| M.H. Eby, Inc. OH | Manufacturing | 0 | - | F |
| M.H. Eby, Inc. PA | Manufacturing | 0 | - | F |
| M.I. Industries, Inc. MO | Manufacturing | 1 | $125,986 | - |
| M.J. Soffe LLC NC | - | 0 | - | - |
| M.L. McDonald Sales Company, LLC MA | Construction | 0 | - | D |
| M.L. Ruberton Construction Co., Inc. NJ | Construction | 0 | - | F |
| M.R. Williams, Inc. NC | Wholesale Trade | 0 | - | F |
| M.S. Aerospace, Inc. CA | Manufacturing | 1 | $95,618 | - |
| M.S. Ambrogio North America, LLC ME | Manufacturing | 0 | - | F |
| M.S.N. Inc. (McDugald Steele, Stirling Electric & Waterline Designs) TX | Administrative & Waste Services | 0 | - | F |
| M/A-Com Technology Solutions CA | - | 0 | - | - |
| M/A/R/C Inc. TX | Professional & Technical Services | 1 | $120,000 | - |
| M1 Support Services AL | Transportation & Warehousing | 0 | - | B |
| M1 Support Services MS | Transportation & Warehousing | 0 | - | B |
| M1 Support Services NM | Transportation & Warehousing | 0 | - | F |
| M1 Support Services NV | Transportation & Warehousing | 0 | - | B |
| M1 Support Services TX | Transportation & Warehousing | 0 | - | C |
| M2 Federal, Inc. TX | Construction | 2 | $104,749 | - |
| M2 Services-Ft Hood TX | - | 0 | - | - |
| M2Catalyst, LLC CA | Information & Media | 1 | $170,000 | - |
| M2H2 Holdings LLC dba Claborn Manufacturing AL | Manufacturing | 0 | - | F |
| M2S Consulting LLC NJ | Professional & Technical Services | 1 | $70,000 | - |
| M2X Energy Inc. FL | Mining & Extraction | 1 | $180,000 | - |
| M3 Global INC TX | Professional & Technical Services | 1 | $95,139 | - |
| M3bi LLC AZ | Professional & Technical Services | 21 | $116,724 | - |
| M3F, Inc. UT | Finance & Insurance | 1 | $120,000 | - |
| M3iox LLC TX | Professional & Technical Services | 2 | $92,500 | - |
| M3sim LLC IN | Professional & Technical Services | 1 | $124,560 | - |
| M5 Delivery LLC AZ | Transportation & Warehousing | 0 | - | F |
| M56 LLC d/b/a Ma Peche NY | - | 0 | - | - |
| M6 Contracting, Inc. NC | Construction | 0 | - | F |
| M9 Consulting, Inc. TX | Professional & Technical Services | 12 | $112,852 | - |
| Ma AL | Manufacturing | 0 | - | F |
| MA Dog and Cat LLC MA | - | 0 | - | - |
| MA Laboratories, INC. CA | Wholesale Trade | 3 | $69,048 | - |
| MA Medina Farm Labor Services, Inc CA | Agriculture & Forestry | 0 | - | B |
| MA Technologies LLC TX | Professional & Technical Services | 1 | $112,923 | - |
| MA United Corp NJ | Professional & Technical Services | 1 | $115,918 | - |
| MA1 Logistics, Inc. CA | Transportation & Warehousing | 0 | - | F |
| MAAC Machinery Co, Inc IL | Manufacturing | 0 | - | F |
| Maagsoft INC NY | Professional & Technical Services | 2 | $99,549 | - |
| Maakay Group, LLC MD | Administrative & Waste Services | 1 | $78,146 | - |
| Maantic, Inc. CA | Professional & Technical Services | 14 | $157,786 | - |
| Maas Energy Works, LLC CA | Manufacturing | 1 | $75,000 | A |
| Maas Nursery, INC. TX | Retail Trade | 0 | - | F |
| Maaschhoff's NE | - | 0 | - | - |
| Maass Corporation SPC CA | Retail Trade | 0 | - | F |
| Maax Bath AZ | Manufacturing | 0 | - | F |
| Maax Spa IA | Manufacturing | 0 | - | F |
| Maayee, Inc. GA | Professional & Technical Services | 8 | $102,440 | - |
