| McMillan Electric CA | Construction | 0 | — | F |
| McMillan Electric Company WI | Manufacturing | 0 | — | F |
| McMillan Security Systems Inc CA | Construction | 0 | — | A |
| McMillen Enterprises Inc CA | Construction | 0 | — | F |
| McMillen, Inc. ID | Construction | 0 | — | A |
| McMinnville Inn OR | Accommodation & Food Services | 0 | — | A |
| McMinnville Manufacturing, LLC TN | Manufacturing | 0 | — | D |
| McMinnville Memory Care OR | Healthcare & Social Assistance | 0 | — | A |
| McMinnville School District OR | Educational Services | 0 | — | A |
| McMinnville School District #40 OR | Educational Services | 0 | — | A |
| McMinnville School District #40, Facilities and Operations OR | Educational Services | 0 | — | A |
| McMorrow Hospitality Group, Inc. NC | Transportation & Warehousing | 0 | — | B |
| McMullan Veterinary Services PA NC | Professional & Technical Services | 0 | — | A |
| McMurray Fabrics NC | Manufacturing | 0 | — | F |
| McMurrin Farms, LLC IA | Transportation & Warehousing | 0 | — | D |
| McMurry Construction Company TN | Construction | 0 | — | A |
| MCN Build, Inc. DC | Construction | 1 | $115,000 | D |
| MCN Operating, LLC TX | Manufacturing | 0 | — | A |
| McNairy Hospital Corporation TN | — | 0 | — | — |
| McNally Tunneling Corporation OH | Construction | 0 | — | A |
| McNally-Kiewit SST JV OH | Construction | 0 | — | F |
| McNally-Nimergood Co. MI | Construction | 0 | — | A |
| McNally/Kiewit SST JV OH | Construction | 0 | — | D |
| McNamara Contracting Inc MN | Construction | 0 | — | F |
| McNamara's WA | Accommodation & Food Services | 0 | — | D |
| McNamara-Salvia, Inc. MA | Professional & Technical Services | 2 | $80,000 | — |
| McNational, Inc. KY | Transportation & Warehousing | 0 | — | A |
| McNational, Inc. LA | Manufacturing | 0 | — | D |
| McNational, Inc. OH | Manufacturing | 0 | — | F |
| McNaughton-McKay Electric Company GA | Wholesale Trade | 0 | — | A |
| McNaughton-McKay Electric Company MI | Wholesale Trade | 0 | — | A |
| McNaughton-McKay Electric Company NC | Wholesale Trade | 0 | — | A |
| McNaughton-McKay Electric Company OH | Wholesale Trade | 0 | — | B |
| McNaughton-McKay Electric Company SC | Wholesale Trade | 0 | — | A |
| McNeal Professional Services, Inc. GA | Professional & Technical Services | 2 | $71,032 | — |
| McNeely Plastics Products MS | Manufacturing | 0 | — | D |
| McNeely Trucking NC | Transportation & Warehousing | 0 | — | A |
| McNeese Logistics LLC MI | Transportation & Warehousing | 0 | — | B |
| McNeese State University LA | Educational Services | 3 | $58,744 | — |
| McNeil Consumer Healthcare PA | — | 0 | — | — |
| McNeil Elder Services MA | Healthcare & Social Assistance | 0 | — | F |
| MCNEIL GROUP INC. OH | Manufacturing | 0 | — | D |
| McNeil Industrial, Inc. NE | Construction | 0 | — | A |
| McNeil Industries OH | Manufacturing | 0 | — | A |
| McNeill Hotel Holdings, LLC AL | Accommodation & Food Services | 0 | — | A |
| McNeill Hotel Holdings, LLC GA | Accommodation & Food Services | 0 | — | A |
| McNeill Hotel Holdings, LLC ID | Accommodation & Food Services | 0 | — | F |
| McNeill Hotel Holdings, LLC IN | Accommodation & Food Services | 0 | — | A |
| McNeill Hotel Holdings, LLC KS | Accommodation & Food Services | 0 | — | A |
| McNeill Hotel Holdings, LLC MS | Accommodation & Food Services | 0 | — | A |
