| Master Systems, Inc. | Virginia |
| MasterBorn | |
| Mastercard | |
| Mastercard Developers | |
| MasterClass | |
| Masterclock, Inc. | Missouri |
| MasterControl, Inc. | Utah |
| MasterMind Systems, Inc. | Ohio |
| MasterMindSEO | Michigan |
| MasterMine Software, Inc. | Minnesota |
| Masterpiece Solutions, Inc. | Colorado |
| MasterPlan Financial Software | California |
| Masters Marketing Group | |
| Mastersint | Oklahoma |
| Mastersolve, Inc. | Missouri |
| MasterTax, LLC | Arizona |
| Mastertrack | |
| Masterworks Web Design | Puerto Rico |
| Masthead Technology, LLC | |
| Mastiff, LLC | California |
| Masuga | Michigan |
| Mat-Su College | Alaska |
| Mat-Su College Associate of Applied Science in Computer Systems and Network Technology | Alaska |
| Mat-Su Computer Medics | Alaska |
| Mat3ra | California |
| Matador Solutions | |
| Matanuska Telecom Association | Alaska |
| Match Point Partners, LLC | |
| Match.dev | |
| Matcha Design | |
| MatchBack Systems, Inc. | Wisconsin |
| Matchbox Design Group | Missouri |
| MatchCraft | California |
| MatchLog Solutions | |
| Matchnode | |
| Matchr | Florida |
| Matchstick Studio, LLC | |
| Matchstick Ventures | Colorado |
| MatchTune, Inc. | Delaware |
| Matej Lančarič | |
| Matellio, Inc. | California |
| MateMedia | New York |
| Matera | |
| Materia Agency USA, LLC | |
| Materia AI | |
| Material Holdings, LLC | |
| Material Impact | |
| Material Inventory Report System | Michigan |
| Material Management Software | Texas |
| Material Security | California |