| ID | Name | Type |
|---|---|---|
| #1344 | Aslett Scholey | ? |
| #1345 | Asoft | ? |
| #1346 | Asphyxia | ? |
| #1347 | Aspic | ? |
| #1348 | Assassin Software | Z |
| #1349 | Assoc. Magazines | Z |
| #16688 | Associated Computer Marketing Ltd | Z |
| #16516 | Ast A. Moore | + |
| #19026 | AsteroideZX | - |
| #1350 | Astonishing Animations | Z |
| #1351 | Astor Software | Z |
| #1352 | Astra Software | Z |
| #1353 | Astracom | ? |
| #1355 | Astral Software | Z |
| #1356 | Astral Software Ltd | Z |
| #1357 | Astro Programmes | Z |
| #1358 | Astro Software | Z |
| #1359 | Astro-Service Maitenbeth | Z |
| #1360 | Astrobyte Computer Games | Z |
| #1361 | Astrocalc | P |