Shares of FuelCell Energy sank Wednesday after the maker of fuel cell power plants reported a wider-than-expected quarterly loss and missed revenue expectations.

The company posted a loss of 64 cents a share in its fiscal third quarter ended July 31, narrowing from a loss of $3.78 a year ago but wider than Wall Street expectations of a loss of 41 cents. Revenue fell 29% to $33 million, missing the analyst consensus call for $38.8 million, according to FactSet.

FuelCell has scored big from the artificial-intelligence boom and the bulk of its commercial pipeline is supported by the demand for AI and data centers.

But investors haven't been enamored with the stock lately and the quarterly results were another reason to sell.

FuelCell stock declined 16% to $14.21 in premarket trading on Wednesday after ending Tuesday down 0.9%. Shares have declined 53% since June 30, as the company announced a $200 million public offering of common stock in early July. The stock, however, remained up 134% on the year as of the closing bell on Tuesday.