Among the earnings stories for Thursday, May 13, from AP Financial News: â¿¿ American Superconductor Corp., which makes equipment for power generators and utilities, said earnings nearly quadrupled from last year and beat analyst expectations. â¿¿ ADA-ES Inc., which develops technology to make coal mining cleaner and more efficient, said its loss widened to $2.8 million in the first quarter as sales of carbon injection systems dropped and the company fought a lawsuit. â¿¿ Biotechnology company Inhibitex Inc. reported a larger loss for the first quarter than it had a year ago as it spent more money on drug development. â¿¿ Canadian sportswear company Gildan Activewear Inc., said second-quarter net income rose sharply as the company's revenue jumped and costs of cotton and energy fell. â¿¿ Prestige Brands Holdings Inc. returned to a fiscal fourth-quarter profit, benefiting from lower charges and expenses and better revenue.