20 institutions reported holding $316.7M of PROSHARES TR (SLON) in SEC 13F filings for 2026-06-30. Largest institutional holders: IMC-Chicago, LLC ($152.9M), SIMPLEX TRADING, LLC ($88.7M), GROUP ONE TRADING LLC ($34.3M), JPMORGAN CHASE & CO ($19.1M), HRT FINANCIAL LP ($18.7M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | IMC-Chicago, LLC | $152.9M | 4.2M | Added |
| 2 | SIMPLEX TRADING, LLC | $88.7M | 2.2M | Added |
| 3 | GROUP ONE TRADING LLC | $34.3M | 884,822 | Trimmed |
| 4 | JPMORGAN CHASE & CO | $19.1M | 500,000 | New |
| 5 | HRT FINANCIAL LP | $18.7M | 514,200 | Trimmed |
| 6 | FLOW TRADERS U.S. LLC | $1.3M | 73,300 | Trimmed |
| 7 | Astra Wealth Partners LLC | $428,458 | 11,800 | New |
| 8 | Optiver Holding B.V. | $395,779 | 10,900 | Added |
| 9 | Belvedere Trading LLC | $381,575 | 21,366 | New |
| 10 | Miracle Mile Advisors, LLC | $217,860 | 0 | New |
| 11 | Avidian Wealth Enterprises, LLC | $182,380 | 10,212 | Trimmed |
| 12 | Tower Research Capital LLC (TRC) | $679 | 38 | Trimmed |
| 13 | HOLLENCREST CAPITAL MANAGEMENT | $393 | 22 | Trimmed |
| 14 | CITADEL ADVISORS LLC | $0 | 0 | Exited |
| 15 | JANE STREET GROUP, LLC | $0 | 0 | Exited |
| 16 | UBS Group AG | $0 | 0 | Exited |
| 17 | OSAIC HOLDINGS, INC. | $0 | 0 | Exited |
| 18 | Caitlin John, LLC | $0 | 0 | Exited |
| 19 | Ankerstar Wealth, LLC | $0 | 0 | Exited |
| 20 | Miller Capital Partners, Inc. | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30