| Name | Type | Versions | Avg. | User |
|---|---|---|---|---|
| MacGameStore.com | Game company | Commerce | - | - |
| Machinegame | Game company | Game developer | - | - |
| MachineGames | Game company | Game developer | - | - |
| Machinima | Game company | Commerce | - | - |
| Macrograph | Game company | Game developer | - | - |
| Mad Catz | Game company | Game product manufacturer | - | - |
| Mad Catz FPS Pro Controller | Game company | Game product manufacturer | - | - |
| Mad Catz Interactive | Game company | Game developer | - | - |
| Mad Catz Interactive | Game company | Game publisher | - | - |
| Mad Catz Interactive | Game company | Game product manufacturer | - | - |
| Mad Catz Interactive, Inc | Game company | Game product manufacturer | - | - |
| Made In Me | Game company | Game developer | - | - |
| MADFINGER Games | Game company | Game developer | - | - |
| Madgarden | Game company | Game developer | - | - |
| Mages | Game company | Game publisher | - | - |
| MAGFest | Game company | Commerce | - | - |
| Magic Pixel Games | Game company | Game developer | - | - |
| MagicalTimeBean | Game company | Game developer | - | - |
| Magiko Gaming | Game company | Game developer | - | - |
| Magnavox Odyssey | Game company | Game product manufacturer | - | - |
| MAIET Entertainment | Game company | Game developer | - | - |
| Maingear | Game company | Game product manufacturer | - | - |
| Mainly About Games | Game company | Game developer | - | - |
| Maius Games | Game company | Game developer | - | - |
| Majesco Entertainment | Game company | Game publisher | - | - |
| Major League Gaming | Game company | Commerce | - | - |
| Making Fun | Game company | Game developer | - | - |
| MAME | Game company | Investment | - | - |
| Mana Bar Melbourne | Game company | Commerce | - | - |
| Manchester MCM Expo | Game company | Commerce | - | - |
| Mane6 | Game company | Game developer | - | - |
| MangaGamer | Game company | Game publisher | - | - |
| Maniac Games | Game company | Game developer | - | - |
| Maniac Games | Game company | Game publisher | - | - |
| Marvel Comics | Game company | Game publisher | - | - |
| Marvel Games | Game company | Game developer | - | - |
| Marvel Games | Game company | Investment | - | - |
| Marvell | Game company | Game product manufacturer | - | - |
| Marvelous | Game company | Game publisher | - | - |
| Marvelous AQL | Game company | Game developer | - | - |
| Marvelous Entertainment | Game company | Game publisher | - | - |
| Mass Creation | Game company | Game developer | - | - |
| Mass Luminosity | Game company | Investment | - | - |
| Mass Luminosity | Game company | Commerce | - | - |
| Massive | Game company | Game developer | - | - |
| Massive Bear Studios | Game company | Game developer | - | - |
| Massive Bear Studios | Game company | Game publisher | - | - |
| Massive Entertainment | Game company | Game developer | - | - |
| Massive Joe Studios | Game company | Game developer | - | - |
| Master System | Game company | Game product manufacturer | - | - |
| Mastertronic | Game company | Game publisher | - | - |
| Mastertronic | Game company | Game developer | - | - |
| Masthead Studios | Game company | Game developer | - | - |
| Mastiff Games | Game company | Game developer | - | - |
| Mastiff Games | Game company | Game publisher | - | - |
| Matrix Games | Game company | Game publisher | - | - |
| Matrix Software | Game company | Game developer | - | - |
| Mattel | Game company | Investment | - | - |
| Max Factory | Game company | Game publisher | - | - |
| Maxbuy.cc | Game company | Commerce | - | - |
| Maxbuy.cc | Game company | Game product manufacturer | - | - |
| Maxis | Game company | Game developer | - | - |
| Maxis | Game company | Game product manufacturer | - | - |
| Maxis | Game company | Game publisher | - | - |
| MBXGames | Game company | Game developer | - | - |
| MCM Expo London | Game company | Commerce | - | - |
| MCM Expo Telford | Game company | Commerce | - | - |
| McPixel | Game company | Game developer | - | - |
| MCV Industry Excellence Awards 2011 | Game company | Game developer | - | - |
| MCV Industry Excellence Awards 2011 | Game company | Game product manufacturer | - | - |
| MCV Industry Excellence Awards 2012 | Game company | Commerce | - | - |
| Mechanist Games | Game company | Game developer | - | - |
| Media Molecule | Game company | Game developer | - | - |
| Mediatonic | Game company | Game developer | - | - |
| Mediatonic | Game company | Game publisher | - | - |
| Meditonic | Game company | Game developer | - | - |
| MedlMobile | Game company | Game developer | - | - |
| Meet the Experts | Game company | Commerce | - | - |
| Mega Duck | Game company | Commerce | - | - |
| Mega Duck | Game company | Game product manufacturer | - | - |
| Megadev | Game company | Game developer | - | - |
| Megapop Games | Game company | Game developer | - | - |
| Megarom | Game company | Commerce | - | - |
| Megaupload | Game company | Commerce | - | - |
| Meijer | Game company | Commerce | - | - |
| Memetic Games | Game company | Game developer | - | - |
| Memorex | Game company | Game product manufacturer | - | - |
| Mercury Steam | Game company | Game developer | - | - |
| MercuryStream | Game company | Game developer | - | - |
| Mere Mortals | Game company | Game developer | - | - |
| mergegames | Game company | Commerce | - | - |
| mergegames | Game company | Game publisher | - | - |
| Meridian4 | Game company | Game publisher | - | - |
| Metacritic | Game company | Commerce | - | - |
| Metal Gear Art Studio | Game company | Game developer | - | - |
| Metaversal | Game company | Game developer | - | - |
| Meteor Entertainment | Game company | Game publisher | - | - |
| Meteor Games | Game company | Game publisher | - | - |
| Metro | Game company | Commerce | - | - |
| MetroGames | Game company | Game developer | - | - |
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