Sigma Corporation is a Japanese company, manufacturing cameras, lenses, flashes and other photographic accessories. All Sigma products are produced in the company's own Aizu factory in Bandai, Fukushima, Japan. Wikipedia
Founded: September 9, 1961, Setagaya City, Tokyo, Japan
CEO: Kazuto Yamaki (Jan 18, 2012–)
Subsidiaries: Foveon, Inc., SIGMA America, and Sigma Imaging (UK) Ltd.
Headquarters: Kawasaki, Kanagawa, Japan