| ID | Name | Type |
|---|---|---|
| #8881 | MXK | ? |
| #18229 | MaRaf Software | Z |
| #22148 | Maachal | + |
| #8882 | Mac [1] | ? |
| #8883 | Mac [PL] | ? |
| #8884 | MacDonald | ? |
| #8885 | Macbride | Z |
| #19537 | Macdonald & Co (Publishers) Ltd | P |
| #8886 | Machinecraft Ltd | M |
| #8887 | Maciej J. Woloszyk | + |
| #19067 | Maciej Kasatkin | + |
| #8888 | Maciej Maniecki | + |
| #8889 | Maciej Zielinski | + |
| #8891 | Macmillan Education Ltd | P |
| #15891 | Macmillan Press | Z |
| #8892 | Macmillan Publishers Ltd | Z |
| #8893 | Macmillan Publishing Company | Z |
| #8894 | Macmillan Software Ltd | Z |
| #8895 | Macquillan Electronics | Z |
| #8896 | Macronics Systems Ltd | S |