SpaceDev was founded in 1997.
It was merged into Sierra Nevada Corporation in Dec. 2008.
SpaceDev acquired Integrated Space Systems (USA). For a while, SpaceDev also owned UK-based Space Innovations Limited.In August 1998 SpaceDev acquired all patents, intellectual property, test results, and documents that had been produced by the out of business American Rocket Company (AMROC).
On December 2008 Sierra Nevada Corporation (SNC) acquired the company SpaceDev.
see SNC.