6 institutions reported holding $118.7M of OUSTER INC (OUST.WS) in SEC 13F filings for 2026-06-30. Largest institutional holders: IMC-Chicago, LLC ($71.5M), GROUP ONE TRADING LLC ($33.0M), SIMPLEX TRADING, LLC ($13.8M), HRT FINANCIAL LP ($337,000), JPMORGAN CHASE & CO ($86,512). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | IMC-Chicago, LLC | $71.5M | 1.1M | Added |
| 2 | GROUP ONE TRADING LLC | $33.0M | 527,300 | Added |
| 3 | SIMPLEX TRADING, LLC | $13.8M | 220,000 | Added |
| 4 | HRT FINANCIAL LP | $337,000 | 5,400 | Trimmed |
| 5 | JPMORGAN CHASE & CO | $86,512 | 1,600 | Hold |
| 6 | RMG Wealth Management LLC | $4,612 | 100 | New |
Source: SEC Form 13F filings · as of 2026-06-30