SCSK

You can help expand this article with text translated from the corresponding article in Japanese. (October 2026) Click [show] for important translation instructions. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must follow the LLM translation guideline, revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Consider adding a topic to this template: there are already 1,644 articles in the main category, and specifying|topic= will aid in categorization. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Japanese Wikipedia article at [[:ja:SCSK]]; see its history for attribution. You may also add the template {{Translated|ja|SCSK}} to the talk page. For more guidance, see Wikipedia:Translation.

SCSK Corporation
Native name	株式会社SCSK
Romanized name	Kabushiki-gaisha Esu-Shī-Esu-Kei
Formerly	Sumitomo Computer Service Corporation (1969–2005) Sumitomo Computer System Corporation (2005–2011)
Type	Subsidiary
Traded as	TYO: 9719 (1989-2026)
Industry	System integration Information security Computer software
Predecessor	CSK Corporation
Founded	1968; 58 years ago (1968)
Founder	Isao Okawa
Headquarters	Toyosu, Kōtō, Tokyo , Japan
Revenue	¥323.9 billion
Total assets	¥21.1 billion
Number of employees	11,910 (2017)
Parent	Sumitomo Corporation
Subsidiaries	CRI Middleware
Website	www.scsk.jp

SCSK Corporation (株式会社SCSK, Kabushiki-gaisha Esu-Shī-Esu-Kei) is a Japanese information technology company headquartered in Tokyo, Japan, offering IT services and computer software.

History

In 1969, Sumitomo Computer Service Corporation was established by Sumitomo Corporation. In 2005, Sumitomo Computer Service Corporation and Sumitomo Electronics Corporation were merged into Sumitomo Computer System Corporation.

Separately, in 1968, CSK Corporation was established by Japanese entrepreneur Isao Okawa in 1968. The acronym CSK was derived from "Computer Service". CSK established CSK Research Institute, later renamed as CRI Middleware, in 1983. At its peak, the company, the largest independent software company in Japan until it being acquired, was called the CSK Group. In the 2000s, its real estate investment business failed, resulting in heavy losses to the company after Okawa's death in 2001.^{[clarification needed]}

Outside of Japan, CSK was widely known for its takeover of Sega in 1984, ended in the sale of the company to Sammy in 2004, through which Sega Sammy Holdings was established.

In April 2011, Sumitomo Corporation acquired CSK through a takeover. In October 2011, Sumitomo Computer System Corporation and CSK Corporation went through a statutory merger, in which Sumitomo Computer System absorbed CSK Corporation and was re-branded SCSK Corporation.

At the 2025 Japan Mobility Show, SCSK unveiled a new electric concept car that leans heavily on emerging artificial intelligence technology to create a personalized experience for each driver. The company claims the car to a software-defined vehicle, wherein the emphasis upon customization is within updatable software as compared to rigid hardware.

SCSK was delisted from the Tokyo Stock Exchange in February 2026.

Services

The company offers the services of system integration, cloud computing, information security and produces computer software in Japan, mostly on a B2B basis for enterprises. SCSK Corporation's business type and scope is similar to those of Itochu Techno-Solutions, Uniadex and Mitsui Knowledge Industry, which also specialize in IT services. The company has been listed on the Tokyo Stock Exchange since 1989, then as Sumitomo Computer Service Corporation.

See also

• List of companies of Japan

References

External links

Wikimedia Commons has media related to SCSK.

• Official website