| MAA Laboratories, Inc. | North Carolina |
| Maana Discoveries, Inc. | |
| MAB | California |
| Mabbly | Illinois |
| Mabe Enterprises | Texas |
| MabGenesis, Inc. | |
| mabl, Inc. | Massachusetts |
| Mabloc | |
| Mablytics, Inc. | California |
| Mac Business Solutions | Maryland |
| Mac Millan Interactive Communications, LLC | California |
| Mac Nurse | Vermont |
| Mac to School | California |
| MaC Venture Capital | |
| MAC's Tech Hut | Pennsylvania |
| Mac+PC Tech Pro | Florida |
| Mac-O-Rama | Nevada |
| Mac2 Macintosh Users Group | Ohio |
| Macabacus, Inc. | |
| Macalester College Mathematics, Statistics and Computer Science | Minnesota |
| Macally | California |
| MacAnnex Corporation | Massachusetts |
| Maccius | Nevada |
| MacConnect | New York |
| MacData | Florida |
| MacDermid, Inc. | Connecticut |
| MacDialUp.net | California |
| MacDoctors | South Dakota |
| Macdonald Design, Inc. | California |
| MacGurus | Idaho |
| Mach 1 Media | Texas |
| MACH Software | Ohio |
| Mach1 | |
| Mach2 Software, LLC | New York |
| MACH37 | Virginia |
| Mach5 Therapeutics, Inc. | |
| Mach7 Technologies | Vermont |
| Mach9 | Pennsylvania |
| Machado Consulting | Massachusetts |
| Machaon Diagnostics, Inc. | California |
| Machavert Pharmaceuticals | |
| MachHighway | Colorado |
| Machifiny, Inc. | California |
| Machina Labs | |
| Machine Design Services, Inc. | Massachusetts |
| Machine Intelligence Research Institute | California |
| Machine Learning Conference | California |
| Machine Learning Yearning | Washington |
| Machine Solutions | Arizona |
| Machine Tek Corporation | |