0000886128 2026-05-19 2026-05-19 0000886128 false 8-K 2026-05-19 FUELCELL ENERGY, INC. DE 1-14204 06-0853042 3 Great Pasture Road Danbury CT 06810 203 825-6000 false false false false Common Stock, $0.0001 par value per share FCEL NASDAQ false