Sierra Nevada Corporation
Founded in 1963 in Sparks, Nevada (basically a suburb of Reno), Sierra Nevada Corporation didn't win the final round of NASA's recent Commercial Orbital Transportation Services program contest, but it's staying in the program regardless. With NASA's approval but without any extra NASA money (beyond the $20 million it got through the Commercial Crew Development program), it will continue to develop the Dream Chaser spaceplane as a candidate for transportation to and from the International Space Station.
Dream Chaser was originally a project of SpaceDev, which Sierra Nevada acquired in 2008. Its life-support systems will be developed either by Oceaneering International or Paragon Space Development Corporation. Sierra Nevada Corporation is also a subcontractor for Scaled Composites working on the rocket engines for Virgin Galactic's SpaceShipTwo.