Steam

Steam is owned by Valve Corporation, headquartered in the United States. Yes. The ultimate owner of Steam, Valve Corporation, is headquartered in the United States.

Valve Corporation is an American video game developer, publisher, and digital distribution company founded in 1996. Best known for developing landmark game franchises and for creating and operating the Steam platform, Valve runs development teams and global services while owning and managing the Steam storefront and underlying infrastructure.