| ID | Name | Type |
|---|---|---|
| #9520 | Mel Davies | + |
| #9521 | Mel James | + |
| #9522 | Melbourne House | P |
| #9523 | Melbourne House Publishers Ltd | Z |
| #9524 | Mellona | ? |
| #17476 | Melmark Microsystems | R |
| #17477 | Melrica Games Hire | X |
| #22714 | Melvin Carter | + |
| #9525 | Melvin Lloyd-Jones | + |
| #19383 | Melvyn Grant | ? |
| #9526 | Melvyn Hamilton | + |
| #9527 | Melvyn Rider | + |
| #19851 | MemSoftware | P |
| #9528 | Memoco Electron | Z |
| #9529 | Memotech | Z |
| #9530 | Memotronic | Z |
| #17478 | Menditall Service Centres | R |
| #9531 | Menno van der Star | ? |
| #19666 | Menomicro | P |
| #9532 | Mental Images | Z |