Kaiser Group Holdings, Inc. (Kaiser Group Holdings) is a holding company. The Company was formed for the purpose of owning all of the outstanding stock of Kaiser Group International, Inc. (Old Kaiser), which in turn owns the stock of its remaining subsidiaries. Kaiser Group International, Inc. owns the stock of subsidiaries, including ownership in Kaiser Aircraft Industries, Inc., and a stake in Kaiser-Hill Company, LLC. Kaiser Aircraft Industries, Inc. is a provider of aircraft maintenance and modification services primarily to government and military customers. Kaiser-Hill Company, LLC is engaged in serving as the general contractor performing closure activities at the United States Department of Energy's Rocky Flats site near Denver, Colorado. Kaiser-Hill operates under the close-out phase of the Closure Contract, resolving administrative issues and providing support to the department of energy (DOE) to achieve regulatory closure of the Rocky Flats site.