There is bit of ambiguity in the question. Are we supposed to state the production houses or development houses?
In either case,
Developers: Team ICO (Ico, Shadow of the colossus), Valve (HL,L4D,TF), Bioware(DA,ME) Polyphony Digial (GranTurismo), Rockstar North(GTA), Idsoft(DOOM,Quake), UBISoft Montreal (POP, AC,FC2), EA Cannada (NFS, Sims 3), EA Redwood Shore/Visceral (DeadSpace) Firaxis (Civilization), Konami (contra, MGS,PES), SCE-SM(God of War), Naughty Dog (Crash Bandicoot, Uncharted), Nintendo (Mario, Legend of Zleda), Namco(Tekken)
Companies: SCEI, Take-Two, ZeniMax Media, Capcom, Nintendo