Japan :

Acclaim Japan Ltd. 
Arc Systems Works Co Ltd
Artdink Corporation 
Aruze Corp
Ascii Corp 
Ask Co Ltd 
Asmik Ace Entertainment 
Astroll Co Ltd 
Athena Co Ltd 
Atlus Co Ltd
Bandai Co Ltd 
Banpresto Co Ltd
Bullet-Proof Software
Capcom Co Ltd 
Chun Soft Co Ltd 
Compile Corp
Data East Corp
Dazz Co Ltd 
Ecseco Development Ltd 
Eidos Interactive KK
Electronic Arts-Square KK 
Enix Corp 
Entertainment Software Publishing
Escot Corp
From Software 
Fujikic, Inc 
Gaga Communications
Genki Co Ltd. 
Gust Co Ltd 
Hakuhodo Inc. 
Hands On Entertainment Inc
Heartbeat Inc. 
Hect Co Ltd
Hudson Soft Co Ltd
I4 Corp 
Idea Factory Co Ltd 
Imagineer Co Ltd 
Irem Software Engineering
Jaleco Ltd
Jorudan Co Ltd 
Kadokawa Shoten Publishing Co Ltd
Kaga Tech Co Ltd 
Kodansha Ltd
KOEI Co Ltd. 
Konami Co Ltd 
Locus Co 
M2 TO Inc 
Magical Company 
Mainichi Communications Inc.
Media Factory
Media Works Inc
Mitsui & Co Ltd
Namco Limited 
Nihon Syscom Co Ltd
Nippon Inchi Software Inc
Openbook9003 Inc
Pioneer Ldc
Riverhillsoft Inc 
Sammy Corporation
Seta Corporation 
Shoeisha Co Ltd
Shogakukan Production Co Ltd
SNK Corp
Sony Computer Entertainment Inc 
Sony Music Entertainment (Japan) Inc. 
Spike Co Ltd. 
Square Co Ltd. 
Starfish Inc
Success Corporation
Sun Corporation 
Sunrise Interactive
T&E Soft Inc
Taito Corporation 
Takara Co Ltd
Tecmo Ltd
Titus Japan KK
Tokuma Shoten Co Ltd
Tomy Company Ltd 
Tonkinhouse
TYO Productions
Ubi Soft KK
UEP Systems Inc 
Victor Interactive Software Inc 
Video System Co Ltd
VR-1 Japan 
Warashi Inc. 
Woopee Camp
Winky Soft Co Ltd
Xing Inc. 
Yuki Enterprise Inc. 


Usa :

989 Studios 
7 Studios
Acclaim Entertainment Inc
Activision Inc
Agetec Inc
American Softworks Corp
AndNow (Virtual Ocean, Nooks and Crannies) 
Atlus USA Inc
Bungie Software
Capcom Entertainment
Cerny Games
Cube 
Crave Entertainment
Digital Anvil
Dreamworks Interactive LLC
Eidos Interactive
Electronic Arts
Enix Corp
Flesh & Wire (Running With Scissors) 
Fox Interactive
GT Interactive
Oddworld Inhabitants (Hand of Odd, Munch's Oddysee) 
Hasbro Interactive
Humongous Entertainment
Incredible technologies
Infogrames Entertainment
Insomniac Games
Interplay Entertainment
Konami of America
LucasArts Entertainment
Midway Home Entertainment (Spy Hunter)
Mindscape
Namco Hometek
Naughty Dog
Neversoft
Psygnosis 
Red Storm Entertainment
Rage Software 
Shiny Entertainment
Sierra Online (Professional Bullrider)
Square Electronic Arts
Stormfront Studios
Sunsoft
Surreal
Take-Two Interactive/Rockstar
TerraGlyph Interactive
The 3DO Company
THQ
Titus
Ubi Soft
Universal Interactive
Working Designs 

Europa :

3DO Europe Ltd
Acclaim Entertainment (Europe) 
Activision UK Ltd
Argonaut Software
Criterion (Trickstyle 2)
Codemasters Software
Core Design
Disney Interactive
Eden Studios
Eidos Plc
Electronic Arts Ltd
Eurocom Developments Ltd
GTI Software Europe
Hasbro Interactive Ltd
Infrogrames Entertainment
Kalisto Entertainment
Konami of Europe
Lego Media International
Lionhead Studios
Rage Software (Untitled Game)
Reflections
Revolution
Square Europe Ltd
Take-2 Interactive Software Europe Ltd
THQ International
Travelers’ Takes UK
Ubi Soft Entertainment 
Virgin Interactive Entertainment Europe