Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ARAY held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | TCW GROUP INC | 15.5M | $4.1M | 0.0% | 13.002% | 0.03% |
| 2 | BlackRock, Inc. | 8.5M | $3.3M | -1.0% | 7.110% | 0.00% |
| 3 | Neuberger Berman Group LLC | 5.9M | $2.3M | +17.9% | 4.922% | 0.00% |
| 4 | ARMISTICE CAPITAL, LLC | 5.6M | $2.2M | +25.2% | 4.738% | 0.06% |
| 5 | WEBER CAPITAL MANAGEMENT LLC /ADV | 5.1M | $2.0M | 0.0% | 4.249% | 1.96% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 4.4M | $1.7M | β | 3.724% | 0.00% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 2.4M | $924K | -3.9% | 2.001% | 0.00% |
| 8 | MACKENZIE FINANCIAL CORP | 2.3M | $911K | +22.3% | 1.972% | 0.00% |
| 9 | RENAISSANCE TECHNOLOGIES LLC | 2.3M | $889K | -6.6% | 1.926% | 0.00% |
| 10 | STATE STREET CORP | 2.0M | $783K | +1.1% | 1.696% | 0.00% |
| 11 | HEARTLAND ADVISORS INC | 2.0M | $767K | -40.6% | 1.662% | 0.04% |
| 12 | DAFNA Capital Management LLC | 1.7M | $652K | +20.4% | 1.413% | 0.15% |
| 13 | SILVERBACK ASSET MANAGEMENT LLC | 1.6M | $640K | +7.7% | 1.387% | 0.13% |
| 14 | UBS Group AG | 1.4M | $544K | +283.5% | 1.178% | 0.00% |
| 15 | FMR LLC | 1.3M | $500K | +21.2% | 1.083% | 0.00% |
| 16 | Parkman Healthcare Partners LLC | 885K | $343K | +3.8% | 0.744% | 0.04% |
| 17 | GOLDMAN SACHS GROUP INC | 862K | $334K | +11.3% | 0.724% | 0.00% |
| 18 | D. E. Shaw & Co., Inc. | 844K | $327K | -49.9% | 0.709% | 0.00% |
| 19 | VANGUARD FIDUCIARY TRUST CO | 765K | $297K | β | 0.643% | 0.00% |
| 20 | Kovack Advisors, Inc. | 738K | $287K | -22.6% | 0.620% | 0.02% |
| 21 | NORTHERN TRUST CORP | 717K | $278K | -5.7% | 0.603% | 0.00% |
| 22 | Silverberg Bernstein Capital Management LLC | 656K | $254K | +1.1% | 0.551% | 0.14% |
| 23 | AQR CAPITAL MANAGEMENT LLC | 617K | $240K | +1347.7% | 0.519% | 0.00% |
| 24 | VANGUARD PORTFOLIO MANAGEMENT LLC | 595K | $231K | β | 0.500% | 0.00% |
| 25 | Squarepoint Ops LLC | 547K | $212K | β | 0.460% | 0.00% |
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 ARAY β a direct measure of their conviction.
Filings activity in ARAY during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new ARAY position in Q1 2026
Institutions that fully closed their ARAY 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 | 123 | +0.0% | 67.12% | 80.86 pp | $27M | 55% |
| Q4 2025 | 123 | 2.4% | 147.98% | 52.01 pp | $60M | 40% |
| Q3 2025 | 126 | +0.0% | 199.99% | +0.00 pp | $100M | +7.9% |
| Q2 2025 | 126 | 2.3% | 199.99% | +0.00 pp | $93M | 8.2% |
| Q1 2025 | 129 | 1.5% | 199.99% | +0.00 pp | $101M | 4.9% |
| Q4 2024 | 131 | +4.0% | 199.99% | +0.00 pp | $107M | +9.7% |
| Q3 2024 | 126 | +8.6% | 199.99% | +0.00 pp | $97M | 4.7% |
| Q2 2024 | 116 | β | 199.99% | β | $102M | 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 ARAY stock.
Based on Q1 2026 13F filings, institutional ownership of Accuray Incorporated stands at 67.1%, held across 123 reporting institutions.
TCW GROUP INC is the largest reported institutional holder of ARAY, with approximately 15,467,952 shares worth $0.00B as of Q1 2026.
Yes β 1 widely-followed marquee investor appear among the top 25 institutional holders of ARAY, including RENAISSANCE TECHNOLOGIES LLC.
Our composite Smart Money Score for ARAY is 39 out of 100 (Bearish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
31 institutions opened new positions in ARAY during Q1 2026, while 31 fully exited. 13 added to existing positions and 77 trimmed.
ARAY institutional ownership fell by 80.86 percentage points quarter-over-quarter, with a net change of +0 holders.
The top 10 institutions account for 69.7% of all reported 13F value in ARAY, and the top 25 account for 91.4%.
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.
Accuray Incorporated (ARAY) Institutional Ownership