LANTHEUS HLDGS INC LNTH
COM · Common Stock · CUSIP 516544103 · ISIN US5165441032
Radiopharmaceuticals company
- SectorHealth care
- IndustryIn Vitro & In Vivo Diagnostic Substances
- HeadquartersBedford, MA
- Websitelantheus.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($9.8m this quarter). Holder counts are more reliable. Shares outstanding: 65.3m as of 2026-08-03, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $110.86. Options: 11 managers hold calls ($44.1m notional), 7 hold puts ($25.7m).
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 353 |
| Q4 2022 | 367 |
| Q1 2023 | 389 |
| Q2 2023 | 433 |
| Q3 2023 | 401 |
| Q4 2023 | 403 |
| Q1 2024 | 409 |
| Q2 2024 | 453 |
| Q3 2024 | 501 |
| Q4 2024 | 488 |
| Q1 2025 | 526 |
| Q2 2025 | 477 |
| Q3 2025 | 419 |
| Q4 2025 | 392 |
| Q1 2026 | 407 |
| Q2 2026 | 466 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2024 | 262 | 235 |
| Q4 2024 | 241 | 245 |
| Q1 2025 | 278 | 221 |
| Q2 2025 | 239 | 264 |
| Q3 2025 | 179 | 313 |
| Q4 2025 | 169 | 252 |
| Q1 2026 | 205 | 179 |
| Q2 2026 | 241 | 173 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $25.2m | $20.3m | 0.81 |
| Q4 2025 | $23.5m | $14.5m | 0.62 |
| Q1 2026 | $31.1m | $21.4m | 0.69 |
| Q2 2026 | $44.1m | $25.7m | 0.58 |
Biggest buyers
| Assenagon Asset Management S.A. | Added | +1.3m |
| CITADEL ADVISORS LLC | Added | +1.1m |
| AMERICAN CENTURY COMPANIES INC | Added | +1.0m |
| PRICE T ROWE ASSOCIATES INC /MD/ | Added | +983.6k |
| Holocene Advisors, LP | New | +547.0k |
| AMERIPRISE FINANCIAL INC | Added | +349.4k |
| GOLDMAN SACHS GROUP INC | Added | +258.5k |
| WELLINGTON MANAGEMENT GROUP LLP | Added | +244.2k |
| BROWN ADVISORY INC | Added | +228.1k |
| BlackRock, Inc. | Added | +214.4k |
Biggest sellers
| FMR LLC | Reduced | -746.5k |
| MACKENZIE FINANCIAL CORP | Sold out | -714.6k |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | Sold out | -598.9k |
| TD Asset Management Inc | Reduced | -479.8k |
| Longaeva Partners L.P. | Reduced | -354.9k |
| Point72 Asset Management, L.P. | Reduced | -344.4k |
| Alyeska Investment Group, L.P. | Sold out | -305.5k |
| Epoch Investment Partners, Inc. | Reduced | -262.8k |
| Balyasny Asset Management L.P. | Reduced | -261.6k |
| BANK OF AMERICA CORP /DE/ | Reduced | -201.4k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $25.5m229.8k shares |
| CITADEL ADVISORS LLC | Added | $6.6m59.1k shares |
| IMC-Chicago, LLC | Reduced | $6.2m56.1k shares |
| JANE STREET GROUP, LLC | Added | $3.3m29.6k shares |
| SIMPLEX TRADING, LLC | Added | $909.7k8.2k shares |
| Point72 Asset Management, L.P. | Reduced | $554.7k5.0k shares |
| DRW Securities, LLC | New | $355.0k3.2k shares |
| GROUP ONE TRADING LLC | Added | $244.1k2.2k shares |
| Twin Tree Management, LP | New | $221.9k2.0k shares |
| Walleye Capital LLC | New | $133.1k1.2k shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $12.3m111.2k shares |
| JANE STREET GROUP, LLC | Reduced | $5.1m46.1k shares |
| CITADEL ADVISORS LLC | Reduced | $4.2m38.1k shares |
| IMC-Chicago, LLC | Reduced | $1.9m17.4k shares |
| GROUP ONE TRADING LLC | Unchanged | $1.6m14.3k shares |
| SIMPLEX TRADING, LLC | Added | $465.9k4.2k shares |
| Point72 Asset Management, L.P. | New | $44.4k400 shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| JANUS HENDERSON GROUP PLC 13G · institution -1.2 pts · filed 2026-05-15 | 7.4% |
| FMR LLC 13G · institution -1.0 pts · filed 2025-11-05 | 6.5% |
| VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-30 | 5.2% |
| VANGUARD PORTFOLIO MANAGEMENT LLC 13G · institution new · filed 2026-07-31 | 5.1% |
Fell to 5% or below in the last year: VANGUARD GROUP INC (0.0%, 2026-03-27; now reported by VANGUARD CAPITAL MANAGEMENT LLC), MORGAN STANLEY (2.5%, 2026-02-12)
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 3 | $2.0m | $2.0m |
| Q1 2025 | 0 | — | 4 | $6.3m | $6.3m |
| Q2 2025 | 0 | — | 5 | $7.2m | $7.2m |
| Q3 2025 | 0 | — | 1 | $163.9k | $163.9k |
| Q4 2025 | 0 | — | 0 | — | — |
| Q1 2026 | 0 | — | 0 | — | — |
| Q2 2026 | 0 | — | 0 | — | — |
| Q3 2026 | 0 | — | 0 | — | — |
None reported since 1 Apr 2026.
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| BlackRock, Inc. 0.01% of their portfolio | 8.4m $931.6m | Added +214.4k |
| FARALLON CAPITAL MANAGEMENT, L.L.C. 3.63% of their portfolio | 5.6m $619.4m | Unchanged |
| Jupiter Topco LLC 0.23% of their portfolio | 5.2m $575.6m | First filing |
| FMR LLC 0.02% of their portfolio | 3.9m $430.4m | Reduced -746.5k |
| VANGUARD PORTFOLIO MANAGEMENT LLC 0.02% of their portfolio | 3.2m $359.3m | Added +64.2k |
| VANGUARD CAPITAL MANAGEMENT LLC 0.01% of their portfolio | 2.9m $325.3m | Added +17.9k |
| AMERICAN CENTURY COMPANIES INC 0.14% of their portfolio | 2.8m $312.5m | Added +1.0m |
| STATE STREET CORP 0.01% of their portfolio | 2.5m $277.4m | Added +70.9k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.02% of their portfolio | 1.9m $211.2m | Added +983.6k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 1.8m $204.3m | Added +75.4k |
| MORGAN STANLEY 0.01% of their portfolio | 1.7m $191.5m | Added +79.8k |
| REINHART PARTNERS, LLC. 4.05% of their portfolio | 1.6m $177.4m | Added +34.5k |
| DIMENSIONAL FUND ADVISORS LP 0.03% of their portfolio | 1.5m $162.7m | Added +86.7k |
| Assenagon Asset Management S.A. 0.10% of their portfolio | 1.4m $158.6m | Added +1.3m |
| CITADEL ADVISORS LLC 0.09% of their portfolio | 1.4m $152.7m | Added +1.1m |
| Carmignac Gestion 1.93% of their portfolio | 1.3m $148.7m | Added +12.1k |
| Swedbank AB 0.11% of their portfolio | 1.2m $133.3m | Reduced -27.5k |
| WELLINGTON MANAGEMENT GROUP LLP 0.02% of their portfolio | 1.0m $112.4m | Added +244.2k |
| BROWN ADVISORY INC 0.16% of their portfolio | 915.7k $101.6m | Added +228.1k |
| UBS Group AG 0.01% of their portfolio | 835.5k $92.7m | Reduced -32.2k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 818.4k $90.8m | Added +13.5k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 814.1k $90.3m | Added +258.5k |
| MARSHALL WACE, LLP 0.07% of their portfolio | 774.0k $85.9m | Added +162.2k |
| DEERFIELD MANAGEMENT COMPANY, L.P. 0.87% of their portfolio | 753.0k $83.5m | Reduced -75.0k |
| JACOBS LEVY EQUITY MANAGEMENT, INC 0.28% of their portfolio | 699.6k $77.6m | Added +121.9k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 699.2k $77.0m | Reduced -40.2k |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. 0.11% of their portfolio | 671.0k $74.4m | Reduced -169.4k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 665.5k $73.8m | Added +8.0k |
| TD Asset Management Inc 0.06% of their portfolio | 653.7k $72.5m | Reduced -479.8k |
| Point72 Asset Management, L.P. 0.11% of their portfolio | 629.8k $69.9m | Reduced -344.4k |
| AMERIPRISE FINANCIAL INC 0.01% of their portfolio | 619.3k $68.7m | Added +349.4k |
| NORGES BANK 0.01% of their portfolio | 586.8k $65.1m | Not comparable |
| Holocene Advisors, LP 0.14% of their portfolio | 547.0k $60.7m | New |
| Boston Partners 0.05% of their portfolio | 500.6k $55.1m | Added +30.0k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio | 482.7k $53.6m | Reduced -3.8k |
| VICTORY CAPITAL MANAGEMENT INC 0.03% of their portfolio | 470.1k $52.1m | Added +200.6k |
| VANGUARD FIDUCIARY TRUST CO 0.01% of their portfolio | 466.1k $51.7m | Added +7.1k |
| Bank of New York Mellon Corp 0.01% of their portfolio | 441.8k $49.0m | Reduced -21.9k |
| Polaris Capital Management, LLC 4.44% of their portfolio | 424.5k $47.1m | Reduced -192.5k |
| Summit Street Capital Management, LLC 6.24% of their portfolio | 400.7k $44.5m | Reduced -14.8k |
| Epoch Investment Partners, Inc. 0.24% of their portfolio | 387.0k $42.9m | Reduced -262.8k |
| VOYA INVESTMENT MANAGEMENT LLC 0.04% of their portfolio | 370.6k $41.1m | Added +33.6k |
| Private Capital Management, LLC 3.60% of their portfolio | 358.2k $39.7m | Added +580 |
| MILLENNIUM MANAGEMENT LLC 0.03% of their portfolio | 336.4k $37.3m | Added +81.2k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 330.3k $36.6m | Reduced -201.4k |
| BRIGADE CAPITAL MANAGEMENT, LP 23.86% of their portfolio | 328.7k $36.5m | Reduced -35.0k |
| BNP PARIBAS FINANCIAL MARKETS 0.02% of their portfolio | 301.0k $33.4m | Added +1.3k |
| Portolan Capital Management, LLC 1.20% of their portfolio | 288.7k $32.0m | Reduced -128.7k |
| Balyasny Asset Management L.P. 0.06% of their portfolio | 277.8k $30.8m | Reduced -261.6k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.20% of their portfolio | 270.7k $30.0m | Reduced -22.1k |
| AQR CAPITAL MANAGEMENT LLC 0.01% of their portfolio | 261.2k $28.6m | Added +145.7k |
| DEUTSCHE BANK AG\ 0.01% of their portfolio | 248.7k $27.6m | Added +11.9k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.04% of their portfolio | 246.8k $27.4m | Reduced -100.0k |
| PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio | 235.8k $26.2m | Added +10.1k |
| RAYMOND JAMES FINANCIAL INC 0.01% of their portfolio | 234.8k $26.0m | Added +141.7k |
| Invesco Ltd. 0.00% of their portfolio | 234.7k $26.0m | Reduced -127.8k |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC 0.08% of their portfolio | 232.6k $25.8m | Reduced -167.0k |
| RHUMBLINE ADVISERS 0.02% of their portfolio | 197.1k $21.9m | Added +2.5k |
| Integral Health Asset Management, LLC 0.86% of their portfolio | 190.0k $21.1m | Added +65.0k |
| CITIGROUP INC 0.01% of their portfolio | 189.7k $21.0m | Added +29.5k |
| Sarissa Capital Management LP 10.41% of their portfolio | 166.9k $18.5m | Unchanged |
| Nuveen, LLC 0.00% of their portfolio | 162.2k $18.0m | Added +15.6k |
| Retirement Systems of Alabama 0.05% of their portfolio | 160.0k $17.8m | Reduced -14.0k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 156.5k $17.4m | Added +39.1k |
| Penn Capital Management Company, LLC 1.08% of their portfolio | 153.9k $17.1m | New |
| ExodusPoint Capital Management, LP 0.15% of their portfolio | 150.0k $16.6m | Reduced -66.3k |
| Russell Investments Group, Ltd. 0.01% of their portfolio | 147.1k $16.3m | Added +15.6k |
| PFM Health Sciences, LP 1.41% of their portfolio | 146.4k $16.2m | New |
| LOOMIS SAYLES & CO L P 0.02% of their portfolio | 141.4k $15.7m | Added +1.6k |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC 0.05% of their portfolio | 139.2k $15.4m | Reduced -47.0k |
| THOMPSON SIEGEL & WALMSLEY LLC 0.28% of their portfolio | 138.7k $15.4m | Reduced -38.2k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 133.9k $10.2m | Reduced -373 |
| Defilade Capital Management, L.P. 1.97% of their portfolio | 132.7k $14.7m | Reduced -116.7k |
| Swiss National Bank 0.01% of their portfolio | 130.7k $14.5m | Reduced -500 |
| California Public Employees Retirement System 0.01% of their portfolio | 130.4k $14.5m | Reduced -1.4k |
| Cambridge Investment Research Advisors, Inc. 0.02% of their portfolio | 128.4k $14.2m | Added +58.5k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.02% of their portfolio | 127.3k $14.1m | Added +106.8k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.03% of their portfolio | 116.0k $12.9m | Reduced -10.5k |
| FIL Ltd 0.01% of their portfolio | 114.3k $12.7m | Reduced -102.4k |
| SEI INVESTMENTS CO 0.01% of their portfolio | 98.3k $10.9m | Added +13.0k |
| Legal & General Group Plc 0.00% of their portfolio | 88.2k $9.8m | Reduced -6.8k |
| Creative Planning 0.01% of their portfolio | 85.6k $9.5m | Added +5.3k |
| Amundi 0.00% of their portfolio | 82.1k $9.1m | Added +3.6k |
| FIRST TRUST ADVISORS LP 0.01% of their portfolio | 77.5k $8.6m | Added +17.2k |
| LSV ASSET MANAGEMENT 0.02% of their portfolio | 76.4k $8.5m | Unchanged |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 76.0k $8.4m | Reduced -2.2k |
| MetLife Investment Management, LLC 0.03% of their portfolio | 68.3k $7.6m | Added +1.2k |
| Stanley-Laman Group, Ltd. 0.77% of their portfolio | 68.0k $7.5m | Reduced -17.5k |
| Focus Partners Wealth 0.01% of their portfolio | 67.8k $7.5m | Reduced -4.7k |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 66.3k $7.4m | Reduced -5.4k |
| Bridgewater Associates, LP 0.03% of their portfolio | 65.9k $7.3m | Added +22.2k |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 65.8k $7.3m | Added +5.5k |
| 1492 Capital Management LLC 2.14% of their portfolio | 65.4k $7.3m | Added +38.0k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.01% of their portfolio | 61.7k $6.8m | Reduced -7.5k |
| VANGUARD ASSET MANAGEMENT, Ltd 0.00% of their portfolio | 61.3k $6.8m | Added +234 |
| DANSKE BANK A/S 0.01% of their portfolio | 60.8k $6.7m | New |
| Man Group plc 0.01% of their portfolio | 54.8k $6.1m | Reduced -3.3k |
| Lido Advisors, LLC 0.02% of their portfolio | 49.2k $5.5m | Reduced -7.7k |
| Universal- Beteiligungs- und Servicegesellschaft mbH 0.01% of their portfolio | 48.5k $5.4m | Reduced -10.2k |
| MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC 0.05% of their portfolio | 46.9k $5.2m | Reduced -3.1k |