Lantheus Holdings, Inc.
US ˙ NasdaqGM ˙ US5165441032

SecurityLNTH / Lantheus Holdings, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership1,379,570 shares
Latest Disclosed Value $ 104,625,767
Dimensional Fund Advisors Lp reports 2.54% decrease in ownership of LNTH / Lantheus Holdings, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 1,379,570 shares of Lantheus Holdings, Inc. (US:LNTH) valued at $104,640,384 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 1,415,463 shares of Lantheus Holdings, Inc.. This represents a change in shares of -2.54% during the quarter. The current value of the position is $138,301,892 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-07 2026-03-31 13F LANTHEUS HLDGS COM 516544103 1,379,570 -35,893 -2.54 104,626 11.06 0.0047
2026-02-12 2025-12-31 13F LANTHEUS HLDGS COM 516544103 1,415,463 44,374 3.24 94,202 33.97 0.0198
2025-11-12 2025-09-30 13F LANTHEUS HLDGS COM 516544103 1,371,089 -12,042 -0.87 70,318 -37.89 0.0151
2025-08-12 2025-06-30 13F LANTHEUS HLDGS COM 516544103 1,383,131 4,595 0.33 113,223 -15.84 0.0262
2025-05-13 2025-03-31 13F LANTHEUS HLDGS COM 516544103 1,378,536 31,454 2.33 134,534 11.64 0.0334
2025-02-13 2024-12-31 13F LANTHEUS HLDGS COM 516544103 1,347,082 30,891 2.35 120,510 -16.57 0.0289
2024-11-07 2024-09-30 13F LANTHEUS HLDGS COM 516544103 1,316,191 76,689 6.19 144,441 45.13 0.0350
2024-08-09 2024-06-30 13F LANTHEUS HLDGS COM 516544103 1,239,502 19,071 1.56 99,525 31.02 0.0260
2024-05-10 2024-03-31 13F LANTHEUS HLDGS COM 516544103 1,220,431 73,395 6.40 75,960 6.81 0.0206
2024-02-07 2023-12-31 13F LANTHEUS HLDGS COM 516544103 1,147,036 -86,107 -6.98 71,117 -17.00 0.0208
2023-11-09 2023-09-30 13F LANTHEUS HLDGS COM 516544103 1,233,143 -129,061 -9.47 85,680 -25.05 0.0281
2023-08-09 2023-06-30 13F LANTHEUS HLDGS COM 516544103 1,362,204 -24,408 -1.76 114,315 -0.14 0.0364
2023-05-12 2023-03-31 13F LANTHEUS HLDGS COM 516544103 1,386,612 -60,336 -4.17 114,474 156,713.70 0.0386
2023-02-09 2022-12-31 13F LANTHEUS HLDGS COM 516544103 1,446,948 -245,665 -14.51 74 -99.94 0.0218
2022-11-10 2022-09-30 13F LANTHEUS HLDGS COM 516544103 1,692,613 32,320 1.95 119,039 8.59 0.0457
2022-08-12 2022-06-30 13F LANTHEUS HLDGS COM 516544103 1,660,293 -1,856 -0.11 109,622 19.24 0.0393
2022-05-13 2022-03-31 13F LANTHEUS HLDGS COM 516544103 1,662,149 -6,004 -0.36 91,936 90.76 0.0283
2022-02-09 2021-12-31 13F LANTHEUS HLDGS COM 516544103 1,668,153 -26,567 -1.57 48,195 10.74 0.0146
2021-11-12 2021-09-30 13F LANTHEUS HLDGS COM 516544103 1,694,720 102,689 6.45 43,521 -1.10 0.0140
2021-08-12 2021-06-30 13F LANTHEUS HLDGS COM 516544103 1,592,031 241,797 17.91 44,003 52.35 0.0139
2021-05-14 2021-03-31 13F LANTHEUS HLDGS COM 516544103 1,350,234 -145,525 -9.73 28,882 43.14 0.0096
2021-03-08 2020-12-31 13F/A-2 LANTHEUS HLDGS COM 516544103 1,495,759 -87,237 -5.51 20,177 0.61 0.0073
2021-02-11 2020-12-31 13F LANTHEUS HLDGS COM 516544103 1,495,759 -87,237 20,177 7,286.8599
2020-11-12 2020-09-30 13F LANTHEUS HLDGS COM 516544103 1,582,996 -33,486 -2.07 20,055 -13.24 0.0085
2020-08-13 2020-06-30 13F LANTHEUS HLDGS COM 516544103 1,616,482 262,166 19.36 23,115 33.77 0.0102
2020-05-14 2020-03-31 13F LANTHEUS HLDGS COM 516544103 1,354,316 -76,747 -5.36 17,280 -41.13 0.0090
2020-02-14 2019-12-31 13F LANTHEUS HLDGS COM 516544103 1,431,063 -41,880 -2.84 29,351 -20.50 0.0107
2019-11-12 2019-09-30 13F LANTHEUS HLDGS COM 516544103 1,472,943 3,715 0.25 36,920 -11.20 0.0143
2019-08-13 2019-06-30 13F LANTHEUS HLDGS COM 516544103 1,469,228 -2,654 -0.18 41,578 15.39 0.0161
2019-08-12 2019-03-31 13F/A-2 LANTHEUS HLDGS COM 516544103 1,471,882 92,865 6.73 36,032 66.96 0.0144
2019-05-10 2019-03-31 13F LANTHEUS HLDGS COM 516544103 1,471,882 92,865 36,032
2019-02-26 2018-12-31 13F/A-1 LANTHEUS HLDGS COM 516544103 1,379,017 65,609 5.00 21,581 9.91 0.0098
2019-02-13 2018-12-31 13F LANTHEUS HLDGS COM 516544103 1,379,017 65,609 21,581
2018-11-13 2018-09-30 13F LANTHEUS HLDGS COM 516544103 1,313,408 13,565 1.04 19,635 3.82 0.0075
2018-08-10 2018-06-30 13F LANTHEUS HLDGS COM 516544103 1,299,843 29,710 2.34 18,913 -6.35 0.0075
2018-05-11 2018-03-31 13F LANTHEUS HLDGS COM 516544103 1,270,133 122,554 10.68 20,195 -13.95 0.0084
2018-02-12 2017-12-31 13F LANTHEUS HLDGS COM 516544103 1,147,579 236,268 25.93 23,469 44.68 0.0097
2017-11-13 2017-09-30 13F LANTHEUS HLDGS COM 516544103 911,311 386,771 73.74 16,221 75.21 0.0071
2017-08-11 2017-06-30 13F LANTHEUS HLDGS COM 516544103 524,540 232,856 79.83 9,258 153.92 0.0043
2017-05-12 2017-03-31 13F LANTHEUS HLDGS COM 516544103 291,684 291,684 3,646 0.0017
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.