| Massana Construction INC. GA | Construction | 0 | - | F |
| Massapequa Center LLC NY | Healthcare & Social Assistance | 0 | - | F |
| Massar Capital Management, LP CT | Finance & Insurance | 1 | $170,000 | - |
| MassBiologics MA | - | 0 | - | - |
| MassBiologics of the UMass Chan Medical School MA | - | 0 | - | - |
| MassChallenge, Inc. MA | Finance & Insurance | 2 | $150,841 | - |
| Massconn Distributors CPL, Inc. CT | Manufacturing | 0 | - | F |
| Massena Hospital, Inc. NY | Healthcare & Social Assistance | 1 | $406,593 | - |
| Massett Building Company NJ | Construction | 0 | - | F |
| Massey Construction TN | Construction | 0 | - | F |
| Massey Services Inc FL | Administrative & Waste Services | 0 | - | D |
| Massey Services Inc TX | Administrative & Waste Services | 0 | - | F |
| MassGrow LLC MA | Agriculture & Forestry | 0 | - | F |
| Massively Parallel Technologies, Inc. AZ | Professional & Technical Services | 4 | $121,350 | - |
| Massivit 3D Inc. GA | Manufacturing | 1 | $90,000 | - |
| MassLight, Inc. DE | Professional & Technical Services | 1 | $176,800 | - |
| Masson Farms of New Mexico NM | Agriculture & Forestry | 0 | - | F |
| Massumi Consoli LLP CA | Professional & Technical Services | 2 | $390,000 | - |
| Mast Logistics Services, LLC OH | - | 0 | - | - |
| MAST Technology Services, Inc. OH | Retail Trade | 24 | $141,250 | - |
| Mast-Jaegermeister US, Inc. NY | Wholesale Trade | 1 | $110,000 | - |
| MasTec MN | Construction | 0 | - | C |
| Mastec Services Company, INC FL | Construction | 14 | $99,736 | - |
| MasTec MNS Wireless FL | Construction | 0 | - | D |
| MasTec MNS Wireline FL | Construction | 0 | - | F |
| Mastec North America, Inc. CA | - | 0 | - | - |
| MasTec, Inc. WI | Construction | 0 | - | F |
| Mastech Digital Alliances, Inc. PA | Professional & Technical Services | 1 | $127,878 | - |
| Mastech Digital Solutions, Inc. PA | Professional & Technical Services | 1 | $103,418 | - |
| Mastech Digital Technologies, Inc. PA | Professional & Technical Services | 212 | $109,185 | - |
| Mastech InfoTrellis, Inc. PA | Professional & Technical Services | 2 | $112,778 | - |
| Mastek INC TX | Professional & Technical Services | 24 | $132,927 | - |
| Master - Bilt Products MS | - | 0 | - | - |
| Master Boat Builders AL | Manufacturing | 0 | - | F |
| Master Brand Home Products, LLC TX | - | 0 | - | - |
| Master Builders Solutions Construction Systems US LLC MI | Manufacturing | 0 | - | - |
| Master Chemical Corporation OH | Manufacturing | 1 | $178,000 | C |
| Master Compliance, Inc. TX | Professional & Technical Services | 10 | $88,616 | - |
| Master Concessionair, LLC FL | - | 0 | - | - |
| Master Construction Co. Inc ND | Construction | 0 | - | F |
| Master Craft Boats TN | Manufacturing | 0 | - | C |
| Master Elite Spice INC MD | Manufacturing | 0 | - | C |
| Master Engineering Inc KY | Manufacturing | 0 | - | F |
| Master Extrusion AL | Manufacturing | 0 | - | F |
| Master Finish Company MI | Manufacturing | 0 | - | F |
| Master Forwarding Network, Inc. CA | Professional & Technical Services | 1 | $75,255 | - |
| Master Guard IN | - | 0 | - | - |
| Master Halco IL | Manufacturing | 0 | - | F |
| Master Halco PA | - | 0 | - | - |
| Master Informatix Systems, Inc. VA | Professional & Technical Services | 1 | $118,456 | - |
