| ID | Name | Type |
|---|---|---|
| #9365 | MastSoft | Z |
| #9366 | Master | ? |
| #16021 | Master Games | P |
| #9367 | Master Home Computers Group | Z |
| #9368 | Masters Games | Z |
| #20258 | Masters Software Productions | P |
| #9369 | Masters of the Universe | Z |
| #9370 | Mastertronic Added Dimension | Z |
| #9371 | Mastertronic Ltd | P |
| #9372 | Mastertronic Plus | Z |
| #9373 | Mastervision | Z |
| #9374 | Mastodon | ? |
| #9375 | Mastress Software | Z |
| #9383 | Mat | - |
| #9376 | Mat & Muad'Dib | ? |
| #9378 | Mat Buckland | ? |
| #9379 | Mat Corne | ? |
| #9380 | Mat Doughty | ? |
| #9381 | Mat Hubbard | + |
| #9382 | Mat Owen | ? |