11 institutions reported holding $16.3M of OUSTER INC (OUST.WS) in SEC 13F filings for 2026-03-31. Largest institutional holders: IMC-Chicago, LLC ($8.4M), GROUP ONE TRADING LLC ($4.5M), SIMPLEX TRADING, LLC ($2.5M), HRT FINANCIAL LP ($876,000), JPMORGAN CHASE & CO ($26,608). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | IMC-Chicago, LLC | $8.4M | 456,200 | Added |
| 2 | GROUP ONE TRADING LLC | $4.5M | 246,600 | Trimmed |
| 3 | SIMPLEX TRADING, LLC | $2.5M | 135,500 | Trimmed |
| 4 | HRT FINANCIAL LP | $876,000 | 47,700 | Trimmed |
| 5 | JPMORGAN CHASE & CO | $26,608 | 1,600 | New |
| 6 | WOLVERINE ASSET MANAGEMENT LLC | $0 | 0 | Exited |
| 7 | LMR Partners LLP | $0 | 0 | Exited |
| 8 | MILLENNIUM MANAGEMENT LLC | $0 | 0 | Exited |
| 9 | Davidson Kempner Capital Management LP | $0 | 0 | Exited |
| 10 | UBS Group AG | $0 | 0 | Exited |
| 11 | KIM, LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31