 | 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. |
 | LucasArts continued the business of Lucasfilm Games in 1990. It reverted back to the name Lucasfilm Games in 2021. |
 | Lucasfilm Games was founded in 1982 as Lucasfilm Games Group, became Lucasfilm Games in 1984, and LucasArts in 1990. |
 | Namco began in 1955 by Masaya Nakamura. In 2005, Namco merged with Bandai. |
 | Nintendo began in 1889 by Fusajiro Yamauchi. In 1969, Nintendo was listed on the Osaka Securities Exchange. |
 | On-Line Systems was founded by Ken and Roberta Williams in 1980. It was renamed Sierra On-Line in 1982. |
 | 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. |
 | Sierra On-Line is the company in which On-Line Systems became in 1982. It closed in 2008 and returned as the Sierra label in 2014. |
 | Straandlooper was an animation studio and video game developer that was founded in Northern Ireland in 2008. |
 | Studio 128 began in 1986 as a subsidiary of Sega. It was made up of staff from Sega AM1. |
 | Taito was founded by Michael Kogan in 1953. Square Enix purchased Taito in 2006. |
 | Telltale Games was founded in 2004 and went into assignment in 2018. It was continued by LCG Entertainment as Telltale. |
 | Telltale, Inc. became the entity by which LCG Entertainment was doing business as after it acquired Telltale Games in 2018. |
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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 |
 |  |  |  |  |  |  |
| Cyan Worlds | Cyberphobx | Darkworks | Dontnod Entertainment | Double Fine | Daedalic | Dreamer's Guild |
 |  |  |  |  |  |  |
| 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 |
 |  |  |  |  |  |  |
| Infogrames | Interactive Binary Illusions | Irresponsible Games | Joshua Nuemberger | Juniper Games | King Art Games | Krystian Majewski |
 |  |  |  |  |  | |
| LK Avalon | Magnet Interactive | Metropolis Software | Microids | MP Entertainment | MunkyFun | |
 |  |  |  |  |  |  |
| N-Fusion | The Odd Gentlemen | Pencil Test Studios | Pendulo Studios | Philips | Pinkerton Road | Presto Studios |
 |  |  |  |  | ||
| Red Thread Games | Replay Games | Revolution Software | Scott Adams | Silver Style | ||
 |  |  |  |  |  | |
| Skygoblin | Société Pollene | Squinky | The Software Farm | Sumo Digital | Technocrat Games | |
 |  |  |  |  |  | |
| Terra Nova Development | Terrible Toybox | Transolar Games | Trilobyte | Two Guys From Andromeda | Venture Moon | |
 |  |  |  |  |  |  |
| Viacom | Videlectix | Wadjet Eye Games | Walk Thru Walls | Westwood Studios | Wizarbox | No Sense |
