 Shares of FuelCell Energy Inc. FCEL, -4.24 sank 9.1 in premarket trading Thursday, after the maker of fuel cell technology platforms reported a wider-than-expected fiscal second-quarter loss and revenue that was about half what was expected. Net losses for the quarter to April 30 widened to 31.0 million, or 8 cents a share, from 19.7 million, or 6 cents a share, in the year-ago period. 