanchfield | President | 108,214 | 0 | 108,214 | 1.3% | 15 Aug, 2025 |
| 8 | Etienne Montagut | Chief Business Officer | 94,651 | 0 | 94,651 | 1.1% | 07 Mar, 2024 |
| 9 | Sam R Leno | Director | 67,246 | 0 | 67,246 | 0.8% | 18 May, 2026 |
| 10 | Carol Walker | Senior Vice President, Quality | 64,899 | 0 | 64,899 | 0.8% | 01 Apr, 2022 |
| 11 | Amanda Michelle Morgan | Chief Commercial Officer | 64,153 | 0 | 64,153 | 0.8% | 09 Mar, 2026 |
| 12 | Andrea Sabens | Chief Accounting Officer | 60,420 | 0 | 60,420 | 0.7% | 17 Jul, 2024 |
| 13 | James H Thrall | Director | 39,881 | 0 | 39,881 | 0.5% | 18 May, 2026 |
| 14 | Jean-Claude Provost | Chief Medical Officer | 0 | 38,841 | 38,841 | 0.5% | 07 Mar, 2024 |
| 15 | Ludger Dinkelborg | Officer | 33,195 | 0 | 33,195 | 0.4% | 19 Aug, 2026 |
| 16 | Ying Vivian Yao | Chief Human Resources Officer | 30,319 | 0 | 30,319 | 0.4% | 07 Mar, 2022 |
| 17 | Julie Mchugh | Director | 30,099 | 0 | 30,099 | 0.4% | 18 May, 2026 |
| 18 | Heinz Christoph Maeusli | Director | 30,014 | 0 | 30,014 | 0.4% | 18 May, 2026 |
| 19 | Gerard Ber | Director | 27,118 | 0 | 27,118 | 0.3% | 03 Jun, 2026 |
| 20 | Minnie Baylor-Henry | Director | 14,018 | 0 | 14,018 | 0.2% | 18 May, 2026 |
| 21 | Kimberly Brown | Chief Accounting Officer | 13,263 | 0 | 13,263 | 0.2% | 19 Aug, 2026 |
| 22 | Jeffrey Humphrey | Chief Medical Officer | 9,076 | 0 | 9,076 | 0.1% | 20 Jun, 2024 |
| 23 | Julia Marie Eastland | Director | 8,019 | 0 | 8,019 | 0.1% | 18 May, 2026 |
| 24 | Phuong Khanh Morrow | Director | 7,237 | 0 | 7,237 | 0.1% | 18 May, 2026 |
| 25 | Gary J Pruden | Director | 6,674 | 0 | 6,674 | 0.1% | 18 May, 2026 |
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 |
|---|---|---|---|---|---|---|---|---|
| 31 Aug, 2026 | Robert J. Jr. Marshall | Cfo And Treasurer | Disposed F | 721 | $100.96 | $72.79K | 122,071 | Direct |
| 17 Aug, 2026 | Kimberly Brown | Chief Accounting Officer | Disposed F | 463 | $100.91 | $46.72K | 13,263 | Direct |
| 17 Aug, 2026 | Ludger Dinkelborg | Officer | Disposed F | 2,536 | $100.91 | $255.91K | 33,195 | Direct |
| 14 May, 2026 | Gerard Ber | Director | Disposed F | 381 | $96.67 | $36.83K | 27,118 | Direct |
| 14 May, 2026 | Mary Anne Heino | Executive Chair And Ceo | Disposed F | 1,227 | $96.67 | $118.61K | 321,897 | Direct |
| 14 May, 2026 | James H Thrall | Director | Acquired A | 4,137 | $0.00 | $0 | 39,881 | Direct |
| 14 May, 2026 | Sam R Leno | Director | Acquired A | 4,137 | $0.00 | $0 | 67,246 | Direct |
| 14 May, 2026 | Julie Mchugh | Director | Acquired A | 4,137 | $0.00 | $0 | 30,099 | Direct |
| 14 May, 2026 | Heinz Christoph Maeusli | Director | Acquired A | 4,137 | $0.00 | $0 | 30,014 | Direct |
| 14 May, 2026 | Phuong Khanh Morrow | Director | Acquired A | 4,137 | $0.00 | $0 | 7,237 | Direct |
| 14 May, 2026 | Gerard Ber | Director | Acquired A | 4,137 | $0.00 | $0 | 27,499 | Direct |
| 14 May, 2026 | Julia Marie Eastland | Director | Acquired A | 4,137 | $0.00 | $0 | 8,019 | Direct |
| 14 May, 2026 | Minnie Baylor-Henry | Director | Acquired A | 4,137 | $0.00 | $0 | 14,018 | Direct |
| 14 May, 2026 | Gary J Pruden | Director | Acquired A | 4,137 | $0.00 | $0 | 6,674 | Direct |
| 17 Apr, 2026 | Daniel Niedzwiecki | Officer | Disposed F | 1,911 | $83.82 | $160.18K | 117,465 | Direct |
| 05 Mar, 2026 | Amanda Michelle Morgan | Chief Commercial Officer | Acquired A | 26,208 | $0.00 | $0 | 64,748 | Direct |
| 05 Mar, 2026 | Robert J. Jr. Marshall | Cfo And Treasurer | Acquired A | 38,002 | $0.00 | $0 | 123,974 | Direct |
| 05 Mar, 2026 | Daniel Niedzwiecki | Officer | Acquired A | 36,692 | $0.00 | $0 | 120,659 | Direct |
| 05 Mar, 2026 | Kimberly Brown | Chief Accounting Officer | Acquired A | 6,158 | $0.00 | $0 | 13,859 | Direct |
| 05 Mar, 2026 | Ludger Dinkelborg | Officer | Acquired A | 20,966 | $0.00 | $0 | 35,731 | Direct |