| Title | Games |
 | Mad Doc Software LLC
Lawrence, MA | 1 |
| MadCat Interactive
Location Unknown | 0 |
| Magenta Software Ltd.
Albert Dock, Liverpool, UK | 0 |
| Mass Media
Moorpark, CA | 1 |
| Massive Entertianment
Sweden | 0 |
| Mattel Interactive
El Segundo, California | 0 |
| Maxis Studios
Emeryville, California | 1 |
| Media Vision
Japan | 0 |
| MercurySteam
Spain | 4 |
| Metro 3D
Location Unknown | 0 |
| Metropolis Software
Poland | 2 |
| Microids
Global | 0 |
| Microsoft
Redmond, Washington | 64 |
| Microsoft Game Studios Japan
Japan | 4 |
| Midway Entertainment
Location Unknown | 6 |
| Midway Studios Austin
Austin, TX | 1 |
| MIG Entertainment
Location Unknown | 0 |
| Milestone
Location Unknown | 18 |
| Mindware
Czech Republic | 2 |
| Mithis
Location Unknown | 0 |
| MixMax
Location Unknown | 0 |
| Monolith Productions
Location Unknown | 9 |
| Monster Games
Location Unknown | 0 |
| Monster Games
Hamburg, Germany | 0 |
| Mucky Foot Productions
Surrey, UK | 0 |
| Mistwalker
Location Unknown | 2 |
| MumboJumbo LLC
Location Unknown | 1 |
| Majesco
Location Unknown | 1 |
| MTV Games
Location Unknown | 0 |
| Mine Loader Software
Location Unknown | 1 |
| Mondo Media
Location Unknown | 3 |
| Marvelous Interactive
Location Unknown | 1 |
| MAXUM Games
Location Unknown | 1 |
| Midway Studios Chicago
Location Unknown | 1 |
| Masterpiece
Location Unknown | 1 |
| Merscom LLC
Location Unknown | 1 |
| Monsune Moon
Location Unknown | 2 |
| Metacreature Games
Location Unknown | 0 |
| Mo
Location Unknown | 1 |
| Mommy's Best Games
Location Unknown | 5 |
| Mere Mortals
Location Unknown | 1 |
| Metropolis Soft.
Location Unknown | 1 |
| Moss Ltd.
Location Unknown | 3 |
| Monumental Games
Location Unknown | 2 |
| Mexond
Location Unknown | 2 |
| Madcat327
Location Unknown | 1 |
| Mana Bomb Game Studios
Location Unknown | 1 |
| m00nkeh
Location Unknown | 1 |
| Mindscape
Location Unknown | 1 |
| Microsoft Research
Location Unknown | 1 |
| Most Wanted
Location Unknown | 1 |
| Monkeypaw Games
Location Unknown | 1 |
| Mojang AB
Location Unknown | 0 |
| Mastiff
Location Unknown | 2 |
| Mad Catz
Location Unknown | 1 |
| Miniclip
Location Unknown | 10 |
| M2
Location Unknown | 5 |
| Mando Productions
Location Unknown | 1 |
| Mossmouth
Location Unknown | 1 |
| Moon Spider Studio
Location Unknown | 1 |
| Maximum Games
Location Unknown | 1 |
| Might and Delight
Location Unknown | 1 |
| MaxNick
Location Unknown | 1 |
| Merge Interactive
Location Unknown | 3 |
| Mokus
Location Unknown | 1 |
| Marker Metro
Location Unknown | 2 |
| Monkey Bar Games
Location Unknown | 1 |
| MachineGames
Location Unknown | 1 |
| Mighty Rocket Studio
Location Unknown | 1 |
| Magic Pockets
Location Unknown | 1 |
| Mediatonic
Location Unknown | 1 |
| MLB
Location Unknown | 1 |
| Microsoft Studios
Location Unknown | 1 |
| Mouldy Toof
Location Unknown | 1 |
|
HQ Network: 1,544 | 
Guests: 654 |
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