Lantheus Holdings Inc
Ownership
Ownership Structure
Who owns Lantheus Holdings Inc (LNTH)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 89.8% of the shares are freely tradable; institutional investors hold 115.5%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 12.86 | 8,397,642 | +2.6 | 06/30/2026 |
| Farallon Capital Management, L.L.C. | 8.55 | 5,583,479 | +0.0 | 06/30/2026 |
| Jupiter Topco LLC | 7.95 | 5,188,416 | +0.0 | 06/30/2026 |
| HHG PLC | 7.31 | 4,774,841 | -16.3 | 03/31/2026 |
| FMR Inc | 5.94 | 3,879,971 | -16.1 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 4.96 | 3,238,471 | +2.0 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.49 | 2,932,214 | +0.6 | 06/30/2026 |
| American Century Companies Inc | 4.31 | 2,816,547 | +58.1 | 06/30/2026 |
| State Street Corp | 3.83 | 2,500,696 | +2.9 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Avantis US Small Cap Value ETF | 3.97 | 2,593,343 | +0.0 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Lantheus Holdings, Inc. | 10% Owner | 11,563,425 | 1,159,811,528 $ | Sep 1, 2026 | direct |
| Lantheus Alpha Therapy, LLC | 10% Owner | 11,273,364 | 1,130,718,409 $ | Sep 4, 2026 | direct |
| Marshall Robert J. Jr. | CFO and Treasurer | 122,071 | 12,243,721 $ | Aug 31, 2026 | direct |
| Dinkelborg Ludger | See Remarks | 33,195 | 3,329,459 $ | Aug 17, 2026 | direct |
| Brown Kimberly | Chief Accounting Officer | 13,263 | 1,330,279 $ | Aug 17, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 4, 2026 | Lantheus Alpha Therapy, LLC | 10% Owner | Sell | 167,149 | 3.15 | 526,051 |
| Sep 3, 2026 | Lantheus Alpha Therapy, LLC | 10% Owner | Sell | 80,783 | 3.11 | 250,896 |
| Sep 2, 2026 | Lantheus Alpha Therapy, LLC | 10% Owner | Sell | 42,129 | 3.11 | 131,219 |
| Sep 1, 2026 | Lantheus Holdings, Inc. | 10% Owner | Sell | 35,769 | 3.12 | 111,574 |
| Aug 31, 2026 | Lantheus Holdings, Inc. | 10% Owner | Sell | 78,145 | 3.14 | 245,610 |
| Aug 31, 2026 | Marshall Robert J. Jr. | CFO and Treasurer | Other | 721 | 100.96 | 72,792 |
| Aug 17, 2026 | Dinkelborg Ludger | See Remarks | Other | 2,536 | 100.91 | 255,908 |
| Aug 17, 2026 | Brown Kimberly | Chief Accounting Officer | Other | 463 | 100.91 | 46,721 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: November 2, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.