Rocketdyne
The Rocketdyne Division was founded by North American Aviation (NAA) in 1955, and was later part of Rockwell International (1967-1996) and Boeing (1996-2005). In 2005, the Rocketdyne Division was sold to United Technologies Corporation, becoming Pratt & Whitney Rocketdyne as part of Pratt & Whitney. In 2013, Pratt & Whitney Rocketdyne was sold to GenCorp, which merged it with Aerojet to form Aerojet Rocketdyne.
Atomics International
The remaining Atomics International business operations were merged into the Rocketdyne division of Rockwell International in 1984 when the Energy Systems Group was ended. Nuclear research programs and operations ceased in 1989 and all non-nuclear research ended in 1998. Rockwell International sold the Rocketdyne division to The Boeing Company in 1996. In 2005, Boeing sold Rocketdyne to United Technologies Corporation who combined it with an existing division and renamed them Pratt & Whitney Rocketdyne. Boeing retained ownership of the Santa Susana Field Laboratory property, including Area IV, with its environmental cleanup responsibilities. The Hamilton Sundstrand division of United Technologies Corporation became the recipient of the remaining technical knowledge from the Atomics International nuclear-related activities.