Square Enix Holdings Co., Ltd. (株式会社スクウェア・エニックス・ホールディングス Kabushiki-gaisha Sukuwea Enikkusu Hōrudingusu) is a Japanese video game developer, publisher, and distribution company that is best known for its role-playing video game franchises, which include the Final Fantasy, Dragon Quest, Kingdom Hearts role-playing game series. Its headquarters are located in the Shinjuku Eastside Square Building in Shinjuku, Tokyo.
The original Square Enix was formed as the result of a merger between Square and Enix. More: en.wikipedia.org.