Lantheus Holdings, Inc.
LNTH- Exchange
- Nasdaq
- Industry
- In Vitro & In Vivo Diagnostic Substances
- SEC CIK
- 0001521036
No open-market purchases or sales by Lantheus Holdings, Inc. insiders were filed in the last 90 days; 467 institutions reported holding it in 13F filings for Q2 2026, worth $8.34B in total; no superinvestor holds it.
Holders of 5% or more of LNTH
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Lantheus Holdings, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Farallon Capital Management, L.L.C. | 13G/A | 8.60%5.58M shares | – | Aug 13, 20261 filing | Aug 13, 2026 | SEC |
| Farallon Capital Partners, L.P. | 13G/A | 8.20%5.43M shares | +3.10 ppfrom 5.10% | Nov 14, 20245 filings | Feb 5, 2026 | SEC |
| Janus Henderson Group PLC | 13G/A | 7.40%4.77M shares | −1.20 ppfrom 8.60% | Feb 14, 20249 filings | May 15, 2026 | SEC |
| FMR LLC | 13G/A | 6.50%4.40M shares | −1.00 ppfrom 7.50% | Aug 6, 20252 filings | Nov 5, 2025 | SEC |
| Vanguard Capital Management LLC | 13G | 5.25%3.42M shares | New | Apr 30, 20261 filing | Apr 30, 2026 | SEC |
| Vanguard Portfolio Management LLC | 13G | 5.06%3.30M shares | New | Jul 31, 20261 filing | Jul 31, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
42 Schedule 13D and 13G filings on Lantheus Holdings, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Aug 13, 20265:16 PM ET | Farallon Capital Management, L.L.C.and 28 others | 13G/A | 8.60%5.58M shares | – | Jun 30, 2026 | SEC |
| Jul 31, 202611:19 AM ET | Vanguard Portfolio Management LLC | 13G | 5.06%3.30M shares | New | Jun 30, 2026 | SEC |
| May 15, 202612:38 PM ET | Janus Henderson Group PLC | 13G/A | 7.40%4.77M shares | −1.20 ppfrom 8.60% | Mar 31, 2026 | SEC |
| Apr 30, 202611:00 AM ET | Vanguard Capital Management LLC | 13G | 5.25%3.42M shares | New | Mar 31, 2026 | SEC |
| Mar 27, 202610:20 AM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | –Below 5% | Mar 13, 2026 | SEC |
| Feb 17, 20264:34 PM ET | Janus Henderson Group PLC | 13G/A | 8.60%5.71M shares | −1.20 ppfrom 9.80% | Dec 31, 2025 | SEC |
| Feb 12, 202612:50 PM ET | Morgan Stanleyand 1 other | 13G/A | 2.50%1.64M shares | −3.10 ppfrom 5.60%Below 5% | Dec 31, 2025 | SEC |
| Feb 5, 20262:59 PM ET | Farallon Capital Partners, L.P.and 30 others | 13G/A | 8.20%5.43M shares | +3.10 ppfrom 5.10% | Dec 31, 2025 | SEC |
| Nov 14, 202512:03 PM ET | Janus Henderson Group PLC | 13G/A | 9.80%6.68M shares | −0.20 ppfrom 10.00% | Sep 30, 2025 | SEC |
| Nov 12, 202512:22 PM ET | Farallon Capital Partners, L.P.and 29 others | 13G/A | 5.10%3.48M shares | −3.70 ppfrom 8.80% | Sep 30, 2025 | SEC |
| Nov 7, 202512:14 PM ET | Morgan Stanleyand 1 other | 13G | 5.60%3.78M shares | New | Sep 30, 2025 | SEC |
| Nov 5, 202511:40 AM ET | FMR LLCand 1 other | 13G/A | 6.50%4.40M shares | −1.00 ppfrom 7.50% | Sep 30, 2025 | SEC |
| Aug 14, 202511:17 AM ET | Janus Henderson Group PLC | 13G/A | 10.00%6.94M shares | −0.10 ppfrom 10.10% | Jun 30, 2025 | SEC |
| Aug 6, 202512:06 PM ET | FMR LLCand 1 other | 13G | 7.50%5.22M shares | New | Jun 30, 2025 | SEC |
| Jun 6, 202511:59 AM ET | Janus Henderson Group PLC | 13G/A | 10.10%6.96M shares | +0.60 ppfrom 9.50% | May 30, 2025 | SEC |
| May 14, 202512:16 PM ET | Janus Henderson Group PLC | 13G/A | 9.50%6.52M shares | +0.60 ppfrom 8.90% | Mar 31, 2025 | SEC |
| May 8, 20254:09 PM ET | Farallon Capital Partners, L.P.and 29 others | 13G/A | 8.80%6.02M shares | +1.20 ppfrom 7.60% | Mar 31, 2025 | SEC |
| Feb 14, 202512:11 PM ET | Janus Henderson Group PLC | 13G/A | 8.90%6.20M shares | – | Dec 31, 2024 | SEC |
| Feb 5, 20251:10 PM ET | Farallon Capital Partners, L.P.and 29 others | 13G/A | 7.60%5.32M shares | – | Dec 31, 2024 | SEC |
| Nov 14, 2024 | Janus Henderson Group PLC | 13G/AOld format | – | – | – | SEC |
| Nov 14, 2024 | Farallon Capital Partners, L.P. | 13GOld format | – | New | – | SEC |
| Feb 14, 2024 | Janus Henderson Group PLC | 13GOld format | – | New | – | SEC |
| Feb 13, 2024 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Jan 23, 20244:13 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Feb 10, 20232:11 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2023 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Jan 26, 20238:52 AM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Jan 20, 20235:17 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Jul 11, 2022 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Feb 15, 2022 | Armistice Capital, LLC | 13G/AOld format | – | – | – | SEC |
| Feb 14, 2022 | Price T Rowe Associates Inc | 13G/AOld format | – | – | – | SEC |
| Feb 10, 2022 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Feb 4, 2022 | Wellington Trust Co N A | 13G/AOld format | – | – | – | SEC |
| Jan 26, 20228:18 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Jan 25, 202211:15 AM ET | BlackRock Inc. | 13GOld format | – | – | – | SEC |
| Dec 10, 2021 | Wellington Management Group LLP | 13G/AOld format | – | – | – | SEC |
| Feb 16, 2021 | Armistice Capital, LLC | 13G/AOld format | – | – | – | SEC |
| Feb 16, 2021 | Price T Rowe Associates Inc | 13G/AOld format | – | – | – | SEC |
| Feb 10, 2021 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Feb 4, 2021 | Wellington Management Group LLP | 13G/AOld format | – | – | – | SEC |
| Feb 3, 2021 | Wellington Trust Co N A | 13GOld format | – | New | – | SEC |
| Jan 25, 20214:49 PM ET | BlackRock Inc. | 13GOld format | – | New | – | SEC |
Form 144: proposed insider sales
16 notices from officers, directors and other affiliates planning to sell Lantheus Holdings, Inc. shares, newest first.
| Filed (ET) | Seller | Shares to sell | Market value | Planned sale | Broker | Filing |
|---|---|---|---|---|---|---|
| Mar 27, 202312:01 PM ET | Heino Mary AnneOfficer · Director | 44.5K | $3.61M | Mar 27, 202310b5-1 | Fidelity Brokerage Services LLC | SEC |
| Mar 27, 202310:26 AM ET | Leno Sam RDirector | 7.01K | $568.9K | Mar 27, 202310b5-1 | Fidelity Brokerage Services LLC | SEC |
| Mar 27, 20239:45 AM ET | Markison Brian ADirector | 13.3K | $1.08M | Mar 27, 202310b5-1 | Fidelity Brokerage Services LLC | SEC |
| Mar 15, 202311:32 AM ET | Marshall Robert J. Jr.Officer | 5.00K | $357.9K | Mar 15, 202310b5-1 | Fidelity Brokerage Services LLC | SEC |
| Mar 14, 202312:00 PM ET | Yao Ying VivianOfficer | 4.00K | $290.9K | Mar 14, 2023 | Fidelity Brokerage Services LLC | SEC |
| Mar 8, 20231:04 PM ET | Yao Ying VivianOfficer | 2.41K | $183.3K | Mar 8, 2023 | Fidelity Brokerage Services LLC | SEC |
| Mar 7, 20233:33 PM ET | Sabens AndreaOfficer | 950 | $68.5K | Mar 7, 2023 | Fidelity Brokerage Services LLC | SEC |
| Mar 7, 20233:32 PM ET | Marshall Robert J. Jr.Officer | 4.85K | $350.2K | Mar 7, 2023 | Fidelity Brokerage Services LLC | SEC |
| Mar 7, 20233:31 PM ET | Niedzwiecki DanielOfficer | 1.05K | $76.1K | Mar 7, 2023 | Fidelity Brokerage Services LLC | SEC |
| Mar 7, 20233:25 PM ET | Montagut EtienneOfficer | 3.53K | $254.8K | Mar 7, 2023 | Fidelity Brokerage Services LLC | SEC |
| Mar 7, 20233:23 PM ET | Blanchfield PaulOfficer | 2.76K | $199.0K | Mar 7, 2023 | Fidelity Brokerage Services LLC | SEC |
| Mar 6, 20234:20 PM ET | Blanchfield PaulOfficer | 5.25K | $380.9K | Mar 6, 2023 | Fidelity Brokerage Services LLC | SEC |
| Mar 6, 20233:40 PM ET | Marshall Robert J. Jr.Officer | 20.6K | $1.49M | Mar 6, 2023 | Fidelity Brokerage Services LLC | SEC |
| Mar 6, 20233:37 PM ET | Niedzwiecki DanielOfficer | 9.08K | $658.8K | Mar 6, 2023 | Fidelity Brokerage Services LLC | SEC |
| Mar 6, 20233:35 PM ET | Montagut EtienneOfficer | 14.2K | $1.03M | Mar 6, 2023 | Fidelity Brokerage Services LLC | SEC |
| Mar 6, 20233:34 PM ET | Sabens AndreaOfficer | 7.71K | $559.1K | Mar 6, 2023 | Fidelity Brokerage Services LLC | SEC |