1. Bethesda

2. Rockstar North (I think North are the GTA guys)

3. Naughty Dog

1. Nintendo

2. CING

3. Intelligent System

1) VGChartz
2) Zynga
3) Factor 5

(April Fool's, hurr durr etc)

REAL LIST:

1) Bioware
2) Blizzard Entertainment
3) Nintendo

In case Nintendo is cheating by being several teams:

3) Naughty Dog

1. Retro Studios
2. Valve
3. Monolith Soft

I still dream of a future where Nintendo and Valve merge together. >_

EDIT: I'm copying role

1) Studio 4C (atlus)
2) Visceral
3) Eidos Montreal (only released one game XD)

Blizzard
Naughty dog
Rockstar

1. Square (Soft or Enix, but mainly Enix)

2. Gust

3. Eidos

Seriously, no Konami or Sega yet? K, change my list to Konami, Sega, and Treasure. They need to be in the running people.

1. SEGA
2. Capcom
3. Nintendo

All three aren't as good as they used to be, but they're the best when you consider their entire history.