| G. M. Harris | No tapes | No tapes | No books | No hardware |
| Gem Software | Tapes | No tapes | No books | No hardware |
| Gemini Marketing | No tapes | No tapes | No books | No hardware |
| Giltrole | No tapes | No tapes | No books | No hardware |
| Gladstone Electronics | Tapes | No tapes | No books | No hardware |
| Good Games | No tapes | No tapes | No books | No hardware |
| Gordon Electronics | No tapes | No tapes | No books | No hardware |
| Griffin Software | Tapes | No tapes | No books | No hardware |
| Griffin and George | No tapes | No tapes | No books | No hardware |