| Made4Net | New Jersey |
| Madeinoxy, LLC | |
| Madeinweb Digital, LLC | Florida |
| Madeo | |
| Madgigs Corporation | |
| Madhive | New York |
| MadhiveAgency | |
| Madhya Agency | |
| Madion+Main | Virginia |
| Madison Area Technical College | Wisconsin |
| Madison Ave. Collective | |
| Madison Cloud | Florida |
| Madison Computer Works, Inc. | Wisconsin |
| Madison Dearborn Partners, LLC | |
| Madison Performance Group | New York |
| Madison Scientific, Inc. | |
| Madison Startups | Wisconsin |
| Madison Studios, Inc. | Georgia |
| Madison Technologies, Inc. | New York |
| MadisonLogic | New York |
| MadKudu | California |
| MADM Media + Marketing | |
| Madonna University | Michigan |
| Madorra, Inc. | Oregon |
| Madras Computers, LLC | Oregon |
| Madrigal Pharmaceuticals, Inc. | |
| MadRiver Access, LLC | Vermont |
| MadRiverWeb | Vermont |
| Madrona Venture Group | Washington |
| Madrona Venture Labs | Washington |
| Madryn Asset Management | New York |
| Madwire Mediart | Colorado |
| Maelstrom Studio | |
| Maestro | |
| Maestro Technologies, Inc. | New Jersey |
| MaestroAQ | New York |
| MaestroVision | Florida |
| MAG Aerospace | Virginia |
| Mag Layers USA, Inc. | California |
| MAG Optics, Inc. | Massachusetts |
| Mag+ | New York |
| Magadia Consulting, Inc. | Maryland |
| Magai | California |
| Magalix | Washington |
| Magalukdev | |
| Magarac Venture Partners | Pennsylvania |
| Magaya Corporation | Florida |
| MagBio Genomics, Inc. | Maryland |
| Mage Data | New York |
| Mage H.D., Inc. | |