Squaresoft (or Square Enix if I have to, preferred the Squaresoft years)
Santa Monica Studios
Konami (for historical reasons, fuck current day Konami)
Valve (when they used to make games)
No Blizzard North? C'mon man :(
I'm not good with subdivisions inside developers. For me Blizzard Entertainment is the whole of Blizzard (Diablo, StarCraft, WarCraft and Overwatch) and Nintendo is 2D Mario, 3D Mario, Smash, Mario Kart, Zelda, Metroid, Kirby, etc.) I know it's not the same studio that does it all but I never bothered to learn which does what.