| M MD | Administrative & Waste Services | 0 | — | C |
| M OH | Wholesale Trade | 0 | — | B |
| M & A Electric Power Cooperative MO | Utilities | 0 | — | D |
| M & B Asphalt Co., Inc. OH | Manufacturing | 0 | — | C |
| M & B HOLDINGS LLC IA | Professional & Technical Services | 0 | — | — |
| M & B HOLDINGS LLC MI | Professional & Technical Services | 0 | — | A |
| M & B HOLDINGS LLC NC | Professional & Technical Services | 0 | — | A |
| M & B HOLDINGS LLC OH | Professional & Technical Services | 0 | — | A |
| M & C Concrete Company IN | Construction | 0 | — | F |
| M & C Enterprise VA | Transportation & Warehousing | 0 | — | C |
| M & C Investment Group LLC CA | Accommodation & Food Services | 0 | — | A |
| M & E Mfg. Co., Inc. NY | Manufacturing | 0 | — | F |
| M & G Farms Inc WA | Agriculture & Forestry | 0 | — | F |
| M & G Polymers USA LLC WV | — | 0 | — | — |
| M & H Building Specialties NV | Construction | 0 | — | F |
| M & H Concrete Contractors, Inc. MO | Construction | 0 | — | C |
| M & J Explosives LLC PA | Construction | 0 | — | D |
| M & K TECHNOVATIONS, INC. PA | Professional & Technical Services | 1 | $108,000 | — |
| M & L INDUSTRIES, LLC. LA | Wholesale Trade | 0 | — | A |
| M & L PLUMBING CO INC CA | Construction | 0 | — | F |
| M & L Ventures Inc MO | Professional & Technical Services | 1 | $83,200 | — |
| M & M Coastal Manufacturing, Inc. TX | Manufacturing | 0 | — | F |
| M & M Electric Inc NV | Construction | 0 | — | F |
| M & M Excavating Company MI | Construction | 0 | — | F |
| M & M Fuels Inc CA | Retail Trade | 0 | — | A |
| M & M Glass, LLC NY | Construction | 0 | — | F |
| M & M Heating and Cooling OH | Construction | 0 | — | C |
| M & M Manufacturing, Inc. TX | — | 0 | — | — |
| M & M Precision Machining Inc MN | Manufacturing | 0 | — | F |
| M & M Quality Grinding Inc IL | Wholesale Trade | 0 | — | A |
| M & M Restaurant Supply OH | — | 0 | — | — |
| M & M Services Inc CA | Administrative & Waste Services | 0 | — | F |
| M & M Sheet Metal & Rain Gutter Corp. CA | Manufacturing | 0 | — | F |
| M & M TRUCKING CO., INC. AL | Transportation & Warehousing | 0 | — | A |
| M & M Woodworking TN | Manufacturing | 0 | — | F |
| M & N Dental Management, LLC. TX | Healthcare & Social Assistance | 2 | $200,000 | — |
| M & N Metals, Inc TX | Wholesale Trade | 0 | — | A |
| M & N Structures, Inc MN | Manufacturing | 0 | — | F |
| M & O Door Products, LLC NE | Construction | 0 | — | A |
| M & O Metals, Inc. NE | Construction | 0 | — | A |
| M & P Transport Company AZ | Transportation & Warehousing | 0 | — | B |
| M & R contracting, Inc. PA | Construction | 0 | — | A |
| M & S Grocery Inc WA | Retail Trade | 0 | — | B |
| M & S Paving and Sealing, Inc. CT | Construction | 0 | — | F |
| M & T Bank NJ | — | 0 | — | — |
| M & T Enterprises VA | Accommodation & Food Services | 0 | — | A |
| M & T ENTERPRISES, INC. WI | Retail Trade | 0 | — | F |
| M & W Construction Enterprises, LLC OH | Construction | 0 | — | F |
| M & W Drilling LLC TN | Construction | 0 | — | F |
| M & W Engineers and Constructors, Inc MS | Construction | 0 | — | C |
