From Sega Retro
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CSK, whose abbreviation has varied in meaning over the years, was a Japanese business services conglomerate.
They were the parent company of Sega from 1984 through 2004. They also operated a middleware/software development division of their own, CSK Research Institute (better known as CRI). In 1995, they established one of Sega's North American divisions called SegaSoft, and in the late 1990s operated GD-NET, a publishing partnership between several game developers (ESP, Quintet, possibly Sting, possibly Game Arts, possibly Treasure, etc.).
In 2011, they merged with Sumisho Computer Systems, with Sumisho taking full control. The merged company continues to operate as SCSK.
|Domestic Sega studios|
|CSK||Sega Sammy Holdings|
|Sega Enterprises, Ltd.||Sega Corporation||Sega Games & Interactive|
|Sega R&D 1||Sega AM1||R&D #1||WOW Entertainment||Sega WOW||Sega AM1|
|Studio 128||Sega R&D 8||Sega AM2||R&D #2||AM2 of CRI||Sega-AM2||Sega AM2|
|Sega AM11||R&D #4||Amusement Vision||New Entertainment||Sega CS1|
|Ryu ga Gotoku Studio|
|Sega AM3||R&D #3||Hitmaker||Sega AM3|
|AM Annex||R&D #5||Sega Rosso|
|Sega AM4||Sega Mechatro||Product R&D|
|N. Pro. R&D|
|Sega AM5||Mirai R&D||Family Entertainment|
|Sega R&D 2||Sega CS||Sega CS1||R&D #6||Smilebit||Sega Sports Design|
|Sega PC||Online R&D|
|Sega CS2||R&D #7||Overworks||GE2||Sega CS3|
|Sega CS3||R&D #8||GE1||Sega CS2|
|R&D #9||United Game Artists|
|Sega Sound Team|
|Sega Digital Media||Wave Master||Wave Master (label)|
|Mobile Content R&D||Sega Networks|
|Visual Entertainment||Marza Animation Planet|