| ID | Name | Type |
|---|---|---|
| #9978 | Mixtring | ? |
| #9979 | Mizar Computing | Z |
| #9980 | Mjúkvara sf | ? |
| #9981 | Mladen Erjavec | ? |
| #22257 | Mladen Popović | + |
| #9982 | Mladinska Knjiga | ? |
| #9983 | Mladost | ? |
| #9984 | Mlodziezowa Agencja Wydawnicza | Z |
| #8858 | MmcM | - |
| #9985 | Mme Sosostris | ? |
| #9986 | Mme Sosostris Astro Computing | Z |
| #18757 | MoNsTeR | - |
| #17548 | Mode-One | S |
| #17549 | Model Makers | S |
| #9988 | Modem House | H |
| #9989 | Modem'Co | ? |
| #9990 | Modular Resources Ltd | Z |
| #9991 | Mog | ? |
| #19578 | Moggy | - |
| #19205 | Mogilew | - |