| Muon Marketing, LLC | |
| Muon Space, Inc. | California |
| Muonics, Inc. | California |
| Muoro | |
| Mural | California |
| Mural Health | |
| Mural Oncology | Massachusetts |
| Murally | California |
| Murano Corporation | North Carolina |
| Murano Software, Inc. | California |
| Murf AI | Utah |
| Murfreesboro Web Designers | |
| MuriGenics | California |
| Murj, Inc. | California |
| Murnet Technologies, Inc. | Florida |
| Murphree Venture Partners | Texas |
| Murphy Consulting | |
| Murphy Consulting, Inc. | Georgia |
| Murray Resources | |
| Murray State College | Oklahoma |
| Murray State University | Kentucky |
| Murrieta Genomics | |
| Murrietta Circuits | California |
| Murror | |
| Muscovy Technology Group, Inc. | Colorado |
| Muse.ai | California |
| MuseArts | Vermont |
| Museum Data Solutions | Ohio |
| Musguard, LLC | |
| Mushkin Enhanced MFG | Texas |
| Mushoo, Inc. | Nevada |
| Mushroom Networks, Inc. | California |
| Mushroom Solutions | |
| Musicbuk, Inc. | |
| MusicEase | Illinois |
| MusicMaster, Inc. | Texas |
| MusicXML | Colorado |
| musikCube | California |
| MusiQuest | |
| Musitek Corporation | California |
| Musketeers.me, LLC | Virginia |
| Muskingum University | Ohio |
| Musselwhite Marketing | |
| Mustang Bio | Massachusetts |
| Mustardseed Media | Michigan |
| MustBeOnline, Inc. | New York |
| MustX Digital | |
| Mutant Mail | Wyoming |
| Mutare, Inc. | Illinois |
| Mutiny | |