| ACS Software | Tapes | No tapes | No books | No hardware |
| ADH Systems | No tapes | No tapes | No books | No hardware |
| A. G. Software | Tapes | No tapes | No books | No hardware |
| AGF Hardware | Tapes | No tapes | No books | No hardware |
| A. J. Rushton | Tapes | No tapes | No books | No hardware |
| A. M. Software | No tapes | No tapes | No books | No hardware |
| A. P. E. Software | No tapes | No tapes | No books | No hardware |
| A. Parsons | No tapes | No tapes | No books | No hardware |
| A. R. Hill | No tapes | No tapes | No books | No hardware |
| A. Readman | No tapes | No tapes | No books | No hardware |
| A to Z Software | No tapes | No tapes | No books | No hardware |
| AVC Software | No tapes | No tapes | No books | No hardware |
| Abacus | Tapes | No tapes | No books | No hardware |
| Abersoft | Tapes | No tapes | No books | No hardware |
| Abies Informatics | No tapes | No tapes | No books | No hardware |
| Ad-Lib | No tapes | No tapes | No books | No hardware |
| Addictive Games | Tapes | Tapes sorted by code | No books | No hardware |
| Addison-Wesley | No tapes | No tapes | Books | No hardware |
| Adrian Boone | No tapes | No tapes | No books | No hardware |
| Afdec Electronics | No tapes | No tapes | No books | No hardware |
| Algor | No tapes | No tapes | No books | No hardware |
| Apropos Technology | Tapes | No tapes | No books | No hardware |
| Argus Specialist Publications | No tapes | No tapes | Books | No hardware |
| Artic | Tapes | No tapes | No books | No hardware |
| Astro Software | No tapes | No tapes | No books | No hardware |
| Audio Computers | No tapes | No tapes | No books | Hardware |
| Automata Cartography | Tapes | No tapes | No books | No hardware |
| Autosoft | No tapes | No tapes | No books | No hardware |
| Axis | Tapes | Tapes sorted by code | No books | No hardware |
| Aylesbury ZX Computer Club | No tapes | No tapes | No books | No hardware |