| 0.58% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 2.4M | $5.0M | -0.1% | 3.915% | 0.00% |
| 5 | D. E. Shaw & Co., Inc. | 1.9M | $4.1M | +38.2% | 3.217% | 0.00% |
| 6 | MARSHALL WACE, LLP | 1.5M | $3.2M | +1062.0% | 2.498% | 0.00% |
| 7 | 683 Capital Management, LLC | 1.4M | $3.1M | -3.3% | 2.404% | 0.15% |
| 8 | JANE STREET GROUP, LLC | 1.4M | $3.0M | +22.4% | 2.315% | 0.00% |
| 9 | ARDSLEY ADVISORY PARTNERS LP | 1.3M | $2.7M | +2.0% | 2.114% | 0.28% |
| 10 | BlackRock, Inc. | 1.3M | $2.7M | -66.6% | 2.084% | 0.00% |
| 11 | Qube Research & Technologies Ltd | 1.1M | $2.4M | +1196.3% | 1.871% | 0.00% |
| 12 | RENAISSANCE TECHNOLOGIES LLC | 882K | $1.9M | +2.2% | 1.462% | 0.00% |
| 13 | VANGUARD PORTFOLIO MANAGEMENT LLC | 795K | $1.7M | -1.6% | 1.318% | 0.00% |
| 14 | GOLDMAN SACHS GROUP INC | 725K | $1.5M | +33.6% | 1.203% | 0.00% |
| 15 | JACOBS LEVY EQUITY MANAGEMENT, INC | 647K | $1.4M | -18.8% | 1.072% | 0.00% |
| 16 | MORGAN STANLEY | 608K | $1.3M | +17.3% | 1.008% | 0.00% |
| 17 | GEODE CAPITAL MANAGEMENT, LLC | 596K | $1.3M | -52.4% | 0.988% | 0.00% |
| 18 | CITADEL ADVISORS LLC | 543K | $1.2M | +30.2% | 0.900% | 0.00% |
| 19 | DIMENSIONAL FUND ADVISORS LP | 529K | $1.1M | -15.2% | 0.877% | 0.00% |
| 20 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 421K | $897K | — | 0.698% | 0.00% |
| 21 | MILLENNIUM MANAGEMENT LLC | 360K | $768K | -63.8% | 0.597% | 0.00% |
| 22 | UBS Group AG | 302K | $643K | -43.8% | 0.501% | 0.00% |
| 23 | VANGUARD FIDUCIARY TRUST CO | 298K | $635K | -11.9% | 0.494% | 0.00% |
| 24 | XTX Topco Ltd | 255K | $543K | +238.9% | 0.422% | 0.01% |
| 25 | WOODSTOCK CORP | 243K | $517K | -9.0% | 0.402% | 0.04% |
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 ALDX — a direct measure of their conviction.
| 60.19% |
| 2.21 pp |
| $214M |
| +16% |
| Q4 2024 | 115 | +3.6% | 62.40% | +0.82 pp | $184M | 5.0% |
| Q3 2024 | 111 | — | 61.58% | — | $194M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
18 institutions opened new positions in ALDX during Q2 2026, while 35 fully exited. 65 added to existing positions and 22 trimmed.
ALDX institutional ownership fell by 1.82 percentage points quarter-over-quarter, with a net change of -18 holders.
The top 10 institutions account for 64.9% of all reported 13F value in ALDX, and the top 25 account for 88.3%.
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.
Aldeyra The (ALDX) Institutional Ownership