| ID | Name | Type |
|---|---|---|
| #353 | Action Software | Z |
| #22523 | Action Software [2] | P |
| #355 | ActionStudio | Z |
| #17026 | Actionware | X |
| #356 | Activator | ? |
| #357 | Active Magic | Z |
| #358 | Active Minds | Z |
| #22318 | Activision France | P |
| #359 | Activision Inc | P |
| #21691 | Ad Astra | P |
| #360 | Ad Lomer | - |
| #21369 | Adada Soft Produções | P |
| #361 | Adam | + |
| #20330 | Adam Ainsworth | P |
| #362 | Adam Billyard | + |
| #363 | Adam Britton | + |
| #364 | Adam Bull | + |
| #365 | Adam Bumpsteed | + |
| #18642 | Adam Cadre | + |
| #366 | Adam Clarke | + |