If not from me, it's not a list worth reading...
SONY COMPUTER ENTERTAINMENT WORLDWIDE STUDIOS
First party subsidiaries:
-Sony Compter Entertainment Japan (unknown numbers of teams)
-Sony Studios Santa Monica
-Sony Studios Foster City
-Sony Studios Cambridge
-Sony Studios Liverpool
-Sony Studios London (2 teams)
-Guerrilla Games
-Polyphony Digital Studios
-MuuMuu
-Clap Hanz
-Incog Inc.
-Naughty Dog Software
-Sony Bend
-Zipper Interactive
-Solworks Entertainment
-Redzone Entertainment
2nd party (invested+contract+exclusive) Subsidiaries:
-Insomniac Games
-Idol Minds Interactive Entertainment
-Team Bondi
-Evolution Studios
MICROSOFT GAME STUDIOS
First party subsidiaries:
-Microsoft Game Studios Remond (2 teams)
-Microsoft Game Studios Tokyo (2 teams)
-Rare (5 teams)
-Bungie Software
-FASA Studios
-Ensemble Studios
2nd party (invested+contract+exclusive) Subsidiaries:
-Sigil Games
-Big Huge Games
NINTENDO COMPANY
First party subsidiaries:
-Nintendo EAD (15-20 teams)
-Nintendo EAD Tokyo Studio (2 teams)
-Nintendo Software Technology (2 teams)
-Intelligent Systems (3 teams)
-Retro Studios
-Brownie Brown
2nd party (invested+contract+exclusive) Subsidiaries:
-The Pokémon Company
-HAL Laboratory (2 teams)
-Game Freak Entertainment
-Ambrella
-Noise
-Camelot Software Planning
-Alphadream
-Genius Sonority
-Skip
-Game Designer's Studio
...anything missing? Anything outright wrong? Let me know, thanks.
SONY COMPUTER ENTERTAINMENT WORLDWIDE STUDIOS
First party subsidiaries:
-Sony Compter Entertainment Japan (unknown numbers of teams)
-Sony Studios Santa Monica
-Sony Studios Foster City
-Sony Studios Cambridge
-Sony Studios Liverpool
-Sony Studios London (2 teams)
-Guerrilla Games
-Polyphony Digital Studios
-MuuMuu
-Clap Hanz
-Incog Inc.
-Naughty Dog Software
-Sony Bend
-Zipper Interactive
-Solworks Entertainment
-Redzone Entertainment
2nd party (invested+contract+exclusive) Subsidiaries:
-Insomniac Games
-Idol Minds Interactive Entertainment
-Team Bondi
-Evolution Studios
MICROSOFT GAME STUDIOS
First party subsidiaries:
-Microsoft Game Studios Remond (2 teams)
-Microsoft Game Studios Tokyo (2 teams)
-Rare (5 teams)
-Bungie Software
-FASA Studios
-Ensemble Studios
2nd party (invested+contract+exclusive) Subsidiaries:
-Sigil Games
-Big Huge Games
NINTENDO COMPANY
First party subsidiaries:
-Nintendo EAD (15-20 teams)
-Nintendo EAD Tokyo Studio (2 teams)
-Nintendo Software Technology (2 teams)
-Intelligent Systems (3 teams)
-Retro Studios
-Brownie Brown
2nd party (invested+contract+exclusive) Subsidiaries:
-The Pokémon Company
-HAL Laboratory (2 teams)
-Game Freak Entertainment
-Ambrella
-Noise
-Camelot Software Planning
-Alphadream
-Genius Sonority
-Skip
-Game Designer's Studio
...anything missing? Anything outright wrong? Let me know, thanks.