FuelCell Energy is trading at $12.47, down 5.53%, as broad risk-off sentiment coincided with questions about returns on AI infrastructure spending and escalating Middle East tensions that pushed oil higher. - No clear company-specific negative catalyst surfaced for October 22. - The prior-day announcement that the Block System received a 99.873% PJM capacity rating was positive company news, not an explanation for the decline. - Major indexes were lower, including the Nasdaq, down 2.19%.