Blizzard Entertainment, Inc. is an American video game developer and publisher based in Irvine, California, and is a subsidiary of Activision Blizzard. The company was founded on February 8, 1991, under the name Silicon & Synapse, Inc. by three graduates of the University of California, Los Angeles: Michael Morhaime, Frank Pearce and Allen Adham. The company originally concentrated on the creation of game ports for other studios' games before beginning development of their own software in 1993 with games like Rock n' Roll Racing and The Lost Vikings. In 1994, the company became Chaos Studios, Inc., then Blizzard Entertainment after being acquired by distributor Davidson & Associates.

Blizzard Entertainment

Riot Games is a company that develops, publishes, and supports competitive PvP (player versus player) online team-based strategy games.  Its main offering is League of Legends, a multiplayer online battle arena game. The company also organizes esports tournaments.