Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ALKS held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 28.3M | $1.00B | +0.1% | 16.988% | 0.02% |
| 2 | BAKER BROS. ADVISORS LP | 10.0M | $354.0M | 0.0% | 6.007% | 2.03% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 9.5M | $336.3M | β | 5.706% | 0.02% |
| 4 | STATE STREET CORP | 9.5M | $334.7M | -0.1% | 5.679% | 0.01% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 7.4M | $262.6M | β | 4.456% | 0.01% |
| 6 | RENAISSANCE TECHNOLOGIES LLC | 6.2M | $217.8M | -7.6% | 3.696% | 0.34% |
| 7 | AMERICAN CENTURY COMPANIES INC | 6.1M | $214.7M | +1.9% | 3.643% | 0.11% |
| 8 | DIMENSIONAL FUND ADVISORS LP | 4.5M | $159.9M | +2.5% | 2.713% | 0.03% |
| 9 | COMMODORE CAPITAL LP | 4.2M | $148.5M | +18.3% | 2.520% | 8.59% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 4.2M | $147.9M | +2.5% | 2.509% | 0.01% |
| 11 | Deep Track Capital, LP | 3.6M | $127.0M | +79.5% | 2.154% | 2.62% |
| 12 | WELLINGTON MANAGEMENT GROUP LLP | 3.0M | $105.0M | -1.7% | 1.782% | 0.02% |
| 13 | FIRST TRUST ADVISORS LP | 3.0M | $105.0M | +104.2% | 1.781% | 0.08% |
| 14 | PRIMECAP MANAGEMENT CO/CA/ | 2.5M | $89.8M | -0.9% | 1.524% | 0.07% |
| 15 | Nuveen, LLC | 2.5M | $87.0M | +1.4% | 1.476% | 0.02% |
| 16 | CITADEL ADVISORS LLC | 2.3M | $82.4M | +79.0% | 1.399% | 0.04% |
| 17 | Holocene Advisors, LP | 2.3M | $81.9M | β | 1.390% | 0.20% |
| 18 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 2.2M | $79.1M | +3.9% | 1.342% | 0.01% |
| 19 | BVF INC/IL | 2.0M | $70.7M | β | 1.200% | 2.25% |
| 20 | Soleus Capital Management, L.P. | 2.0M | $69.7M | +49.0% | 1.183% | 2.82% |
| 21 | GOLDMAN SACHS GROUP INC | 1.9M | $66.6M | -17.0% | 1.129% | 0.01% |
| 22 | LOOMIS SAYLES & CO L P | 1.8M | $63.1M | -6.2% | 1.071% | 0.08% |
| 23 | MORGAN STANLEY | 1.7M | $61.4M | -8.1% | 1.042% | 0.00% |
| 24 | NORTHERN TRUST CORP | 1.7M | $60.0M | +2.6% | 1.018% | 0.01% |
| 25 | RTW INVESTMENTS, LP | 1.7M | $59.1M | 0.0% | 1.003% | 0.59% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in ALKS β a direct measure of their conviction.
Filings activity in ALKS during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new ALKS position in Q1 2026
Institutions that fully closed their ALKS position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 374 | +3.9% | 78.28% | +14.58 pp | $5.78B | +23% |
| Q4 2025 | 360 | +4.7% | 63.70% | 0.25 pp | $4.70B | 0.4% |
| Q3 2025 | 344 | 0.6% | 63.95% | +3.03 pp | $4.72B | +5.0% |
| Q2 2025 | 346 | 3.9% | 60.92% | 6.43 pp | $4.50B | 9.5% |
| Q1 2025 | 360 | +6.8% | 67.35% | +9.60 pp | $4.97B | +17% |
| Q4 2024 | 337 | +1.8% | 57.75% | 2.32 pp | $4.26B | 3.9% |
| Q3 2024 | 331 | +4.7% | 60.07% | +6.18 pp | $4.43B | +11% |
| Q2 2024 | 316 | β | 53.89% | β | $3.98B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ALKS stock.
Based on Q1 2026 13F filings, institutional ownership of Alkermes plc stands at 78.3%, held across 374 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of ALKS, with approximately 28,314,410 shares worth $1.00B as of Q1 2026.
Yes β 2 widely-followed marquee investors appear among the top 25 institutional holders of ALKS, including RENAISSANCE TECHNOLOGIES LLC, CITADEL ADVISORS LLC.
Our composite Smart Money Score for ALKS is 67 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
72 institutions opened new positions in ALKS during Q1 2026, while 58 fully exited. 237 added to existing positions and 63 trimmed.
ALKS institutional ownership rose by 14.58 percentage points quarter-over-quarter, with a net change of +14 holders.
The top 10 institutions account for 55.0% of all reported 13F value in ALKS, and the top 25 account for 75.9%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Alkermes plc (ALKS) Institutional Ownership