Alkermes plc
US ˙ NasdaqGS ˙ IE00B56GVS15

SecurityALKS / Alkermes plc
InstitutionAmeriprise Financial Inc
Latest Disclosed Ownership741,141 shares
Latest Disclosed Value $ 26,206,748
Ameriprise Financial Inc reports 39.48% increase in ownership of ALKS / Alkermes plc

On May 15, 2026 - Ameriprise Financial Inc filed a 13F-HR form disclosing ownership of 741,141 shares of Alkermes plc (US:ALKS) valued at $26,206,746 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 531,362 shares of Alkermes plc. This represents a change in shares of 39.48% during the quarter. The current value of the position is $31,691,189 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 COM G01767105 741,141 209,779 39.48 26,207 76.27 0.0011
2026-02-17 2025-12-31 13F ALKERMES COM G01767105 531,362 -26,504 -4.75 14,868 -11.16 0.0034
2025-11-14 2025-09-30 13F ALKERMES COM G01767105 557,866 -148,141 -20.98 16,736 -17.15 0.0038
2025-08-14 2025-06-30 13F ALKERMES COM G01767105 706,007 175,235 33.02 20,199 15.25 0.0050
2025-05-14 2025-03-31 13F ALKERMES COM G01767105 530,772 133,253 33.52 17,526 53.31 0.0047
2025-02-14 2024-12-31 13F ALKERMES COM G01767105 397,519 -83,441 -17.35 11,433 -15.08 0.0029
2024-11-14 2024-09-30 13F ALKERMES COM G01767105 480,960 -69,186 -12.58 13,462 1.54 0.0035
2024-08-14 2024-06-30 13F ALKERMES COM G01767105 550,146 -51,825 -8.61 13,259 -18.64 0.0036
2024-05-15 2024-03-31 13F ALKERMES COM G01767105 601,971 -53,738 -8.20 16,295 -10.41 0.0045
2024-02-14 2023-12-31 13F ALKERMES COM G01767105 655,709 435,075 197.19 18,189 194.37 0.0054
2023-11-14 2023-09-30 13F ALKERMES COM G01767105 220,634 -3,751 -1.67 6,180 -12.02 0.0020
2023-08-14 2023-06-30 13F ALKERMES COM G01767105 224,385 3,091 1.40 7,023 12.58 0.0022
2023-05-22 2023-03-31 13F/A-1 ALKERMES COM G01767105 221,294 12,955 6.22 6,238 14.56 0.0020
2023-05-15 2023-03-31 13F AFYA LTD- COM G01767105 221,294 12,955 6,238 0.0004
2023-02-14 2022-12-31 13F ALKERMES COM G01767105 208,339 -199,271 -48.89 5,445 -40.18 0.0019
2022-11-14 2022-09-30 13F ALKERMES COM G01767105 407,610 -43,802 -9.70 9,102 -32.32 0.0034
2022-08-15 2022-06-30 13F ALKERMES COM G01767105 451,412 177,350 64.71 13,449 86.51 0.0047
2022-05-16 2022-03-31 13F ALKERMES COM G01767105 274,062 -8,277 -2.93 7,211 9.79 0.0021
2022-02-14 2021-12-31 13F ALKERMES COM G01767105 282,339 176,732 167.35 6,568 101.72 0.0018
2021-11-15 2021-09-30 13F ALKERMES COM G01767105 105,607 3,693 3.62 3,256 30.34 0.0010
2021-08-16 2021-06-30 13F ALKERMES COM G01767105 101,914 1,564 1.56 2,498 33.23 0.0008
2021-05-17 2021-03-31 13F ALKERMES COM G01767105 100,350 -11,084 -9.95 1,875 -15.65 0.0006
2021-02-12 2020-12-31 13F ALKERMES COM G01767105 111,434 -3,616 -3.14 2,223 16.57 0.0008
2020-11-16 2020-09-30 13F ALKERMES COM G01767105 115,050 2,185 1.94 1,907 -12.96 0.0008
2020-08-14 2020-06-30 13F ALKERMES COM G01767105 112,865 -32,700 -22.46 2,191 4.43 0.0009
2020-05-15 2020-03-31 13F ALKERMES COM G01767105 145,565 53,987 58.95 2,098 12.25 0.0011
2020-02-14 2019-12-31 13F ALKERMES COM G01767105 91,578 91,578 1,869 0.0008
2019-11-14 2019-09-30 13F ALKERMES COM G01767105 0 -11,263 -100.00 0 -100.00
2019-08-14 2019-06-30 13F ALKERMES COM G01767105 11,263 -559,407 -98.03 255 -98.78 0.0001
2019-05-15 2019-03-31 13F ALKERMES COM G01767105 570,670 -202,406 -26.18 20,824 -8.72 0.0096
2019-02-14 2018-12-31 13F ALKERMES COM G01767105 773,076 719,199 1,334.89 22,813 895.77 0.0114
2018-11-14 2018-09-30 13F ALKERMES COM G01767105 53,877 -485,301 -90.01 2,291 -89.68 0.0008
2018-08-14 2018-06-30 13F ALKERMES COM G01767105 539,178 -475,196 -46.85 22,191 -62.26 0.0098
2018-05-14 2018-03-31 13F ALKERMES COM G01767105 1,014,374 564,103 125.28 58,795 138.66 0.0266
2018-02-12 2017-12-31 13F ALKERMES COM G01767105 450,271 -93,215 -17.15 24,635 -10.84 0.0112
2017-11-07 2017-09-30 13F ALKERMES COM G01767105 543,486 44,173 8.85 27,631 -4.52 0.0132
2017-08-10 2017-06-30 13F ALKERMES COM G01767105 499,313 45,823 10.10 28,940 9.10 0.0145
2017-05-05 2017-03-31 13F ALKERMES COM G01767105 453,490 -1,170,425 -72.07 26,525 -70.61 0.0137
2017-02-03 2016-12-31 13F ALKERMES COM G01767105 1,623,915 -46,461 -2.78 90,255 14.89 0.0493
2016-11-08 2016-09-30 13F ALKERMES COM G01767105 1,670,376 -11,661 -0.69 78,559 8.07 0.0440
2016-08-08 2016-06-30 13F ALKERMES COM G01767105 1,682,037 -488,103 -22.49 72,690 -2.03 0.0426
2016-05-12 2016-03-31 13F ALKERMES COM G01767105 2,170,140 -1,321,027 -37.84 74,197 -73.23 0.0443
2016-02-11 2015-12-31 13F ALKERMES COM G01767105 3,491,167 333,224 10.55 277,113 49.57 0.1627
2015-11-12 2015-09-30 13F ALKERMES COM G01767105 3,157,943 444,414 16.38 185,271 6.12 0.1147
2015-08-13 2015-06-30 13F ALKERMES COM G01767105 2,713,529 6,771 0.25 174,587 5.79 0.0994
2015-05-14 2015-03-31 13F ALKERMES COM G01767105 2,706,758 1,557,628 135.55 165,029 145.24 0.0947
2015-02-13 2014-12-31 13F ALKERMES COM G01767105 1,149,130 -48,224 -4.03 67,294 31.10 0.0392
2014-11-14 2014-09-30 13F ALKERMES COM G01767105 1,197,354 356,717 42.43 51,331 21.32 0.0309
2014-08-13 2014-06-30 13F ALKERMES COM G01767105 840,637 752,301 851.64 42,309 985.96 0.0250
2014-05-14 2014-03-31 13F ALKERMES COM G01767105 88,336 87,336 8,733.60 3,896 9,402.44 0.0023
2014-02-14 2013-12-31 13F ALKERMES COM G01767105 1,000 -537,732 -99.81 41 -99.77 0.0000
2013-11-14 2013-09-30 13F ALKERMES COM G01767105 538,732 -478,784 -47.05 18,112 -37.93 0.0119
2013-08-14 2013-06-30 13F ALKERMES COM G01767105 1,017,516 1,017,516 29,182 0.0202
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.