| Mayo Northridge MN | - | 0 | - | - |
| Mayo Springfield Hospital & Clinic & Lamberton Clinic 2019 MN | - | 0 | - | - |
| Mayo St. James MN | - | 0 | - | - |
| Mayo Waseca MN | - | 0 | - | - |
| Mayo4Sam LLC dba P.J. Sweeney's Restaurant & Pub NJ | - | 0 | - | - |
| Mayor and City Council of Baltimore MD | - | 1 | $120,141 | - |
| Mayoral Brothers Inc. CA | Agriculture & Forestry | 0 | - | F |
| Mayrich Construction Corp. NY | - | 0 | - | - |
| Mayrich Equipment Corp. NY | - | 0 | - | - |
| Mayrich Foundation Company LLC NY | - | 0 | - | - |
| Maysteel SC | - | 0 | - | - |
| Maysteel WI | Manufacturing | 0 | - | F |
| Maysteel LLC NC | - | 0 | - | - |
| Mayura Technologies LLC GA | - | 1 | $82,971 | - |
| Mayville Engineering Company AR | Manufacturing | 0 | - | F |
| Mayville Engineering Company SC | - | 0 | - | - |
| Mayville Engineering Company WI | Manufacturing | 0 | - | F |
| Mayville Engineering Company, Inc. PA | Manufacturing | 0 | - | F |
| Mayville Engineering Company. Inc. MI | Manufacturing | 0 | - | F |
| Mayville Engineering Company. Inc. VA | Manufacturing | 0 | - | F |
| Maywood Acres Healthcare CA | Healthcare & Social Assistance | 0 | - | F |
| Maywood Farms CA | Agriculture & Forestry | 0 | - | - |
| Maywood L'Chaim dba Cookies Los Angeles CA | - | 0 | - | - |
| Maywood Physical Therapy LLC NJ | Healthcare & Social Assistance | 1 | $125,000 | - |
| Maz Design LLC NJ | Professional & Technical Services | 3 | $140,000 | - |
| Mazak Corporation Florence Kentucky KY | Manufacturing | 0 | - | D |
| Mazanec, Bauer & Associates, P.L.C. MN | Professional & Technical Services | 1 | $57,200 | - |
| Mazar Space LLC - Leghorn CA | - | 0 | - | - |
| Mazarine New York, LLC NY | Professional & Technical Services | 1 | $114,379 | - |
| Mazda Motors Of America, Inc. CA | - | 0 | - | - |
| Mazda Toyota Manufacturing Inc AL | Manufacturing | 0 | - | F |
| Mazda Toyota Mfg. U.S.A., Inc. AL | Manufacturing | 0 | - | F |
| Maze & Associates Accounting Corporation CA | Professional & Technical Services | 1 | $97,500 | - |
| Maze Consulting LLC NY | Professional & Technical Services | 1 | $188,000 | - |
| Maze Therapeutics Inc. CA | Professional & Technical Services | 3 | $175,916 | - |
| Mazopiya MN | - | 0 | - | - |
| Mazza Recycling Services Ltd. NJ | Administrative & Waste Services | 0 | - | F |
| Mazzei Injector Company, LLC CA | - | 1 | $100,000 | - |
| Mazzetti, Inc. CA | Professional & Technical Services | 5 | $81,600 | - |
| MB Acquisition Inc WI | Manufacturing | 0 | - | B |
| MB Acquisitions Inc IL | Manufacturing | 0 | - | F |
| MB Acquisitions Inc MN | Manufacturing | 0 | - | F |
| MB Companies Inc WI | Manufacturing | 0 | - | F |
| MB Financial Bank KS | - | 0 | - | - |
| MB Financial Bank MI | - | 0 | - | - |
| MB Financial Bank NE | - | 0 | - | - |
| MB Haynes Corporation NC | Construction | 0 | - | C |
| MB IT Associates, LLC NJ | Professional & Technical Services | 25 | $110,012 | - |
| MB Structures OR | Construction | 0 | - | F |
| Mb Tech Micronesia, LLC MP | Construction | 2 | $58,698 | - |