From Wikipedia
Platinum Games, Inc. is a Japan-based independent video game development company. It was founded under the name Seeds, Inc. on August 1, 2006 by Shinji Mikami, Atsushi Inaba and Hideki Kamiya, the former key members of Capcom's Clover Studio and still retains many other former members of the studio.[1]
Clover Studio was responsible for many critically-acclaimed titles such as Viewtiful Joe and Ōkami. In October 2006, the Capcom Board of Directors voted to shut down the studio. The dissolution took place in March 2007 and all original IPs developed by Clover (Viewtiful Joe, Ōkami and God Hand) remained with Capcom.
The company merged with ODD Incorporated in October 2007. In May 2008, PlatinumGames announced a four game deal with Sega. The games involved in the development and publishing deal included Bayonetta, a "stylish action game" for the PlayStation 3 and Xbox 360 directed by Hideki Kamiya and featuring "a witch battling angels", a science-fiction RPG for the Nintendo DS called Infinite Space, and MadWorld, an "ultra ultra violent" action game for the Wii with black and white Sin City-inspired graphics. The fourth title, Vanquish, directed by Shinji Mikami, has been recently revealed, but little information on the title has been released.