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 | 12.53 | 8,183,193 | -1.0 | 03/31/2026 |
| Farallon Capital Management, L.L.C. | 8.55 | 5,583,479 | +2.9 | 03/31/2026 |
| HHG PLC | 7.31 | 4,774,841 | -16.3 | 03/31/2026 |
| FMR Inc | 7.09 | 4,626,453 | +7.0 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 4.86 | 3,174,274 | +0.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.46 | 2,914,314 | +0.0 | 03/31/2026 |
| American Century Companies Inc | 4.31 | 2,816,547 | +58.1 | 06/30/2026 |
| State Street Corp | 3.72 | 2,429,803 | +0.1 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Avantis US Small Cap Value ETF | 4.39 | 2,863,560 | +0.0 | 08/31/2026 |
| iShares Core S&P Mid-Cap ETF | 3.49 | 2,280,346 | +0.0 | 08/31/2026 |
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 | 1,165,593,240 $ | Sep 1, 2026 | direct |
| Lantheus Alpha Therapy, LLC | 10% Owner | 11,273,364 | 1,136,355,091 $ | Sep 4, 2026 | direct |
| Marshall Robert J. Jr. | CFO and Treasurer | 122,071 | 12,304,757 $ | Aug 31, 2026 | direct |
| Dinkelborg Ludger | See Remarks | 33,195 | 3,346,056 $ | Aug 17, 2026 | direct |
| Brown Kimberly | Chief Accounting Officer | 13,263 | 1,336,910 $ | 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: September 17, 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.