Alkermes plc
US ˙ NasdaqGS ˙ IE00B56GVS15

SecurityALKS / Alkermes plc
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership4,522,378 shares
Latest Disclosed Value $ 159,850,354
Dimensional Fund Advisors Lp reports 2.48% increase in ownership of ALKS / Alkermes plc

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 4,522,378 shares of Alkermes plc (US:ALKS) valued at $159,911,286 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 4,412,783 shares of Alkermes plc. This represents a change in shares of 2.48% during the quarter. The current value of the position is $193,376,883 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 ALKERMES SHS G01767105 4,522,378 109,595 2.48 159,850 29.47 0.0072
2026-02-12 2025-12-31 13F ALKERMES SHS G01767105 4,412,783 714,787 19.33 123,467 11.31 0.0259
2025-11-12 2025-09-30 13F ALKERMES SHS G01767105 3,697,996 601,359 19.42 110,925 25.20 0.0238
2025-08-12 2025-06-30 13F ALKERMES SHS G01767105 3,096,637 105,632 3.53 88,599 -10.29 0.0205
2025-05-13 2025-03-31 13F ALKERMES SHS G01767105 2,991,005 -28,503 -0.94 98,763 13.73 0.0245
2025-02-13 2024-12-31 13F ALKERMES SHS G01767105 3,019,508 128,701 4.45 86,842 7.33 0.0209
2024-11-07 2024-09-30 13F ALKERMES SHS G01767105 2,890,807 6,795 0.24 80,909 16.40 0.0196
2024-08-09 2024-06-30 13F ALKERMES SHS G01767105 2,884,012 371,039 14.76 69,507 2.18 0.0182
2024-05-10 2024-03-31 13F ALKERMES SHS G01767105 2,512,973 109,778 4.57 68,026 2.04 0.0184
2024-02-07 2023-12-31 13F ALKERMES SHS G01767105 2,403,195 90,219 3.90 66,666 2.90 0.0195
2023-11-09 2023-09-30 13F ALKERMES SHS G01767105 2,312,976 114,189 5.19 64,788 -5.86 0.0212
2023-08-09 2023-06-30 13F ALKERMES SHS G01767105 2,198,787 32,865 1.52 68,822 12.72 0.0219
2023-05-12 2023-03-31 13F ALKERMES SHS G01767105 2,165,922 17,712 0.82 61,055 108,926.79 0.0206
2023-02-09 2022-12-31 13F ALKERMES SHS G01767105 2,148,210 78,132 3.77 56 -99.88 0.0166
2022-11-10 2022-09-30 13F ALKERMES SHS G01767105 2,070,078 -44,153 -2.09 46,226 -26.61 0.0177
2022-08-12 2022-06-30 13F ALKERMES SHS G01767105 2,114,231 -23,333 -1.09 62,984 11.99 0.0226
2022-05-13 2022-03-31 13F ALKERMES CLA G01767105 2,137,564 -47,232 -2.16 56,241 10.67 0.0173
2022-02-09 2021-12-31 13F ALKERMES CLA G01767105 2,184,796 112,077 5.41 50,819 -20.50 0.0154
2021-11-12 2021-09-30 13F ALKERMES CLA G01767105 2,072,719 290,637 16.31 63,924 46.30 0.0206
2021-08-12 2021-06-30 13F ALKERMES CLA G01767105 1,782,082 485,629 37.46 43,695 80.62 0.0138
2021-05-14 2021-03-31 13F ALKERMES CLA G01767105 1,296,453 390,553 43.11 24,192 33.83 0.0080
2021-03-08 2020-12-31 13F/A-2 ALKERMES CLA G01767105 905,900 14,671 1.65 18,077 22.41 0.0065
2021-02-11 2020-12-31 13F ALKERMES CLA G01767105 905,900 14,671 18,077 6,528.4516
2020-11-12 2020-09-30 13F ALKERMES CLA G01767105 891,229 97,256 12.25 14,767 -4.15 0.0063
2020-08-13 2020-06-30 13F ALKERMES CLA G01767105 793,973 64,203 8.80 15,406 46.40 0.0068
2020-05-14 2020-03-31 13F ALKERMES CLA G01767105 729,770 134,607 22.62 10,523 -13.32 0.0055
2020-02-14 2019-12-31 13F ALKERMES CLA G01767105 595,163 48,220 8.82 12,140 13.76 0.0044
2019-11-12 2019-09-30 13F ALKERMES CLA G01767105 546,943 88,522 19.31 10,672 3.30 0.0041
2019-08-13 2019-06-30 13F ALKERMES CLA G01767105 458,421 9,425 2.10 10,331 -36.93 0.0040
2019-08-12 2019-03-31 13F/A-2 ALKERMES CLA G01767105 448,996 87,539 24.22 16,380 53.60 0.0065
2019-05-10 2019-03-31 13F ALKERMES CLA G01767105 448,996 87,539 16,380
2019-02-26 2018-12-31 13F/A-1 ALKERMES CLA G01767105 361,457 133,233 58.38 10,664 10.07 0.0048
2019-02-13 2018-12-31 13F ALKERMES CLA G01767105 361,457 133,233 10,664
2018-11-13 2018-09-30 13F ALKERMES CLA G01767105 228,224 11,667 5.39 9,688 8.70 0.0037
2018-08-10 2018-06-30 13F ALKERMES CLA G01767105 216,557 4,282 2.02 8,913 -27.55 0.0036
2018-05-11 2018-03-31 13F ALKERMES CLA G01767105 212,275 11,091 5.51 12,303 11.71 0.0051
2018-02-12 2017-12-31 13F ALKERMES CLA G01767105 201,184 3,049 1.54 11,013 9.30 0.0046
2017-11-13 2017-09-30 13F ALKERMES CLA G01767105 198,135 2,027 1.03 10,076 -11.37 0.0044
2017-08-11 2017-06-30 13F ALKERMES CLA G01767105 196,108 1,577 0.81 11,369 -0.11 0.0052
2017-05-12 2017-03-31 13F ALKERMES CLA G01767105 194,531 2,891 1.51 11,381 6.85 0.0054
2017-02-09 2016-12-31 13F ALKERMES CLA G01767105 191,640 7,797 4.24 10,651 23.19 0.0053
2016-11-10 2016-09-30 13F ALKERMES CLA G01767105 183,843 14,577 8.61 8,646 18.18 0.0047
2016-08-09 2016-06-30 13F ALKERMES CLA G01767105 169,266 -6,698 -3.81 7,316 21.67 0.0042
2016-05-13 2016-03-31 13F ALKERMES CLA G01767105 175,964 14,535 9.00 6,013 -53.07 0.0036
2016-02-10 2015-12-31 13F ALKERMES CLA G01767105 161,429 3,016 1.90 12,813 37.94 0.0080
2015-11-13 2015-09-30 13F ALKERMES CLA G01767105 158,413 -26,941 -14.53 9,289 -22.10 0.0061
2015-08-14 2015-06-30 13F ALKERMES CLA G01767105 185,354 -55,105 -22.92 11,924 -18.67 0.0073
2015-05-14 2015-03-31 13F ALKERMES CLA G01767105 240,459 -34,123 -12.43 14,662 -8.81 0.0093
2015-02-06 2014-12-31 13F ALKERMES CLA G01767105 274,582 -77,650 -22.05 16,079 6.47 0.0106
2014-11-13 2014-09-30 13F ALKERMES CLA G01767105 352,232 -64,190 -15.41 15,102 -27.95 0.0107
2014-08-08 2014-06-30 13F ALKERMES CLA G01767105 416,422 -1,436 -0.34 20,960 13.78 0.0146
2014-05-14 2014-03-31 13F ALKERMES CLA G01767105 417,858 -111,961 -21.13 18,421 -14.49 0.0138
2014-02-12 2013-12-31 13F ALKERMES CLA G01767105 529,819 -143,615 -21.33 21,542 -4.85 0.0168
2013-11-13 2013-09-30 13F ALKERMES CLA G01767105 673,434 -10,948 -1.60 22,640 15.34 0.0196
2013-08-15 2013-06-30 13F ALKERMES CLA G01767105 684,382 684,382 19,629 0.0185
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.