3 institutions reported holding $5.4M of FUELCELL ENERGY INC (FCELB) in SEC 13F filings for 2026-03-31. Largest institutional holders: IMC-Chicago, LLC ($2.6M), GROUP ONE TRADING LLC ($1.6M), SIMPLEX TRADING, LLC ($1.3M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | IMC-Chicago, LLC | $2.6M | 394,100 | Added |
| 2 | GROUP ONE TRADING LLC | $1.6M | 243,800 | Trimmed |
| 3 | SIMPLEX TRADING, LLC | $1.3M | 194,900 | Trimmed |
Source: SEC Form 13F filings · as of 2026-03-31