4 institutions reported holding $14.1M of RUSH STREET INTERACTIVE INC (RSI.WS) in SEC 13F filings for 2026-03-31. Largest institutional holders: SIMPLEX TRADING, LLC ($5.1M), IMC-Chicago, LLC ($4.5M), GROUP ONE TRADING LLC ($3.2M), HRT FINANCIAL LP ($1.3M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | SIMPLEX TRADING, LLC | $5.1M | 233,300 | Added |
| 2 | IMC-Chicago, LLC | $4.5M | 205,300 | Added |
| 3 | GROUP ONE TRADING LLC | $3.2M | 147,500 | Trimmed |
| 4 | HRT FINANCIAL LP | $1.3M | 61,200 | New |
Source: SEC Form 13F filings · as of 2026-03-31