Lantheus Holdings, Inc.
US ˙ NasdaqGM ˙ US5165441032

SecurityLNTH / Lantheus Holdings, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership1,640,837 shares
Ownership 2.50%
Morgan Stanley ownership in LNTH / Lantheus Holdings, Inc.

2026-02-12 - Morgan Stanley has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 1,640,837 shares of Lantheus Holdings, Inc. (US:LNTH). This represents 2.5 percent ownership of the company. In their previous filing dated 2025-11-07 , Morgan Stanley had reported owning 3,777,712 shares, indicating a decrease of -56.57 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2026-02-12 2026-02-12 13G/A 3,777,712 1,640,837 -56.57 2.50 -55.36
2025-11-07 2025-11-07 13G 3,777,712 5.60

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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.

Upgrade to unlock premium data and export to Excel .

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 1,646,463 -111,106 -6.32 124,884 6.77 0.0075
2026-05-27 2025-12-31 13F/A-1 LANTHEUS HLDGS COM 516544103 1,757,569 -2,120,583 -54.68 116,966 -41.20 0.0070
2026-02-13 2025-12-31 13F LANTHEUS HLDGS COM 516544103 1,757,569 -2,120,583 116,966 0.0070
2026-05-27 2025-09-30 13F/A-1 LANTHEUS HLDGS COM 516544103 3,878,152 3,137,343 423.50 198,911 228.01 0.0120
2025-11-14 2025-09-30 13F LANTHEUS HLDGS COM 516544103 3,878,152 3,137,343 198,911 0.0120
2025-08-15 2025-06-30 13F LANTHEUS HLDGS COM 516544103 740,809 31,709 4.47 60,643 -12.38 0.0040
2025-05-15 2025-03-31 13F LANTHEUS HLDGS COM 516544103 709,100 -275,932 -28.01 69,208 -21.46 0.0049
2025-05-15 2024-12-31 13F/A-1 LANTHEUS HLDGS COM 516544103 985,032 221,561 29.02 88,121 5.17 0.0062
2025-02-14 2024-12-31 13F LANTHEUS HLDGS COM 516544103 985,032 221,561 88,121 0.0062
2025-05-14 2024-09-30 13F/A-2 LANTHEUS HLDGS COM 516544103 763,471 77,874 11.36 83,791 52.22 0.0061
2025-02-14 2024-09-30 13F/A-1 LANTHEUS HLDGS COM 516544103 763,471 77,874 83,791 0.0061
2024-11-14 2024-09-30 13F LANTHEUS HLDGS COM 516544103 763,471 77,874 83,791 0.0061
2025-05-14 2024-06-30 13F/A-2 LANTHEUS HLDGS COM 516544103 685,597 43,676 6.80 55,047 37.78 0.0043
2024-10-17 2024-06-30 13F/A-1 LANTHEUS HLDGS COM 516544103 685,597 43,676 55,047 0.0043
2024-08-14 2024-06-30 13F LANTHEUS HLDGS COM 516544103 685,597 43,676 55,047 0.0043
2024-10-17 2024-03-31 13F/A-2 LANTHEUS HLDGS COM 516544103 641,921 24,763 4.01 39,953 4.42 0.0032
2024-08-16 2024-03-31 13F/A-1 LANTHEUS HLDGS COM 516544103 641,921 24,763 39,953 0.0032
2024-05-15 2024-03-31 13F LANTHEUS HLDGS COM 516544103 641,921 24,763 39,953 0.0032
2024-08-16 2023-12-31 13F/A-1 LANTHEUS HLDGS COM 516544103 617,158 86,271 16.25 38,264 3.73 0.0034
2024-02-13 2023-12-31 13F LANTHEUS HLDGS COM 516544103 617,158 86,271 38,264 0.0034
2023-11-15 2023-09-30 13F LANTHEUS HLDGS COM 516544103 530,887 -328,307 -38.21 36,886 -48.84 0.0038
2023-08-14 2023-06-30 13F LANTHEUS HLDGS COM 516544103 859,194 144,029 20.14 72,104 22.12 0.0071
2023-05-15 2023-03-31 13F LANTHEUS HLDGS COM 516544103 715,165 108,201 17.83 59,044 90.90 0.0063
2023-02-14 2022-12-31 13F LANTHEUS HLDGS COM 516544103 606,964 -297,004 -32.86 30,931 -51.35 0.0035
2022-11-14 2022-09-30 13F LANTHEUS HLDGS COM 516544103 903,968 -46,678 -4.91 63,575 1.28 0.0087
2022-10-27 2022-06-30 13F/A-1 LANTHEUS HLDGS COM 516544103 950,646 508,203 114.86 62,772 156.53 0.0081
2022-08-15 2022-06-30 13F LANTHEUS HLDGS COM 516544103 950,646 508,203 62,772 0.0016
2022-10-27 2022-03-31 13F/A-1 LANTHEUS HLDGS COM 516544103 442,443 80,461 22.23 24,470 133.96 0.0033
2022-05-13 2022-03-31 13F LANTHEUS HLDGS COM 516544103 442,443 80,461 24,470 0.0033
2022-02-14 2021-12-31 13F LANTHEUS HLDGS COM 516544103 361,982 63,077 21.10 10,459 36.26 0.0013
2021-11-15 2021-09-30 13F LANTHEUS HLDGS COM 516544103 298,905 43,878 17.21 7,676 8.88 0.0010
2021-08-23 2021-06-30 13F/A-1 LANTHEUS HLDGS COM 516544103 255,027 83,817 48.96 7,050 92.62 0.0009
2021-08-16 2021-06-30 13F LANTHEUS HLDGS COM 516544103 255,027 83,817 7,050 0.0002
2021-05-17 2021-03-31 13F LANTHEUS HLDGS COM 516544103 171,210 -41,476 -19.50 3,660 27.53 0.0005
2021-02-16 2020-12-31 13F LANTHEUS HLDGS COM 516544103 212,686 36,583 20.77 2,870 28.64 0.0004
2020-11-13 2020-09-30 13F LANTHEUS HLDGS COM 516544103 176,103 -24,334 -12.14 2,231 -22.18 0.0004
2020-08-14 2020-06-30 13F LANTHEUS HLDGS COM 516544103 200,437 42,316 26.76 2,867 42.07 0.0006
2020-05-26 2020-03-31 13F/A-1 LANTHEUS HLDGS COM 516544103 158,121 -130,373 -45.19 2,018 -65.89 0.0005
2020-05-15 2020-03-31 13F LANTHEUS HLDGS COM 516544103 158,121 -130,373 2,018 155.0245
2020-02-14 2019-12-31 13F LANTHEUS HLDGS COM 516544103 288,494 156,748 118.98 5,917 79.14 0.0014
2019-11-14 2019-09-30 13F LANTHEUS HLDGS COM 516544103 131,746 -189,581 -59.00 3,303 -63.68 0.0009
2019-08-14 2019-06-30 13F LANTHEUS HLDGS COM 516544103 321,327 146,264 83.55 9,094 112.23 0.0024
2019-05-15 2019-03-31 13F LANTHEUS HLDGS COM 516544103 175,063 -269,298 -60.60 4,285 -38.39 0.0012
2019-02-14 2018-12-31 13F LANTHEUS HLDGS COM 516544103 444,361 378,976 579.61 6,955 611.87 0.0021
2019-04-23 2018-09-30 13F/A-2 LANTHEUS HLDGS COM 516544103 65,385 -26,781 -29.06 977 -27.14 0.0002
2018-11-20 2018-09-30 13F/A-1 LANTHEUS HLDGS COM 516544103 65,385 0 977 0.0002
2018-11-14 2018-09-30 13F LANTHEUS HLDGS COM 516544103 65,385 -26,781 977
2019-04-23 2018-06-30 13F/A-1 LANTHEUS HLDGS COM 516544103 92,166 -28,415 -23.57 1,341 -30.05 0.0004
2018-08-14 2018-06-30 13F LANTHEUS HLDGS COM 516544103 92,166 -28,415 1,341
2019-04-23 2018-03-31 13F/A-1 LANTHEUS HLDGS COM 516544103 120,581 45,185 59.93 1,917 24.24 0.0005
2018-05-14 2018-03-31 13F LANTHEUS HLDGS COM 516544103 120,581 45,185 1,917
2019-04-23 2017-12-31 13F/A-1 LANTHEUS HLDGS COM 516544103 75,396 -9,909 -11.62 1,543 1.65 0.0004
2018-02-14 2017-12-31 13F LANTHEUS HLDGS COM 516544103 75,396 -9,909 1,543
2017-11-14 2017-09-30 13F LANTHEUS HLDGS COM 516544103 85,305 -62,576 -42.32 1,518 -41.82 0.0005
2017-08-11 2017-06-30 13F LANTHEUS HLDGS COM 516544103 147,881 -212,232 -58.93 2,609 -42.05 0.0008
2017-05-22 2017-03-31 13F/A-1 LANTHEUS HLDGS COM 516544103 360,113 130,992 57.17 4,502 128.53 0.0014
2017-05-12 2017-03-31 13F LANTHEUS HLDGS COM 516544103 360,113 4,502
2017-02-22 2016-12-31 13F/A-1 LANTHEUS HLDGS COM 516544103 229,121 63,964 38.73 1,970 44.11 0.0006
2017-02-13 2016-12-31 13F LANTHEUS HLDGS COM 516544103 229,121 1,970
2016-11-10 2016-09-30 13F LANTHEUS HLDGS COM 516544103 165,157 70,508 74.49 1,367 293.95 0.0005
2016-08-12 2016-06-30 13F LANTHEUS HLDGS COM 516544103 94,649 27,912 41.82 347 175.40 0.0001
2016-05-12 2016-03-31 13F LANTHEUS HLDGS COM 516544103 66,737 6,723 11.20 126 -37.93 0.0000
2016-02-09 2015-12-31 13F LANTHEUS HLDGS COM 516544103 60,014 41,933 231.92 203 160.26 0.0001
2016-02-08 2015-09-30 13F/A-1 LANTHEUS HLDGS COM 516544103 18,081 18,081 78 0.0000
2015-11-09 2015-09-30 13F LANTHEUS HLDGS COM 516544103 18,081 78 0.0000
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.