Shares of FuelCell Energy Inc. sank 7.1% in premarket trading Thursday, after the maker of fuel cell technology platforms reported a wider-than-expected fiscal second-quarter loss as revenue surprisingly declined and the company continued to increase investment into research and development. For the quarter ending April 30, the net loss was $19.7 million, or 6 cents a share, after a loss of $15.6 million, or 7 cents a share, in the year-ago period. The FactSet consensus was for a per-share loss
