Alkermes plc
US ˙ NasdaqGS ˙ IE00B56GVS15

SecurityALKS / Alkermes plc
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership2,516 shares
Latest Disclosed Value $ 88,965
Advisor Group Holdings, Inc. reports 6.01% decrease in ownership of ALKS / Alkermes plc

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 2,516 shares of Alkermes plc (US:ALKS) valued at $88,966 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 2,677 shares of Alkermes plc. This represents a change in shares of -6.01% during the quarter. The current value of the position is $107,584 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 2,516 -161 -6.01 89 18.92 0.0001
2026-02-17 2025-12-31 13F ALKERMES SHS G01767105 2,677 -39 -1.44 75 -6.33 0.0001
2025-11-14 2025-09-30 13F ALKERMES SHS G01767105 2,716 771 39.64 79 43.64 0.0001
2025-09-04 2025-06-30 13F/A-1 LKERMES SHS G01767105 1,945 701 56.35 56 34.15 0.0001
2025-08-13 2025-06-30 13F LKERMES SHS G01767105 2,139 895 61 0.0001
2025-05-12 2025-03-31 13F ALKERMES SHS G01767105 1,244 -6,074 -83.00 41 -80.48 0.0001
2025-06-06 2024-12-31 13F/A-1 ALKERMES SHS G01767105 7,318 -1,518 -17.18 210 -14.98 0.0005
2025-02-07 2024-12-31 13F ALKERMES SHS G01767105 6,958 -1,878 200 0.0005
2024-11-13 2024-09-30 13F ALKERMES SHS G01767105 8,836 1,398 18.80 247 37.99 0.0006
2024-08-13 2024-06-30 13F ALKERMES SHS G01767105 7,438 -2,406 -24.44 179 -32.71 0.0004
2024-05-10 2024-03-31 13F ALKERMES SHS G01767105 9,844 -1,610 -14.06 266 -16.09 0.0006
2024-02-12 2023-12-31 13F ALKERMES SHS G01767105 11,454 -2,108 -15.54 317 -16.36 0.0006
2023-11-13 2023-09-30 13F ALKERMES SHS G01767105 13,562 1,253 10.18 380 -1.30 0.0006
2023-08-21 2023-06-30 13F/A-1 ALKERMES SHS G01767105 12,309 -4,673 -27.52 385 -19.83 0.0007
2023-08-10 2023-06-30 13F ALKERMES SHS G01767105 12,521 -4,461 385 0.0001
2023-05-12 2023-03-31 13F ALKERMES SHS G01767105 16,982 1,277 8.13 479 16.83 0.0009
2023-02-10 2022-12-31 13F ALKERMES SHS G01767105 15,705 123 0.79 410 17.82 0.0008
2022-11-14 2022-09-30 13F ALKERMES SHS G01767105 15,582 1,165 8.08 348 -18.88 0.0008
2022-08-10 2022-06-30 13F ALKERMES SHS G01767105 14,417 -1,239 -7.91 429 4.13 0.0009
2022-05-04 2022-03-31 13F ALKERMES SHS G01767105 15,656 191 1.24 412 14.44 0.0008
2022-02-03 2021-12-31 13F ALKERMES SHS G01767105 15,465 9,949 180.37 360 110.53 0.0007
2021-11-05 2021-09-30 13F ALKERMES SHS G01767105 5,516 1,295 30.68 171 66.02 0.0004
2021-08-02 2021-06-30 13F ALKERMES SHS G01767105 4,221 -355 -7.76 103 21.18 0.0002
2021-05-13 2021-03-31 13F ALKERMES SHS G01767105 4,576 491 12.02 85 3.66 0.0002
2021-02-10 2020-12-31 13F ALKERMES SHS G01767105 4,085 11 0.27 82 22.39 0.0002
2020-11-12 2020-09-30 13F ALKERMES SHS G01767105 4,074 1,364 50.33 67 26.42 0.0002
2020-08-14 2020-06-30 13F ALKERMES SHS G01767105 2,710 -150 -5.24 53 29.27 0.0002
2020-05-18 2020-03-31 13F ALKERMES SHS G01767105 2,860 2,860 41 0.0002
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.