Activision Blizzard, Inc. is an American video game holding company based in Santa Monica, California. Activision Blizzard currently includes five business units: Activision Publishing, Blizzard Entertainment, King, Major League Gaming, and Activision Blizzard Studios. Founded in July 2008 through the merger of Activision, Inc. (the publicly traded parent company of Activision Publishing) and Vivendi Games, the company owns and operates additional subsidiary studios, as part of Activision Publishing, including Treyarch, Infinity Ward, and High Moon Studios.
https://en.wikipedia.org/wiki/Activision_Blizzard