| McLean Packaging Corp. PA | Manufacturing | 0 | — | F |
| McLendon Enterprises, Inc. GA | Construction | 0 | — | F |
| McLendon Hardware WA | Retail Trade | 0 | — | C |
| McLendon Trailers, LLC AL | Manufacturing | 0 | — | A |
| McLendon's WA | Retail Trade | 0 | — | D |
| McLeod Construction LLC WA | Construction | 0 | — | F |
| McLeod Cooperative Power MN | Utilities | 0 | — | A |
| McLeod County MN | Professional & Technical Services | 0 | — | F |
| McLeod Electric LA | Construction | 0 | — | A |
| MCLEOD EXPRESS, LLC IL | Transportation & Warehousing | 0 | — | C |
| McLeod General Trades, LLC FL | Construction | 0 | — | A |
| McLeod Health SC | Healthcare & Social Assistance | 0 | — | C |
| McLeod Machine Works Inc. TX | Manufacturing | 0 | — | A |
| McLeod Regional Medical Center of the Pee Dee, Inc. SC | Healthcare & Social Assistance | 2 | $266,573 | — |
| McLeod Software Corporation AL | Professional & Technical Services | 0 | — | A |
| McLeRoy Equipment LLC GA | Construction | 0 | — | F |
| McLiney Lumber & Supply LLC KS | Professional & Technical Services | 0 | — | A |
| McLoone Metal Graphics WI | Manufacturing | 0 | — | A |
| MCM Acquisition Company Inc AL | Manufacturing | 0 | — | A |
| MCM Electronics Inc OH | — | 0 | — | — |
| MCM Harvesters, Inc CA | Agriculture & Forestry | 0 | — | D |
| MCM Ind. Co., Inc OH | Manufacturing | 0 | — | A |
| MCM Marine, Inc. MI | Construction | 0 | — | F |
| MCM Quality Systems, Inc. MI | Professional & Technical Services | 1 | $113,547 | — |
| MCM Roofing Company Inc. CA | Construction | 0 | — | A |
| MCM Technologies, Inc. RI | Manufacturing | 0 | — | A |
| McMahon Carriers Incorporated IL | Transportation & Warehousing | 0 | — | F |
| McMahon Contracting and Construction LLC. TX | Construction | 0 | — | F |
| MCMAHON MARTINE AND GALLAGHER LLP NY | Professional & Technical Services | 1 | $154,000 | — |
| McMahon Steel Company Inc. CA | Construction | 0 | — | C |
| McMahon Tire Service Inc. IN | Manufacturing | 0 | — | F |
| McMahon Transport Group LLC IL | Transportation & Warehousing | 0 | — | C |
| McMahon Trucks IN | Other Services | 0 | — | F |
| McMahon Trucks KY | Other Services | 0 | — | A |
| McMahon Trucks NC | Other Services | 0 | — | A |
| McMahon Trucks OH | Retail Trade | 0 | — | B |
| McMahon Trucks SC | Other Services | 0 | — | A |
| McMahon Trucks TN | Retail Trade | 0 | — | A |
| McMahon Trucks Indianapolis IN | Other Services | 0 | — | A |
| McManis Family Vineyards, Inc. CA | Manufacturing | 0 | — | F |
| McMaster & Hill Construction CA | Construction | 0 | — | A |
| McMaster-Carr Supply Company CA | Wholesale Trade | 0 | — | F |
| McMaster-Carr Supply Company GA | Wholesale Trade | 0 | — | F |
| McMaster-Carr Supply Company IL | Wholesale Trade | 0 | — | C |
| McMaster-Carr Supply Company NJ | Wholesale Trade | 0 | — | B |
| McMaster-Carr Supply Company OH | Wholesale Trade | 0 | — | C |
| McMellon Bros., Inc. CT | Manufacturing | 0 | — | A |
| McMenamin Family ShopRite INC PA | Retail Trade | 0 | — | D |
| McMichael Mills, Inc. NC | — | 0 | — | — |
| McMillan Data Communications CA | Construction | 0 | — | F |
