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.