1: Konami
And then I don't know anymore... All I know is with Silent Hill, Metal Gear, and Castlevania, Konami takes the cake...
But others would probably include Squaresoft, Nintendo, Capcom... uhhh... I dunno... Rockstar or whatever the DEVELOPER that makes GTA is... or something... Even though the only game of theirs I've played was GTA3 (or the GTA series I guess)