Lantheus Holdings, Inc.
US ˙ NasdaqGM ˙ US5165441032

SecurityLNTH / Lantheus Holdings, Inc.
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership9,204 shares
Latest Disclosed Value $ 697,997
Advisor Group Holdings, Inc. reports 1.21% decrease in ownership of LNTH / Lantheus Holdings, Inc.

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 9,204 shares of Lantheus Holdings, Inc. (US:LNTH) valued at $698,123 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 9,317 shares of Lantheus Holdings, Inc.. This represents a change in shares of -1.21% during the quarter. The current value of the position is $929,420 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)
2026-05-15 2026-03-31 13F LANTHEUS HLDGS COM 516544103 9,204 -113 -1.21 698 12.60 0.0006
2026-02-17 2025-12-31 13F LANTHEUS HLDGS COM 516544103 9,317 -2,493 -21.11 620 -0.80 0.0009
2025-11-14 2025-09-30 13F LANTHEUS HLDGS COM 516544103 11,810 -11,367 -49.04 624 -69.19 0.0009
2025-09-04 2025-06-30 13F/A-1 ANTHEUS HLDGS COM 516544103 23,177 15,900 218.50 2,026 185.21 0.0036
2025-08-13 2025-06-30 13F ANTHEUS HLDGS COM 516544103 11,057 3,780 1,044 0.0012
2025-05-12 2025-03-31 13F LANTHEUS HLDGS COM 516544103 7,277 2,389 48.87 710 62.47 0.0016
2025-06-06 2024-12-31 13F/A-1 LANTHEUS HLDGS COM 516544103 4,888 -10,631 -68.50 437 -74.34 0.0010
2025-02-07 2024-12-31 13F LANTHEUS HLDGS COM 516544103 10,280 -5,239 1,057 0.0027
2024-11-13 2024-09-30 13F LANTHEUS HLDGS COM 516544103 15,519 7,117 84.71 1,703 152.67 0.0038
2024-08-13 2024-06-30 13F LANTHEUS HLDGS COM 516544103 8,402 -1,597 -15.97 675 8.36 0.0016
2024-05-10 2024-03-31 13F LANTHEUS HLDGS COM 516544103 9,999 -9,108 -47.67 622 -47.47 0.0014
2024-02-12 2023-12-31 13F LANTHEUS HLDGS COM 516544103 19,107 -9,216 -32.54 1,185 -39.81 0.0021
2023-11-13 2023-09-30 13F LANTHEUS HLDGS COM 516544103 28,323 -32,332 -53.30 1,968 -61.36 0.0029
2023-08-21 2023-06-30 13F/A-1 LANTHEUS HLDGS COM 516544103 60,655 -23,256 -27.72 5,090 -26.53 0.0091
2023-08-10 2023-06-30 13F LANTHEUS HLDGS COM 516544103 61,568 -22,343 5,089 0.0014
2023-05-12 2023-03-31 13F LANTHEUS HLDGS COM 516544103 83,911 46,659 125.25 6,928 265.21 0.0130
2023-02-10 2022-12-31 13F LANTHEUS HLDGS COM 516544103 37,252 14,686 65.08 1,897 19.53 0.0038
2022-11-14 2022-09-30 13F LANTHEUS HLDGS COM 516544103 22,566 -11,396 -33.56 1,587 -29.21 0.0036
2022-08-10 2022-06-30 13F LANTHEUS HLDGS COM 516544103 33,962 -9,063 -21.06 2,242 -5.84 0.0049
2022-05-04 2022-03-31 13F LANTHEUS HLDGS COM 516544103 43,025 25,449 144.79 2,381 369.63 0.0046
2022-02-03 2021-12-31 13F LANTHEUS HLDGS COM 516544103 17,576 1,031 6.23 507 19.29 0.0010
2021-11-05 2021-09-30 13F LANTHEUS HLDGS COM 516544103 16,545 231 1.42 425 -5.76 0.0009
2021-08-02 2021-06-30 13F LANTHEUS HLDGS COM 516544103 16,314 -426 -2.54 451 26.33 0.0010
2021-05-13 2021-03-31 13F LANTHEUS HLDGS COM 516544103 16,740 1,521 9.99 357 74.15 0.0009
2021-02-10 2020-12-31 13F LANTHEUS HLDGS COM 516544103 15,219 -2,433 -13.78 205 -8.48 0.0005
2020-11-12 2020-09-30 13F LANTHEUS HLDGS COM 516544103 17,652 16,329 1,234.24 224 1,078.95 0.0007
2020-08-14 2020-06-30 13F LANTHEUS HLDGS COM 516544103 1,323 -169 -11.33 19 0.00 0.0001
2020-05-18 2020-03-31 13F LANTHEUS HLDGS COM 516544103 1,492 1,492 19 0.0001
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.