SIG Sauer is a Swiss brand name of firearms originally manufactured in Neuhausen am Rheinfall. Several sister companies that design and manufacture firearms use the trade name SIG Sauer and it is also registered brand name.
The original company, Schweizerische Waggonfabrik (SWF), later Schweizerische Industrie-Gesellschaft (SIG), went through several selloffs, leaving the SIG Sauer brand spread over several companies. The original SIG is now known as SIG Group and no longer has any firearms business.
The American company is Sig Sauer, Inc (stylized as SIG SAUER). Its predecessor SIGARMS was founded in Virginia in 1985 to import and distribute SIG Sauer firearms into the United States: Its headquarters were moved to New Hampshire in 1990. This company was renamed Sig Sauer, Inc. in 2007, and since 2000 is organizationally separate from SIG Sauer GmbH.
L&O Holding is the parent company of the Swiss SIG Sauer AG and the American Sig Sauer Inc.