CBS Corporation ( , ) is an American media conglomerate focused on broadcasting, publishing, billboards, and television production, with most of its operations in the United States. The President and CEO of the company is Leslie Moonves. Sumner Redstone, whose company National Amusements is CBS's majority shareholder, serves as Chairman. The company came into being on December 31, 2005 and began trading on the NYSE on January 3, 2006. It is the legal successor to the "old" Viacom.