Ranked by reported Q2 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. | 29.2M | $1.53B | +3.3% | 17.427% | 0.02% |
| 2 | BAKER BROS. ADVISORS LP | 10.0M | $524.6M | 0.0% | 5.968% | 2.63% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 9.5M | $497.3M | -0.2% | 5.657% | 0.02% |
| 4 | STATE STREET CORP | 9.2M | $480.0M | -3.2% | 5.460% | 0.01% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 7.5M | $393.7M | +1.2% | 4.479% | 0.01% |
| 6 | RENAISSANCE TECHNOLOGIES LLC | 6.5M | $338.5M | +4.9% | 3.851% | 0.47% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 4.5M | $234.7M | +7.1% | 2.669% | 0.01% |
| 8 | DIMENSIONAL FUND ADVISORS LP | 4.2M | $219.8M | -7.2% | 2.500% | 0.04% |
| 9 | Deep Track Capital, LP | 4.0M | $209.6M | +11.4% | 2.384% | 3.05% |
| 10 | AMERICAN CENTURY COMPANIES INC | 4.0M | $207.2M | -34.9% | 2.357% | 0.09% |
| 11 | Holocene Advisors, LP | 4.0M | $207.0M | +70.5% | 2.355% | 0.47% |
| 12 | Commodore Capital LP | 3.0M | $157.2M | -28.6% | 1.788% | 9.36% |
| 13 | WELLINGTON MANAGEMENT GROUP LLP | 2.8M | $147.5M | -5.2% | 1.678% | 0.03% |
| 14 | PRIMECAP MANAGEMENT CO/CA/ | 2.5M | $132.5M | -0.4% | 1.507% | 0.08% |
| 15 | FIRST TRUST ADVISORS LP | 2.4M | $126.8M | -18.4% | 1.443% | 0.07% |
| 16 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 2.3M | $122.3M | +4.4% | 1.392% | 0.02% |
| 17 | Nuveen, LLC | 2.3M | $121.8M | -5.5% | 1.385% | 0.03% |
| 18 | NORGES BANK | 2.2M | $113.0M | — | 1.286% | 0.01% |
| 19 | BVF INC/IL | 2.2M | $112.9M | +7.7% | 1.284% | 2.89% |
| 20 | GOLDMAN SACHS GROUP INC | 2.0M | $106.0M | +7.5% | 1.206% | 0.01% |
| 21 | Bain Capital Life Sciences Investors, LLC | 1.9M | $101.5M | +217.7% | 1.155% | 6.04% |
| 22 | CITADEL ADVISORS LLC | 1.9M | $99.1M | -18.9% | 1.128% | 0.01% |
| 23 | NORTHERN TRUST CORP | 1.8M | $96.0M | +7.9% | 1.092% | 0.01% |
| 24 | MORGAN STANLEY | 1.8M | $91.8M | +0.9% | 1.044% | 0.00% |
| 25 | RTW INVESTMENTS, LP | 1.7M | $87.6M | 0.0% | 0.997% | 0.75% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in ALKS — a direct measure of their conviction.
Filings activity in ALKS during Q2 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 423 | +10% | 106.95% | +1.24 pp | $8.91B | +51% |
| Q1 2026 | 383 | +6.1% | 105.71% | 3.04 pp | $5.92B | +25% |
| Q4 2025 | 361 | +3.7% | 108.75% | +5.56 pp | $4.73B | 0.0% |
| Q3 2025 | 348 | +0.6% | 103.19% | +0.13 pp | $4.73B | +5.3% |
| Q2 2025 | 346 | 3.9% | 103.06% | +0.89 pp | $4.50B | 9.5% |
| Q1 2025 | 360 | +6.8% | 102.17% | 0.80 pp | $4.97B | +17% |
| Q4 2024 | 337 | +1.8% | 102.97% | 6.02 pp | $4.26B | 3.9% |
| Q3 2024 | 331 | — | 108.99% | — | $4.43B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ALKS stock.
Based on Q2 2026 13F filings, institutional ownership of Alkermes plc stands at 106.9%, held across 423 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of ALKS, with approximately 29,235,739 shares worth $1.53B as of Q2 2026.
Yes — 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 73 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
85 institutions opened new positions in ALKS during Q2 2026, while 48 fully exited. 278 added to existing positions and 48 trimmed.
ALKS institutional ownership rose by 1.24 percentage points quarter-over-quarter, with a net change of +40 holders.
The top 10 institutions account for 52.0% of all reported 13F value in ALKS, and the top 25 account for 72.5%.
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