| ID | Name | Type |
|---|---|---|
| #6698 | J.W.V. Software | Z |
| #6699 | J250 | ? |
| #6700 | JA Software | Z |
| #6701 | JAF | ? |
| #6702 | JAM | ? |
| #6703 | JAR Electronics | Z |
| #6704 | JAST USA | ? |
| #6705 | JAsoft | Z |
| #6706 | JB | ? |
| #6707 | JB Computing | Z |
| #6708 | JB Software | S |
| #6709 | JBS | ? |
| #17376 | JBS Records | D |
| #6710 | JC Jumbo Data | ? |
| #6711 | JCR Software | Z |
| #6712 | JCS Software | Z |
| #6713 | JCS ZX Software | Z |
| #6714 | JEDI Luminary | ? |
| #6715 | JEP Electronics Ltd | Z |
| #6716 | JET_VISY | ? |