| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 16% | $737,618,983 | 25,638,477 | BlackRock, Inc. | 31 Mar 2025 | |||
| PRICE T ROWE ASSOCIATES INC /MD/ | 6.1% | $291,215,100 | 10,041,900 | T. Rowe Price Associates, Inc. | 30 Jun 2025 | |||
| BAKER BROS. ADVISORS LP | 6.1% | $280,143,231 | 10,012,267 | Baker Bros. Advisors LP | 31 Dec 2025 | |||
| STATE STREET CORP | 5.2% | +6% | $256,210,530 | +$15,530,430 | 8,540,351 | +6.5% | STATE STREET CORPORATION | 30 Sep 2025 |
| WELLINGTON MANAGEMENT GROUP LLP | 4.3% | $201,749,136 | 7,012,483 | Wellington Management Group LLP | 31 Dec 2024 |
As of 31 Dec 2025, 360 institutional investors reported holding 180,294,000 shares of Alkermes plc. - Ordinary Shares, $0.01 per share (ALKS). This represents 110% of the company’s total 164,135,525 outstanding shares.
The largest institutional shareholders of Alkermes plc. - Ordinary Shares, $0.01 per share (ALKS) together control 81% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 17% | 28,272,412 | +1.1% | 0.01% | $791,062,090 |
| VANGUARD GROUP INC | 11% | 18,007,364 | -0.95% | 0.01% | $503,846,044 |
| BAKER BROS. ADVISORS LP | 6.1% | 10,012,267 | +24% | 1.6% | $280,143,231 |
| STATE STREET CORP | 5.8% | 9,472,858 | +11% | 0.01% | $265,050,567 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 5.5% | 8,998,963 | -12% | 0.03% | $251,792,000 |
| RENAISSANCE TECHNOLOGIES LLC | 4.1% | 6,668,028 | +6% | 0.29% | $186,571,423 |
| AMERICAN CENTURY COMPANIES INC | 3.6% | 5,956,824 | +35% | 0.08% | $166,671,997 |
| JPMORGAN CHASE & CO | 3.2% | 5,184,547 | +32% | 0.01% | $145,063,637 |
| DIMENSIONAL FUND ADVISORS LP | 2.7% | 4,412,783 | +19% | 0.03% | $123,466,744 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.5% | 4,080,776 | +0.48% | 0.01% | $114,198,472 |
| Commodore Capital LP | 2.2% | 3,550,000 | +15% | 6.6% | $99,329,000 |
| WELLINGTON MANAGEMENT GROUP LLP | 1.8% | 3,020,442 | +705% | 0.01% | $84,511,968 |
| PRIMECAP MANAGEMENT CO/CA/ | 1.6% | 2,564,300 | -7.1% | 0.05% | $71,749,112 |
| UBS Group AG | 1.6% | 2,544,895 | +237% | 0.01% | $71,206,162 |
| Nuveen, LLC | 1.5% | 2,427,028 | +12% | 0.02% | $67,908,244 |
| GOLDMAN SACHS GROUP INC | 1.4% | 2,267,588 | +14% | 0.01% | $63,447,113 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.3% | 2,152,756 | +0.58% | 0.01% | $60,234,113 |
| Deep Track Capital, LP | 1.2% | 2,000,000 | 1.3% | $55,960,000 | |
| NORGES BANK | 1.2% | 1,945,734 | 0.01% | $54,441,637 | |
| LOOMIS SAYLES & CO L P | 1.2% | 1,902,522 | -7.1% | 0.06% | $53,232,566 |
| MORGAN STANLEY | 1.2% | 1,888,487 | +22% | 0% | $52,839,910 |
| RTW INVESTMENTS, LP | 1% | 1,672,356 | 0% | 0.47% | $46,792,521 |
| NORTHERN TRUST CORP | 1% | 1,653,475 | -6.4% | 0.01% | $46,264,230 |
| Pictet Asset Management Holding SA | 0.9% | 1,477,214 | +65% | 0.04% | $41,343,880 |
| FIRST TRUST ADVISORS LP | 0.89% | 1,454,002 | +4% | 0.03% | $40,682,975 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 180,294,000 | $5,045,718,081 | +$291,833,260 | $27.98 | 360 |
| 2025 Q3 | 169,341,595 | $5,079,979,539 | +$18,878,009 | $30.00 | 352 |
| 2025 Q2 | 169,266,778 | $4,842,815,839 | -$75,320,709 | $28.61 | 349 |
| 2025 Q1 | 170,391,411 | $5,625,587,430 | +$100,126,633 | $33.02 | 368 |
| 2024 Q4 | 167,229,553 | $4,809,633,445 | -$340,228,488 | $28.76 | 339 |
| 2024 Q3 | 178,773,963 | $5,003,514,490 | +$17,540,017 | $27.99 | 333 |
| 2024 Q2 | 179,320,535 | $4,321,913,080 | +$60,416,487 | $24.10 | 317 |
| 2024 Q1 | 176,001,012 | $4,763,281,654 | +$15,935,209 | $27.07 | 330 |
| 2023 Q4 | 175,467,711 | $4,867,418,321 | +$343,345,772 | $27.74 | 297 |
| 2023 Q3 | 163,842,866 | $4,589,236,432 | +$56,577,822 | $28.01 | 304 |
| 2023 Q2 | 160,680,217 | $5,027,116,770 | -$5,814,531 | $31.30 | 288 |
| 2023 Q1 | 161,604,443 | $4,555,535,684 | -$5,594,505 | $28.19 | 263 |
| 2022 Q4 | 162,372,542 | $4,242,746,855 | +$91,252,041 | $26.13 | 273 |
| 2022 Q3 | 159,945,390 | $3,571,769,628 | -$80,096,583 | $22.33 | 264 |
| 2022 Q2 | 156,870,253 | $4,672,860,939 | -$21,124,857 | $29.79 | 262 |
| 2022 Q1 | 157,878,224 | $4,153,400,239 | +$53,403,811 | $26.31 | 231 |
| 2021 Q4 | 156,147,340 | $3,631,040,518 | +$68,229,141 | $23.26 | 203 |
| 2021 Q3 | 152,381,294 | $4,699,818,812 | -$238,782,318 | $30.84 | 218 |
| 2021 Q2 | 161,105,829 | $3,950,984,222 | +$103,219,618 | $24.52 | 213 |
| 2021 Q1 | 157,785,504 | $2,947,852,619 | -$61,698,231 | $18.68 | 187 |
| 2020 Q4 | 161,429,176 | $3,221,459,094 | +$68,763,873 | $19.95 | 199 |
| 2020 Q3 | 164,899,645 | $2,732,070,918 | -$28,388,739 | $16.57 | 172 |
| 2020 Q2 | 159,475,358 | $3,094,659,758 | +$117,571,354 | $19.40 | 158 |
| 2020 Q1 | 155,925,157 | $2,245,904,814 | +$53,123,914 | $14.42 | 180 |
| 2019 Q4 | 150,944,409 | $3,073,788,187 | +$423,384 | $20.40 | 203 |
| 2019 Q3 | 150,569,586 | $2,936,273,390 | -$33,652,784 | $19.51 | 195 |
| 2019 Q2 | 151,862,128 | $3,422,077,720 | -$92,876,895 | $22.54 | 213 |
| 2019 Q1 | 153,784,455 | $5,610,048,691 | +$11,066,860 | $36.49 | 208 |
| 2018 Q4 | 153,616,325 | $4,532,644,691 | -$144,802,272 | $29.51 | 217 |
| 2018 Q3 | 157,824,160 | $6,698,150,487 | -$24,630,564 | $42.44 | 251 |
| 2018 Q2 | 158,411,445 | $6,519,905,291 | -$85,276,877 | $41.16 | 234 |
| 2018 Q1 | 159,900,599 | $9,267,172,984 | -$54,117,628 | $57.96 | 260 |
| 2017 Q4 | 161,375,962 | $8,831,086,069 | +$455,579,024 | $54.73 | 241 |
| 2017 Q3 | 153,133,133 | $7,785,371,541 | +$37,756,506 | $50.84 | 238 |
| 2017 Q2 | 152,058,450 | $8,814,804,310 | +$242,074,699 | $57.97 | 251 |
| 2017 Q1 | 149,415,077 | $8,740,882,725 | +$690,583,280 | $58.50 | 256 |
| 2016 Q4 | 147,490,758 | $8,196,995,490 | +$131,757,071 | $55.58 | 261 |
| 2016 Q3 | 145,304,666 | $6,831,906,777 | +$27,462,812 | $47.03 | 249 |
| 2016 Q2 | 144,840,494 | $6,260,859,620 | -$11,196,936 | $43.22 | 239 |
| 2016 Q1 | 145,549,048 | $4,976,133,428 | -$210,080,821 | $34.19 | 228 |
| 2015 Q4 | 142,660,735 | $11,324,045,961 | -$438,127,760 | $79.38 | 283 |
| 2015 Q3 | 148,061,579 | $8,686,183,862 | +$2,938,518 | $58.67 | 261 |
| 2015 Q2 | 148,099,245 | $9,528,260,933 | +$184,513,519 | $64.34 | 263 |
| 2015 Q1 | 145,257,546 | $8,859,048,188 | +$54,084,622 | $60.97 | 258 |
| 2014 Q4 | 144,084,184 | $8,446,969,957 | +$76,426,626 | $58.56 | 215 |
| 2014 Q3 | 141,202,533 | $6,053,733,496 | -$10,850,475 | $42.87 | 201 |
| 2014 Q2 | 140,989,633 | $7,095,211,445 | +$192,715,103 | $50.33 | 210 |
| 2014 Q1 | 137,511,902 | $6,060,417,616 | +$323,918,751 | $44.09 | 213 |