| M.R. Williams, Inc. NC | Wholesale Trade | 0 | — | F |
| M.R. Williams, Inc. VA | Wholesale Trade | 0 | — | A |
| M.S. Aerospace, Inc. CA | Manufacturing | 1 | $95,618 | — |
| M.S. Ambrogio North America, LLC ME | Manufacturing | 0 | — | F |
| M.S. Company MA | Manufacturing | 0 | — | C |
| M.S. Rau, LLC LA | Retail Trade | 0 | — | A |
| M.S.N. Inc. (McDugald Steele, Stirling Electric & Waterline Designs) TX | Administrative & Waste Services | 0 | — | F |
| M.T. Carter Contracting, LLC VA | Construction | 0 | — | A |
| M.T. Laney Company Inc MD | Construction | 0 | — | C |
| M.Torres America, Inc. WA | Professional & Technical Services | 0 | — | A |
| M.U.E. MI | Utilities | 0 | — | B |
| M.V.P. Construction Co., Inc. NY | Construction | 0 | — | A |
| M.W. Johnson Enterprises LLC GA | Construction | 0 | — | A |
| M.W. Morss, Inc. MI | Construction | 0 | — | A |
| M.W., INC. MI | Retail Trade | 0 | — | A |
| M.Z.L. Home Care Agency, LLC NY | Healthcare & Social Assistance | 0 | — | F |
| M/A-Com Technology Solutions CA | — | 0 | — | — |
| M/A/R/C Inc. TX | Professional & Technical Services | 1 | $120,000 | — |
| M/J Feedmill MS LLC MS | Manufacturing | 0 | — | A |
| M001 SD | Agriculture & Forestry | 0 | — | A |
| M007 SD | Agriculture & Forestry | 0 | — | A |
| M1 Support Services AL | Transportation & Warehousing | 0 | — | B |
| M1 Support Services CA | Transportation & Warehousing | 0 | — | A |
| M1 Support Services FL | Transportation & Warehousing | 0 | — | A |
| M1 Support Services IL | Transportation & Warehousing | 0 | — | F |
| M1 Support Services MO | Transportation & Warehousing | 0 | — | C |
| 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 SD | Transportation & Warehousing | 0 | — | F |
| M1 Support Services TX | Transportation & Warehousing | 0 | — | C |
| M1 Support Services VA | Transportation & Warehousing | 0 | — | C |
| M2 Farming CA | Agriculture & Forestry | 0 | — | C |
| M2 Federal, Inc. TX | Construction | 2 | $104,749 | — |
| M2 Global Technology, Ltd. TX | Manufacturing | 0 | — | A |
| M2 Services-Ft Hood TX | — | 0 | — | — |
| M2Catalyst, LLC CA | Information & Media | 1 | $170,000 | — |
| M2Construction LLC PA | Construction | 0 | — | D |
| M2H2 Holdings LLC dba Claborn Manufacturing AL | Manufacturing | 0 | — | F |
| M2M On Track FL | Transportation & Warehousing | 0 | — | C |
| M2S Consulting LLC NJ | Professional & Technical Services | 1 | $70,000 | — |
| M2X Energy Inc. FL | Mining & Extraction | 1 | $180,000 | — |
| M2X Energy, Inc IA | Construction | 0 | — | F |
| M3 Chemical Solutions LLC. TX | Mining & Extraction | 0 | — | A |
| M3 Cleaning Services, Inc DBA Clean Care OH | Administrative & Waste Services | 0 | — | A |
| M3 Distribution, Inc. TX | Wholesale Trade | 0 | — | C |
| M3 Engineering and Technology AZ | Administrative & Waste Services | 0 | — | A |
| M3 Freight Solutions LLC NV | Transportation & Warehousing | 0 | — | F |
| M3 GLOBAL INC TX | Professional & Technical Services | 1 | $95,139 | — |
| M3 Port City Metal Products MI | Manufacturing | 0 | — | A |
