11 institutions reported holding $191.5M of MP MATERIALS CORP (MP.WS) in SEC 13F filings for 2026-03-31. Largest institutional holders: IMC-Chicago, LLC ($90.8M), GROUP ONE TRADING LLC ($51.0M), SIMPLEX TRADING, LLC ($31.8M), JPMORGAN CHASE & CO ($9.1M), HRT FINANCIAL LP ($3.8M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | IMC-Chicago, LLC | $90.8M | 1.9M | Trimmed |
| 2 | GROUP ONE TRADING LLC | $51.0M | 1.1M | Trimmed |
| 3 | SIMPLEX TRADING, LLC | $31.8M | 659,200 | Trimmed |
| 4 | JPMORGAN CHASE & CO | $9.1M | 200,000 | Trimmed |
| 5 | HRT FINANCIAL LP | $3.8M | 78,500 | Added |
| 6 | OnyxPoint Global Management LP | $3.7M | 77,100 | Hold |
| 7 | Thomist Capital Management, LP | $965,200 | 20,000 | New |
| 8 | All Terrain Financial Advisors, LLC | $284,734 | 5,900 | Hold |
| 9 | SG Americas Securities, LLC | $0 | 0 | Exited |
| 10 | K2 PRINCIPAL FUND, L.P. | $0 | 0 | Exited |
| 11 | HITE Hedge Asset Management LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31