6 institutions reported holding $108.2M of FUELCELL ENERGY INC (FCELB) in SEC 13F filings for 2026-06-30. Largest institutional holders: IMC-Chicago, LLC ($55.3M), GROUP ONE TRADING LLC ($31.1M), SIMPLEX TRADING, LLC ($16.8M), HRT FINANCIAL LP ($3.4M), Sender Co & Partners, Inc. ($1.6M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | IMC-Chicago, LLC | $55.3M | 1.5M | Added |
| 2 | GROUP ONE TRADING LLC | $31.1M | 862,800 | Added |
| 3 | SIMPLEX TRADING, LLC | $16.8M | 467,900 | Added |
| 4 | HRT FINANCIAL LP | $3.4M | 93,697 | New |
| 5 | Sender Co & Partners, Inc. | $1.6M | 45,000 | New |
| 6 | OSAIC HOLDINGS, INC. | $2,360 | 4 | New |
Source: SEC Form 13F filings · as of 2026-06-30