Alkermes plc
US ˙ NasdaqGS ˙ IE00B56GVS15

SecurityALKS / Alkermes plc
InstitutionMan Group plc
Latest Disclosed Ownership625,046 shares
Latest Disclosed Value $ 22,101,626
Man Group plc reports 100.01% increase in ownership of ALKS / Alkermes plc

On May 15, 2026 - Man Group plc filed a 13F-HR form disclosing ownership of 625,046 shares of Alkermes plc (US:ALKS) valued at $22,101,627 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 312,512 shares of Alkermes plc. This represents a change in shares of 100.01% during the quarter. The current value of the position is $26,726,967 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 ALKERMES SHS G01767105 625,046 312,534 100.01 22,102 152.76 0.0401
2026-02-17 2025-12-31 13F ALKERMES SHS G01767105 312,512 -584,762 -65.17 8,744 -67.52 0.0149
2025-11-14 2025-09-30 13F ALKERMES SHS G01767105 897,274 621,452 225.31 26,918 241.12 0.0468
2025-08-14 2025-06-30 13F ALKERMES SHS G01767105 275,822 139,994 103.07 7,891 75.94 0.0150
2025-05-15 2025-03-31 13F ALKERMES SHS G01767105 135,828 27,176 25.01 4,485 43.57 0.0114
2025-02-14 2024-12-31 13F ALKERMES SHS G01767105 108,652 -119,905 -52.46 3,125 -51.16 0.0082
2024-11-14 2024-09-30 13F ALKERMES SHS G01767105 228,557 -288,274 -55.78 6,397 -48.64 0.0167
2024-08-14 2024-06-30 13F ALKERMES SHS G01767105 516,831 -356,802 -40.84 12,456 -47.33 0.0315
2024-05-15 2024-03-31 13F ALKERMES SHS G01767105 873,633 -52,556 -5.67 23,649 -7.95 0.0596
2024-02-14 2023-12-31 13F ALKERMES SHS G01767105 926,189 25,692 73.79 0.0715
2023-11-14 2023-09-30 13F ALKERMES SHS G01767105 14,784 2,235.39 0.0458
2023-08-14 2023-06-30 13F ALKERMES SHS G01767105 20,229 633 -43.83 0.0020
2023-05-15 2023-03-31 13F ALKERMES SHS G01767105 1,128 -85.80 0.0040
2023-02-14 2022-12-31 13F ALKERMES SHS G01767105 303,651 111,243 57.82 7,934 84.64 0.0284
2022-11-14 2022-09-30 13F ALKERMES SHS G01767105 192,408 4,297 -48.44 0.0199
2022-08-15 2022-06-30 13F ALKERMES SHS G01767105 8,334 253.74 0.0353
2022-05-16 2022-03-31 13F ALKERMES SHS G01767105 89,560 8,930 11.08 2,356 25.65 0.0082
2022-02-14 2021-12-31 13F ALKERMES SHS G01767105 80,630 -14,143 -14.92 1,875 -35.85 0.0060
2021-11-15 2021-09-30 13F ALKERMES SHS G01767105 94,773 40,451 74.47 2,923 119.44 0.0103
2021-08-16 2021-06-30 13F ALKERMES SHS G01767105 54,322 -226,897 -80.68 1,332 -74.64 0.0047
2021-05-17 2021-03-31 13F ALKERMES SHS G01767105 281,219 -14,588 -4.93 5,253 -10.98 0.0231
2021-02-16 2020-12-31 13F ALKERMES SHS G01767105 295,807 -62,761 -17.50 5,901 -0.69 0.0259
2020-11-16 2020-09-30 13F ALKERMES SHS G01767105 358,568 283,419 377.14 5,942 307.54 0.0234
2020-08-14 2020-06-30 13F ALKERMES SHS G01767105 75,149 -48,117 -39.04 1,458 -18.00 0.0074
2020-05-15 2020-03-31 13F ALKERMES SHS G01767105 123,266 -136,379 -52.53 1,778 -66.43 0.0115
2020-02-18 2019-12-31 13F ALKERMES SHS G01767105 259,645 140,064 117.13 5,296 127.00 0.0174
2019-11-14 2019-09-30 13F ALKERMES SHS G01767105 119,581 8,235 7.40 2,333 -7.05 0.0087
2019-08-14 2019-06-30 13F ALKERMES SHS G01767105 111,346 104,755 1,589.36 2,510 945.83 0.0091
2019-05-15 2019-03-31 13F ALKERMES SHS G01767105 6,591 -1,186 -15.25 240 4.80 0.0009
2019-02-14 2018-12-31 13F ALKERMES SHS G01767105 7,777 -73,500 -90.43 229 -93.36 0.0010
2018-11-14 2018-09-30 13F ALKERMES SHS G01767105 81,277 59,491 273.07 3,449 284.50 0.0126
2018-08-14 2018-06-30 13F ALKERMES SHS G01767105 21,786 14,136 184.78 897 102.48 0.0037
2018-05-15 2018-03-31 13F ALKERMES SHS G01767105 7,650 7,650 443 0.0020
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.