Who owns Alkermes (ALKS)
Which tracked institutional funds hold ALKS, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ALKS company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
179 tracked funds added or opened ALKS while 79 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
ALKS’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes ALKS more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in ALKS divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 390 tracked filers holding ALKS, 223 increased or opened the position and 205 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in ALKS between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 28
- ADAGE CAPITAL PARTNERS GP, L.L.C.$72M
- SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC$50M
- FRONTIER CAPITAL MANAGEMENT CO LLC$35M
- Artia Global Partners LP$24M
- MILLENNIUM MANAGEMENT LLC$17M
- Aberdeen Group plc$10M
Full exits 48
- Avoro Capital Advisors LLC$42M
- T. Rowe Price Investment Management, Inc.$32M
- Logos Global Management LP$12M
- C WorldWide Group Holding A/S$9M
- S&CO INC$9M
- ACADIAN ASSET MANAGEMENT LLC$8M
Largest adds
- BlackRock, Inc.$679M
- PRICE T ROWE ASSOCIATES INC /MD/$188M
- BAKER BROS. ADVISORS LP$171M
- VANGUARD PORTFOLIO MANAGEMENT LLC$161M
- STATE STREET CORP$145M
- VANGUARD CAPITAL MANAGEMENT LLC$131M
Largest trims
- JPMORGAN CHASE & CO$109M
- Soleus Capital Management, L.P.$16M
- Man Group plc$16M
- UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC$14M
- BALYASNY ASSET MANAGEMENT L.P.$13M
- SILVERARC CAPITAL MANAGEMENT, LLC$10M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 29,235,739 | $1.5B | 17.4% | 2026-Q2 |
| BAKER BROS. ADVISORS LP | 10,012,267 | $525M | 5.9% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 9,490,818 | $497M | 5.6% | 2026-Q2 |
| STATE STREET CORP trimmed | 9,160,575 | $480M | 5.4% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 7,515,025 | $394M | 4.5% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 6,737,328 | $353M | 4.0% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 6,460,928 | $339M | 3.8% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 4,477,876 | $235M | 2.7% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 4,194,873 | $220M | 2.5% | 2026-Q2 |
| Deep Track Capital, LP added | 4,000,000 | $210M | 2.4% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC trimmed | 3,954,239 | $207M | 2.3% | 2026-Q2 |
| Holocene Advisors, LP added | 3,601,472 | $189M | 2.1% | 2026-Q2 |
| Commodore Capital LP trimmed | 3,000,000 | $157M | 1.8% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 2,814,804 | $147M | 1.7% | 2026-Q2 |
| PRIMECAP MANAGEMENT CO/CA/ trimmed | 2,528,680 | $132M | 1.5% | 2026-Q2 |
| FIRST TRUST ADVISORS LP trimmed | 2,421,016 | $127M | 1.4% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 2,335,117 | $122M | 1.4% | 2026-Q2 |
| Nuveen, LLC trimmed | 2,324,197 | $122M | 1.4% | 2026-Q2 |
| NORGES BANK added | 2,156,814 | $113M | 1.3% | 2026-Q2 |
| BVF INC/IL added | 2,154,704 | $113M | 1.3% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 2,023,984 | $106M | 1.2% | 2026-Q2 |
| Bain Capital Life Sciences Investors, LLC added | 1,937,938 | $102M | 1.2% | 2026-Q2 |
| NORTHERN TRUST CORP added | 1,831,619 | $96M | 1.1% | 2026-Q2 |
| MORGAN STANLEY added | 1,751,882 | $92M | 1.0% | 2026-Q2 |
| RTW INVESTMENTS, LP | 1,672,356 | $88M | 1.0% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 1,645,101 | $86M | 1.0% | 2026-Q2 |
| LOOMIS SAYLES & CO L P trimmed | 1,585,518 | $83M | 0.9% | 2026-Q2 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. new | 1,368,000 | $72M | 0.8% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 1,312,031 | $69M | 0.8% | 2026-Q2 |
| Driehaus Capital Management LLC added | 1,238,809 | $65M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 1,177,945 | $62M | 0.7% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 1,170,242 | $61M | 0.7% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 1,159,216 | $61M | 0.7% | 2026-Q2 |
| FMR LLC trimmed | 1,134,410 | $59M | 0.7% | 2026-Q2 |
| Affinity Asset Advisors, LLC trimmed | 1,125,000 | $59M | 0.7% | 2026-Q2 |
| Bank of New York Mellon Corp added | 1,097,282 | $57M | 0.7% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 1,038,311 | $54M | 0.6% | 2026-Q2 |
| Soleus Capital Management, L.P. trimmed | 1,029,252 | $54M | 0.6% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 983,822 | $52M | 0.6% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 969,954 | $51M | 0.6% | 2026-Q2 |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC new | 950,234 | $50M | 0.6% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 918,303 | $48M | 0.5% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC added | 916,709 | $48M | 0.5% | 2026-Q2 |
| Pictet Asset Management Holding SA trimmed | 838,026 | $44M | 0.5% | 2026-Q2 |
| Artisan Partners Limited Partnership trimmed | 831,006 | $44M | 0.5% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC trimmed | 765,543 | $40M | 0.5% | 2026-Q2 |
| Frazier Life Sciences Management, L.P. | 700,647 | $37M | 0.4% | 2026-Q2 |
| Public Sector Pension Investment Board | 677,405 | $35M | 0.4% | 2026-Q2 |
| FRONTIER CAPITAL MANAGEMENT CO LLC new | 659,562 | $35M | 0.4% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 655,140 | $34M | 0.4% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 630,325 | $33M | 0.4% | 2026-Q2 |
| Woodline Partners LP added | 560,282 | $29M | 0.3% | 2026-Q2 |
| Spruce Street Capital LP added | 543,876 | $28M | 0.3% | 2026-Q2 |
| MetLife Investment Management, LLC added | 512,924 | $27M | 0.3% | 2026-Q2 |
| SEGALL BRYANT & HAMILL, LLC trimmed | 498,222 | $26M | 0.3% | 2026-Q2 |
| Artia Global Partners LP new | 448,964 | $24M | 0.3% | 2026-Q2 |
| Invesco Ltd. added | 443,107 | $23M | 0.3% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 422,761 | $22M | 0.3% | 2026-Q2 |
| Fisher Asset Management, LLC added | 419,102 | $22M | 0.2% | 2026-Q2 |
| GENDELL JEFFREY L added | 395,882 | $21M | 0.2% | 2026-Q2 |
| Prosight Management, LP trimmed | 394,389 | $21M | 0.2% | 2026-Q2 |
| Legal & General Group Plc added | 393,524 | $21M | 0.2% | 2026-Q2 |
| RICE HALL JAMES & ASSOCIATES, LLC added | 390,866 | $20M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 387,999 | $20M | 0.2% | 2026-Q2 |
| GLENMEDE TRUST CO NA trimmed | 361,184 | $19M | 0.2% | 2026-Q2 |
| California Public Employees Retirement System added | 347,246 | $18M | 0.2% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 337,043 | $18M | 0.2% | 2026-Q2 |
| Ensign Peak Advisors, Inc added | 335,208 | $18M | 0.2% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 319,595 | $17M | 0.2% | 2026-Q2 |
| Swiss National Bank added | 316,900 | $17M | 0.2% | 2026-Q2 |
| UBS Group AG trimmed | 300,350 | $16M | 0.2% | 2026-Q2 |
| Eagle Health Investments LP added | 297,302 | $16M | 0.2% | 2026-Q2 |
| Senator Investment Group LP added | 275,000 | $14M | 0.2% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 262,721 | $14M | 0.2% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC added | 260,208 | $14M | 0.2% | 2026-Q2 |
| STEMPOINT CAPITAL LP added | 248,015 | $13M | 0.1% | 2026-Q2 |
| Palo Alto Investors LP | 242,560 | $13M | 0.1% | 2026-Q2 |
| PEREGRINE CAPITAL MANAGEMENT LLC trimmed | 232,255 | $12M | 0.1% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 222,624 | $12M | 0.1% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 221,589 | $12M | 0.1% | 2026-Q2 |
| BARCLAYS PLC added | 219,935 | $12M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 217,917 | $8M | 0.1% | 2026-Q2 |
| Atle Fund Management AB trimmed | 213,329 | $11M | 0.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 212,968 | $11M | 0.1% | 2026-Q2 |
| Rock Springs Capital Management LP added | 199,811 | $10M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 199,433 | $10M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 197,412 | $10M | 0.1% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC added | 195,174 | $10M | 0.1% | 2026-Q2 |
| Aberdeen Group plc added | 193,805 | $10M | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 191,316 | $10M | 0.1% | 2026-Q2 |
| Tetragon Partners GP Ltd added | 189,979 | $10M | 0.1% | 2026-Q2 |
| Rhenman & Partners Asset Management AB added | 185,250 | $10M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 184,901 | $10M | 0.1% | 2026-Q2 |
| HighVista Strategies LLC added | 179,256 | $9M | 0.1% | 2026-Q2 |
| MARTINGALE ASSET MANAGEMENT L P trimmed | 170,004 | $9M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 157,759 | $8M | 0.1% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 142,366 | $7M | 0.1% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 141,362 | $7M | 0.1% | 2026-Q2 |
| Cinctive Capital Management LP new | 138,603 | $7M | 0.1% | 2026-Q2 |
| Creative Planning added | 135,159 | $7M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.