SCSK Corporation

SCSK Corporation is a Japanese information technology company headquartered in Tokyo that offers IT services and computer software, mostly to enterprises on a business-to-business basis, including system integration, cloud computing and information security. Its roots lie in two firms founded a year apart. Sumitomo Computer Service Corporation was established by Sumitomo Corporation in 1969, and CSK Corporation was set up in 1968 by the entrepreneur Isao Okawa; CSK took over Sega in 1984 and sold it to Sammy in 2004. Sumitomo Corporation acquired CSK in April 2011, and in October 2011 Sumitomo Computer System Corporation absorbed CSK in a statutory merger and was renamed SCSK. The company's listing on the Tokyo Stock Exchange, which began in 1989 under its earlier name, ended when the shares were delisted on March 12, 2026, after shareholders approved a share consolidation on February 9, 2026. SCSK also owns Curl, Inc., which develops the Curl programming language and its commercial products.