 | 369 Interactive, a division of Radical Entertainment, began in 2003. In 2005, 369 Interactive was merged into Radical Entertainment. |
 | Activision was founded in 1979 by a group of Atari programmers. It merged with Vivendi Games in 2007 to form Activision Blizzard. |
 | Adventure International began in 1978 by Scott and Alexis Adams. It went bankrupt in 1985 as a result of the video game crash of 1983. |
 | Intelligent Systems began in 1986 by Toru Narihiro. In 2013, Intelligent Systems moved to a building near Nintendo headquarters. |
 | Nintendo began in 1889 by Fusajiro Yamauchi. In 1969, Nintendo was listed on the Osaka Securities Exchange. |
 | Otoy began in 2008 by Alissa Grainger, Tim Hawkin, Malcolm Taylor, and Jules Urbach. |
 | Sega began in 1960 by Dave Rosen, Marty Bromley, Jim Humpbert, and Irv Bromberg as a portmanteau of the 1945 firm, Service Games. |
 | Sega AM Research & Development Department #2 began in 1990 as a subsidiary of Sega. It was made up of staff from Sega R&D #8. |
 | Sega Research & Development #8 began in 1988 as a subsidiary of Sega. It was made up of staff from Studio 128. |
 | Sega Software Research & Development Department #2 began in 1999 as a subsidiary of Sega. It was made up of staff from Sega AM2. |
 | Studio 128 began in 1986 as a subsidiary of Sega. It was made up of staff from Sega AM1. |
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| 3f Interactive | Access Software | Adventure Soft | Alcachofa Soft | |||
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| Animation Magic |
Autumn Moon | Broderbund | Burst | Cockroach | Coktel | Crackpot |
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| Cyan Worlds | Cyberphobx | Darkworks | Dontnod Entertainment | Double Fine | Daedalic | Dreamer's Guild |
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| Dynamix | Earplay | Funcom | Geeta Games | Gray Design Associates | Grundislav Games | Himalaya Studios |
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| Hulabee | Human Code | Humungous Entertainment | Icom | IF Games | Infamous Quests | Infocom |
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| Infogrames | Interactive Binary Illusions | Irresponsible Games | Joshua Nuemberger | Juniper Games | King Art Games | Krystian Majewski |
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| LK Avalon | LucasArts | Magnet Interactive | Metropolis Software | Microids | MP Entertainment | MunkyFun |
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| N-Fusion | The Odd Gentlemen | Pencil Test Studios | Pendulo Studios | Philips | Pinkerton Road | Presto Studios |
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| Red Thread Games | Replay Games | Revolution Software | Scott Adams | Sierra | Silver Style | |
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| Skygoblin | Société Pollene | Squinky | Straandlooper | The Software Farm | Sumo Digital | Technocrat Games |
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| Terra Nova Development | Telltale Games | Terrible Toybox | Transolar Games | Trilobyte | Two Guys From Andromeda | Venture Moon |
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| Viacom | Videlectix | Wadjet Eye Games | Walk Thru Walls | Westwood Studios | Wizarbox | No Sense |
