X0609 4 2026-04-08 0000886128 FUELCELL ENERGY INC FCEL 0001878855 Sims Wilson Donna false C/O FUELCELL ENERGY, INC. 3 GREAT PASTURE ROAD DANBURY CT 06810 true false false false false Deferred Common Stock Units 2026-04-08 4 A false 17424 0 A Common Stock 17424 46724 D Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director. /s/ Michael S. Bishop, As Power of Attorney 2026-04-10