Lantheus Holdings, Inc. (LNTH) shareholders
LNTHNasdaqIn Vitro & In Vivo Diagnostic SubstancesFiscal year ends December 31
Financials through Q3 FY2026, quarter ended Sep 30, 2026Last filing: 10-Q on Nov 5, 2026Score 12/3010% above fair value
$101.59+0.34 (+0.34%)
Close on Nov 13, 2026Market cap $6.63BP/E 25.1Yield –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
100.0%
76M of 65M shares
Institutional holders
467
97 new, 31 sold out
Net institutional buying
7M
In Q2 2026
Insider trades, 12 months
0 buys · 0 sales
Open-market trades only
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| BlackRock, Inc. | 8,600,964 | – | 13G (passive) amendment | Dec 31, 2023 |
| Patel, Rajiv A. Joint filing with Wehrly, Mark C. (8.80%), Short Daniel S. (8.80%) and 17 more | 6,023,227 | 8.80% | 13G (passive) amendment | Mar 31, 2025 |
| Giauque, Nicolas Joint filing with Farallon Capital Management, L.L.C. (8.60%), Dapice Joshua J. (8.60%) and 13 more | 5,583,479 | 8.60% | 13G (passive) amendment | Jun 30, 2026 |
| Warren, John R. Joint filing with Wehrly, Mark C. (8.20%), Dapice Joshua J. (8.20%) and 13 more | 5,427,479 | 8.20% | 13G (passive) amendment | Dec 31, 2025 |
| Janus Henderson Group PLC | 4,774,841 | 7.40% | 13G (passive) amendment | Mar 31, 2026 |
| FMR LLC Joint filing with Abigail P. Johnson (6.50%) | 4,399,524 | 6.50% | 13G (passive) amendment | Sep 30, 2025 |
| Dunn Hannah E. Joint filing with Wehrly, Mark C. (5.10%), Dapice Joshua J. (5.10%) and 15 more | 3,477,227 | 5.10% | 13G (passive) amendment | Sep 30, 2025 |
| Vanguard Capital Management | 3,421,414 | 5.25% | 13G (passive) | Mar 31, 2026 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of LNTH | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| BlackRock, Inc. | 8,397,642 | 12.87% | $931.63M | +214,449 | 0.01% |
| Farallon Capital Management LLC | 5,583,479 | 8.55% | $619.43M | – | 2.86% |
| Jupiter Topco LLC | 5,188,416 | 7.95% | $575.63M | New | 0.23% |
| FMR LLC | 3,879,971 | 5.94% | $430.44M | −746,482 | 0.02% |
| Vanguard Portfolio Management LLC | 3,238,471 | 4.96% | $359.28M | +64,197 | 0.02% |
| Vanguard Capital Management LLC | 2,932,214 | 4.49% | $325.30M | +17,900 | 0.01% |
| American Century Companies Inc | 2,816,547 | 4.32% | $312.47M | +1,035,441 | 0.14% |
| State Street Corp | 2,500,696 | 3.83% | $277.43M | +70,893 | 0.01% |
| Price T Rowe Associates Inc /Md/ | 1,903,354 | 2.92% | $211.16M | +983,622 | 0.02% |
| Geode Capital Management, LLC | 1,841,367 | 2.82% | $204.32M | +75,415 | 0.01% |
| Morgan Stanley | 1,726,303 | 2.64% | $191.52M | +79,840 | 0.01% |
| Reinhart Partners, LLC. | 1,599,379 | 2.45% | $177.44M | +34,501 | 4.05% |
| Dimensional Fund Advisors LP | 1,466,260 | 2.25% | $162.66M | +86,690 | 0.03% |
| Assenagon Asset Management S.A. | 1,429,960 | 2.19% | $158.64M | +1,297,641 | 0.10% |
| Citadel Advisors LLC | 1,376,480 | 2.11% | $152.71M | +1,091,936 | 0.02% |
| Carmignac Gestion | 1,340,100 | 2.05% | $148.67M | +12,100 | 1.93% |
| Swedbank AB | 1,201,243 | 1.84% | $133.27M | −27,500 | 0.11% |
| Wellington Management Group Llp | 1,013,063 | 1.55% | $112.39M | +244,213 | 0.02% |
| Brown Advisory Inc | 915,683 | 1.40% | $101.59M | +228,076 | 0.16% |
| UBS Group AG | 835,494 | 1.28% | $92.69M | −32,181 | 0.01% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 467 | 76M | 100.0% | 97 / 153 | 143 / 31 | 15M | 8M |
| Q1 2026 | 408 | 74M | 100.0% | 70 / 144 | 132 / 48 | 18M | 7M |
| Q4 2025 | 393 | 70M | 100.0% | 73 / 111 | 157 / 94 | 11M | 15M |
| Q3 2025 | 419 | 73M | 100.0% | 76 / 106 | 187 / 128 | 12M | 20M |
| Q2 2025 | 476 | 82M | 100.0% | 46 / 197 | 176 / 90 | 11M | 8M |
| Q1 2025 | 525 | 79M | 100.0% | 89 / 199 | 177 / 44 | 10M | 5M |
| Q4 2024 | 487 | 75M | 100.0% | 74 / 189 | 170 / 76 | 13M | 8M |
| Q3 2024 | 500 | 71M | 100.0% | 105 / 163 | 181 / 55 | 18M | 7M |
| Q2 2024 | 454 | 69M | 100.0% | 77 / 145 | 179 / 83 | 6M | 258M |
| Q1 2024 | 463 | 321M | 100.0% | 103 / 187 | 122 / 62 | 234M | 20M |
| Q4 2023 | 426 | 107M | 100.0% | 81 / 139 | 152 / 66 | 12M | 12M |
| Q3 2023 | 418 | 107M | 100.0% | 56 / 145 | 161 / 86 | 18M | 12M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
455 funds held LNTH in Q2 2026, 41% of their shares through ETFs. Each fund counts once per quarter, from its quarter-end report.
| Fund | Shares | % of LNTH | Value | % of fund | As of |
|---|---|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 2,228,445 | 3.41% | $247.22M | 0.20% | Jun 30, 2026 |
| Vanguard Total Stock Market Index Fund | 2,065,879 | 3.17% | $229.19M | 0.01% | Jun 30, 2026 |
| Avantis U.S. Small Cap Value ETF | 1,918,552 | 2.94% | $190.51M | 0.70% | May 31, 2026 |
| iShares Russell 2000 ETF | 1,677,046 | 2.57% | $186.05M | 0.22% | Jun 30, 2026 |
| Vanguard Small-Cap Index Fund | 1,493,665 | 2.29% | $165.71M | 0.09% | Jun 30, 2026 |
| Janus Henderson Enterprise Fund | 1,132,936 | 1.74% | $125.69M | 0.56% | Jun 30, 2026 |
| Janus Henderson Triton Fund | 912,296 | 1.40% | $101.21M | 1.71% | Jun 30, 2026 |
| Vanguard Small-Cap Growth Index Fund | 860,764 | 1.32% | $95.49M | 0.20% | Jun 30, 2026 |
| Strategic Advisers Fidelity U.S. Total Stock Fund | 842,168 | 1.29% | $83.63M | 0.03% | May 31, 2026 |
| Vanguard Extended Market Index Fund | 746,593 | 1.14% | $82.83M | 0.08% | Jun 30, 2026 |
| Fidelity Small Cap Index Fund | 714,017 | 1.09% | $71.14M | 0.21% | Jul 31, 2026 |
| T. Rowe Price Integrated U.S. Small-Cap Growth Equity Fund | 664,068 | 1.02% | $73.67M | 0.75% | Jun 30, 2026 |
| iShares Russell 2000 Growth ETF | 603,132 | 0.92% | $66.91M | 0.43% | Jun 30, 2026 |
| Nomura Small Cap Core Fund | 534,237 | 0.82% | $53.05M | 0.96% | May 29, 2026 |
| Janus Henderson Global Life Sciences Fund | 508,445 | 0.78% | $56.41M | 0.97% | Jun 30, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Mary Anne Heino | Executive Chair and CEO, Director | 587,968 | 0.90% | Jun 3, 2026 |
| Brian A. Markison | CEO, Director | 232,420 | 0.36% | Mar 7, 2025 |
| Robert J. Marshall Jr. | CFO and Treasurer | 122,071 | 0.19% | Sep 2, 2026 |
| Ludger Dinkelborg | See Remarks | 33,195 | 0.05% | Aug 19, 2026 |
| Kimberly Brown | Chief Accounting Officer | 13,263 | 0.02% | Aug 19, 2026 |
| Daniel Niedzwiecki | See Remarks | 117,465 | 0.18% | Apr 21, 2026 |
| Amanda Michelle Morgan | Chief Commercial Officer | 64,748 | 0.10% | Mar 9, 2026 |
| Paul Blanchfield | President | 108,214 | 0.17% | Aug 15, 2025 |
| Gerard Ber | Director | 27,118 | 0.04% | Jun 3, 2026 |
| James H. Thrall | Director | 39,881 | 0.06% | May 18, 2026 |
| Sam R. Leno | Director | 67,246 | 0.10% | May 18, 2026 |
| Julie McHugh | Director | 30,099 | 0.05% | May 18, 2026 |
| Gary J. Pruden | Director | 29,736 | 0.05% | May 18, 2026 |
| Minnie Baylor-Henry | Director | 14,034 | 0.02% | May 18, 2026 |
| Heinz Christoph Maeusli | Director | 30,014 | 0.05% | May 18, 2026 |
| Julia Marie Eastland | Director | 8,019 | 0.01% | May 18, 2026 |
| Phuong Khanh Morrow | Director | 7,237 | 0.01% | May 18, 2026 |
| Andrew J. M. Spokes | – | 6,883,227 | 10.55% | Aug 21, 2025 |
| Philip D. Dreyfuss | – | – | – | Aug 21, 2025 |
| Mark C. Wehrly | – | 3,477,227 | 5.33% | Aug 21, 2025 |
| Partners L. L. C/Ca Farallon | 10% owner | – | – | Aug 21, 2025 |
| Nicolas Giauque | – | – | – | Aug 21, 2025 |
| Patrick (Cheng) Luo | – | – | – | Aug 21, 2025 |
| Rajiv A. Patel | – | – | – | Aug 21, 2025 |
| Hannah E. Dunn | – | 6,883,227 | 10.55% | Aug 21, 2025 |
| Richard B. Fried | – | – | – | Aug 21, 2025 |
| Daniel S. Short | – | – | – | Aug 21, 2025 |
| William Seybold | – | – | – | Aug 21, 2025 |
| Edric C. Saito | – | – | – | Aug 21, 2025 |
| John R. Warren | – | – | – | Aug 21, 2025 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Robert J. Marshall Jr. CFO and Treasurer | Aug 31, 2026 | Tax withholding | −721 | $100.96 | $72.79K | 122,071 |
| Kimberly Brown Chief Accounting Officer | Aug 17, 2026 | Tax withholding | −463 | $100.91 | $46.72K | 13,263 |
| Ludger Dinkelborg See Remarks | Aug 17, 2026 | Tax withholding | −2,536 | $100.91 | $255.91K | 33,195 |
| Gerard Ber Director | May 14, 2026 | Tax withholding | −381 | $96.67 | $36.83K | 27,118 |
| Mary Anne Heino Executive Chair and CEO, Director | May 14, 2026 | Tax withholding | −1,227 | $96.67 | $118.61K | 321,897 |
| Sam R. Leno Director | May 14, 2026 | Award | +4,137 | – | – | 67,246 |
| Julie McHugh Director | May 14, 2026 | Award | +4,137 | – | – | 30,099 |
| Gerard Ber Director | May 14, 2026 | Award | +4,137 | – | – | 27,499 |
| Gary J. Pruden Director | May 14, 2026 | Award | +4,137 | – | – | 6,674 |
| Phuong Khanh Morrow Director | May 14, 2026 | Award | +4,137 | – | – | 7,237 |
| Minnie Baylor-Henry Director | May 14, 2026 | Award | +4,137 | – | – | 14,018 |
| Heinz Christoph Maeusli Director | May 14, 2026 | Award | +4,137 | – | – | 30,014 |
| James H. Thrall Director | May 14, 2026 | Award | +4,137 | – | – | 39,881 |
| Julia Marie Eastland Director | May 14, 2026 | Award | +4,137 | – | – | 8,019 |
| Daniel Niedzwiecki See Remarks | Apr 17, 2026 | Tax withholding | −1,911 | $83.82 | $160.18K | 117,465 |
| Daniel Niedzwiecki See Remarks | Mar 5, 2026 | Tax withholding | −1,283 | $76.31 | $97.91K | 119,376 |
| Daniel Niedzwiecki See Remarks | Mar 5, 2026 | Award | +36,692 | – | – | 120,659 |
| Robert J. Marshall Jr. CFO and Treasurer | Mar 5, 2026 | Tax withholding | −1,182 | $76.31 | $90.20K | 122,792 |
| Robert J. Marshall Jr. CFO and Treasurer | Mar 5, 2026 | Award | +38,002 | – | – | 123,974 |
| Ludger Dinkelborg See Remarks | Mar 5, 2026 | Award | +20,966 | – | – | 35,731 |
| Amanda Michelle Morgan Chief Commercial Officer | Mar 5, 2026 | Award | +26,208 | – | – | 64,748 |
| Amanda Michelle Morgan Chief Commercial Officer | Mar 5, 2026 | Tax withholding | −595 | $76.31 | $45.40K | 64,153 |
| Kimberly Brown Chief Accounting Officer | Mar 5, 2026 | Award | +6,158 | – | – | 13,859 |
| Kimberly Brown Chief Accounting Officer | Mar 5, 2026 | Tax withholding | −133 | $76.31 | $10.15K | 13,726 |
| Robert J. Marshall Jr. CFO and Treasurer | Mar 2, 2026 | Tax withholding | −10,652 | $76.30 | $812.75K | 85,972 |
| Robert J. Marshall Jr. CFO and Treasurer | Mar 2, 2026 | Award | +8,491 | – | – | 96,624 |
| Daniel Niedzwiecki See Remarks | Mar 2, 2026 | Tax withholding | −8,259 | $76.30 | $630.16K | 83,967 |
| Daniel Niedzwiecki See Remarks | Mar 2, 2026 | Award | +5,169 | – | – | 92,226 |
| Mary Anne Heino Executive Chair and CEO, Director | Mar 2, 2026 | Award | +32,105 | – | – | 365,040 |
| Mary Anne Heino Executive Chair and CEO, Director | Mar 2, 2026 | Tax withholding | −41,916 | $76.30 | $3.20M | 323,124 |
| Amanda Michelle Morgan Chief Commercial Officer | Mar 2, 2026 | Tax withholding | −3,336 | $76.30 | $254.54K | 38,540 |
| Amanda Michelle Morgan Chief Commercial Officer | Mar 2, 2026 | Award | +2,782 | – | – | 41,876 |
| Amanda Michelle Morgan Chief Commercial Officer | Dec 15, 2025 | Tax withholding | −368 | $66.57 | $24.50K | 39,094 |
| Mary Anne Heino Executive Chair, Director | Nov 17, 2025 | Award | +14,285 | – | – | 332,935 |
| Robert J. Marshall Jr. CFO and Treasurer | Aug 29, 2025 | Tax withholding | −727 | $54.90 | $39.91K | 88,133 |
| Joshua J. Dapice – | Aug 20, 2025 | Sale | −3,365,000 | $56.15 | $188.94M | 3,477,227 |
| Mark C. Wehrly – | Aug 20, 2025 | Sale | −3,365,000 | $56.15 | $188.94M | 3,477,227 |
| Joshua J. Dapice – | Aug 19, 2025 | Sale | −41,000 | $55.34 | $2.27M | 6,842,227 |
| Mark C. Wehrly – | Aug 19, 2025 | Sale | −41,000 | $55.34 | $2.27M | 6,842,227 |
| Ludger Dinkelborg See Remarks | Aug 15, 2025 | Award | +14,765 | – | – | 14,765 |
| Kimberly Brown Chief Accounting Officer | Aug 15, 2025 | Tax withholding | −463 | $54.18 | $25.09K | 7,701 |
| Paul Blanchfield President | Aug 13, 2025 | Sale(10b5-1 plan) | −3,060 | $53.57 | $163.92K | 108,214 |
| Paul Blanchfield President | Jul 15, 2025 | Tax withholding | −518 | $81.26 | $42.09K | 111,274 |
| Daniel Niedzwiecki See Remarks | Jun 13, 2025 | Sale(10b5-1 plan) | −6,000 | $78.74 | $472.44K | 87,057 |
| Julie McHugh Director | Jun 9, 2025 | Sale(10b5-1 plan) | −5,192 | $81.62 | $423.77K | 25,962 |
| Robert J. Marshall Jr. CFO and Treasurer | Jun 9, 2025 | Option exercise | +14,773 | $49.93 | $737.62K | 128,633 |
| Robert J. Marshall Jr. CFO and Treasurer | Jun 9, 2025 | Sale(10b5-1 plan) | −27,036 | $83.40 | $2.25M | 88,860 |
| Robert J. Marshall Jr. CFO and Treasurer | Jun 9, 2025 | Sale(10b5-1 plan) | −9,243 | $82.50 | $762.55K | 115,896 |
| Robert J. Marshall Jr. CFO and Treasurer | Jun 9, 2025 | Sale(10b5-1 plan) | −3,494 | $81.27 | $283.96K | 125,139 |
| Daniel Niedzwiecki See Remarks | Jun 5, 2025 | Sale(10b5-1 plan) | −6,000 | $79.65 | $477.90K | 93,057 |
| Paul Blanchfield President | Jun 5, 2025 | Sale(10b5-1 plan) | −6,599 | $79.65 | $525.61K | 111,792 |
| Mary Anne Heino Director | Jun 2, 2025 | Sale(10b5-1 plan) | −3,140 | $74.90 | $235.19K | 341,576 |
| Mary Anne Heino Director | Jun 2, 2025 | Sale(10b5-1 plan) | −22,926 | $77.09 | $1.77M | 318,650 |
| Mary Anne Heino Director | May 27, 2025 | Gift | −179,300 | – | – | 40,434 |
| Mary Anne Heino Director | May 27, 2025 | Gift | +179,300 | – | – | 179,300 |
| Gary J. Pruden Director | May 15, 2025 | Gift | +2,635 | – | – | 14,613 |
| Gary J. Pruden Director | May 15, 2025 | Gift | −2,635 | – | – | 2,537 |
| Julia Marie Eastland Director | May 14, 2025 | Award | +2,537 | – | – | 3,882 |
| Minnie Baylor-Henry Director | May 14, 2025 | Award | +2,537 | – | – | 9,881 |
| Gary J. Pruden Director | May 14, 2025 | Award | +2,537 | – | – | 5,172 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Short interest
Shares sold short and not yet bought back, as of Oct 30, 2026 (FINRA, reported twice a month)
Short % of float
5.71%
4M shares short
Days to cover
3.2
At 1M shares a day
Change since last report
+0.2%
From 4M shares
Short volume, 20 days
31.6%
Of volume reported to FINRA
Shares sold short, last 12 months
Short sale volume counts trades marked short on any given day, including market-maker hedging, so it runs far higher than the share of Lantheus's stock actually held short. Settlement fails (shares not delivered on time) peaked at 12,800 shares on Oct 8, 2026 over the last 90 days.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| Paul Blanchfield Former Officer | Feb 2, 2026 | 6,713 | $449.57K | Feb 2, 2026 | Restricted Stock Vesting |
| Paul Blanchfield Former Officer | Jan 6, 2026 | 7,217 | $501.80K | Jan 6, 2026 | Option Granted - 03/01/2024 |
| Paul Blanchfield Officer | Dec 12, 2025 | 3,265 | $218.15K | Dec 12, 2025 | Restricted Stock Vesting |
| Paul Blanchfield Former Officer | Nov 26, 2025 | 11,776 | $686.66K | Nov 26, 2025 | Options Granted - 03/03/2022 |
| Paul Blanchfield Former Officer | Nov 14, 2025 | 16,530 | $871.11K | Nov 14, 2025 | ESPP Purchase |
| Paul Blanchfield Officer | Aug 13, 2025 | 3,060 | $163.92K | Aug 13, 2025 | ESPP Purchase |
| Daniel Niedzwiecki Officer | Jun 13, 2025 | 6,000 | $472.44K | Jun 13, 2025 | Restricted Stock Vesting |
| Julie McHugh Director | Jun 9, 2025 | 5,192 | $423.77K | Jun 9, 2025 | Restricted Stock Vesting |
| Robert J. Marshall Jr. Officer | Jun 9, 2025 | 39,773 | $3.25M | Jun 9, 2025 | Restricted Stock Vesting |
| Paul Blanchfield Officer | Jun 5, 2025 | 6,599 | $525.61K | Jun 5, 2025 | Restricted Stock Vesting |
| Mary Anne Heino Director | Jun 5, 2025 | 26,066 | $2.00M | Jun 2, 2025 | RSA Award |
| Daniel Niedzwiecki Officer | Jun 5, 2025 | 6,000 | $477.90K | Jun 5, 2025 | Restricted Stock Vesting |
| Robert J. Marshall Jr. Officer | Mar 17, 2025 | 10,000 | $1.01M | Mar 17, 2025 | Restricted Stock Vesting |
| Paul Blanchfield Officer | Mar 5, 2025 | 2,084 | $204.23K | Mar 5, 2025 | Restricted Stock Vesting |
| Mary Anne Heino Officer, Director | Feb 28, 2025 | 53,200 | $4.84M | Mar 3, 2025 | RSU Award |
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