A single deal has made a world of difference for Top 150 newcomer Herndon Products. Revenue at the defense contractor soared from $42 million to $75 million last year thanks to a contract, potentially worth up to $277 million over eight years, in support of Letterkenny Army Depot in Chambersburg, Pa. Chief Operating Officer Dan Rodrigues said he does not expect a similar revenue jump in 2010. "You can't hit a home run every time," he said.

O'Fallon, Mo.-based Herndon is a...