| Title | Games |
 | A2M
Montreal, QC Canada | 2 |
| Acclaim Studios
Austin, Texas | 0 |
| Activision
Santa Monica CA | 41 |
| Adrenium Games
Location Unknown | 0 |
| Akella
Russia | 1 |
| Aki Corp
Location Unknown | 0 |
| Atari Inc
Location Unknown | 8 |
| Argonaut Games
London UK | 0 |
| Avalanche Software
Salt Lake City, Utah | 8 |
| Acclaim Entertainment
Location Unknown | 0 |
| Amaze Entertainment
Location Unknown | 1 |
| Amusement Vision
Location Unknown | 0 |
| Amuze
Stockholm, Sweden | 0 |
| Anchor
Japan | 0 |
| Andamiro Entertainment
Seoul, Korea | 0 |
| Angel Studios
Location Unknown | 0 |
| Appaloosa Interactive
Location Unknown | 0 |
| Arc Systems
Austin, Texas | 1 |
| Arkane Studios
Location Unknown | 4 |
| Artech Studios
Location Unknown | 3 |
| Artoon Co
Japan | 1 |
| Asobo Studios
Bordeaux, France | 1 |
| Asylum Entertainment
London, UK | 0 |
| Atlus Software
Irvine, CA | 6 |
| Atomic Planet
UK | 0 |
| Awesome Studios
Location Unknown | 0 |
| Aquire
Japan | 1 |
| AQ Interactive
Japan | 1 |
| artdink
Location Unknown | 0 |
| Artdink
Tsukishima, Tokyo | 1 |
| Alchemic Productions
Location Unknown | 0 |
| ArcSystemWorks Co.
Location Unknown | 3 |
| Alpha System
Location Unknown | 0 |
| Artificial Mind
Location Unknown | 2 |
| Autonomous Productions
Location Unknown | 0 |
| Atomic Elbow
Sweden | 1 |
| A.C.R.O.N.Y.M. Games Inc.
Location Unknown | 1 |
| Alfa System
Location Unknown | 1 |
| Artificial Studios
Location Unknown | 2 |
| Airtight Games
Location Unknown | 3 |
| Access Games
Location Unknown | 2 |
| Arika
Location Unknown | 1 |
| Ascaron Ent. GmbH
Location Unknown | 1 |
| Archor Games
Location Unknown | 1 |
| Arrogancy games
Location Unknown | 2 |
| Ankama Games
Location Unknown | 1 |
| Antab
Location Unknown | 1 |
| arcarocket
Location Unknown | 2 |
| Absobo Studio
Location Unknown | 1 |
| Atomic Games
Location Unknown | 2 |
| Aaron Ramsey
Location Unknown | 1 |
| Arc System Works
Location Unknown | 6 |
| Angelo Pelini
Location Unknown | 1 |
| Angel
Location Unknown | 1 |
| Adrenalin
Location Unknown | 0 |
| Atomic Motion
Location Unknown | 1 |
| Aspyr
Location Unknown | 1 |
| Agent MOO
Location Unknown | 1 |
| ACE
Location Unknown | 2 |
| ASuperSonic
Location Unknown | 1 |
| ACRONYM
Location Unknown | 1 |
| Arkedo
Location Unknown | 5 |
| Azubi
Location Unknown | 1 |
| Aztec
Location Unknown | 1 |
| AxB
Location Unknown | 1 |
| AlMra
Location Unknown | 1 |
| Acony Games
Location Unknown | 1 |
| Asobo Studio
Location Unknown | 5 |
| Alaware Entertainment
Location Unknown | 1 |
| ACQUIRE Corp.
Location Unknown | 2 |
| Apex Systems
Location Unknown | 1 |
| A-Steroids
Location Unknown | 1 |
| Armature Studio
Location Unknown | 1 |
| Arkadium
Location Unknown | 4 |
| ACE Team
Location Unknown | 1 |
| Anuman Interactive
Location Unknown | 3 |
|
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