14 institutions reported holding $417.8M of ISHARES TR (XWEB) in SEC 13F filings for 2026-06-30. Largest institutional holders: Optiver Holding B.V. ($180.1M), IMC-Chicago, LLC ($134.2M), SIMPLEX TRADING, LLC ($79.3M), GROUP ONE TRADING LLC ($20.7M), JPMORGAN CHASE & CO ($2.3M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | Optiver Holding B.V. | $180.1M | 1.2M | Trimmed |
| 2 | IMC-Chicago, LLC | $134.2M | 881,400 | Trimmed |
| 3 | SIMPLEX TRADING, LLC | $79.3M | 542,200 | Trimmed |
| 4 | GROUP ONE TRADING LLC | $20.7M | 134,900 | Trimmed |
| 5 | JPMORGAN CHASE & CO | $2.3M | 15,000 | Trimmed |
| 6 | Oak Harvest Investment Services | $670,500 | 2,000 | New |
| 7 | Itau Unibanco Holding S.A. | $406,397 | 5,800 | New |
| 8 | Ancora Advisors LLC | $50,292 | 600 | New |
| 9 | Maven Securities LTD | $0 | 0 | Exited |
| 10 | COMPASS ROSE ASSET MANAGEMENT, LP | $0 | 0 | Exited |
| 11 | LuminArx Capital Management LP | $0 | 0 | Exited |
| 12 | RH Tailwind Management, LLC | $0 | 0 | Exited |
| 13 | Phillip James Consulting Co. | $0 | 0 | Exited |
| 14 | HIGHBRIDGE CAPITAL MANAGEMENT LLC | $0 | 0 | Exited |
来源：SEC 13F 申报文件 · 截至 2026-06-30