| Mastronardi Produce Inc. ME | Agriculture & Forestry | 0 | — | F |
| Mastronardi Produce USA TX | Wholesale Trade | 0 | — | C |
| Mastronardi Produce-USA, INC. KY | Agriculture & Forestry | 0 | — | A |
| Masu Sushi and Robata MOA MN | — | 0 | — | — |
| Masu Sushi Apple Valley MN | — | 0 | — | — |
| Masuda, Funai, Eifert & Mitchell, Ltd. IL | Professional & Technical Services | 1 | $136,677 | — |
| Masur Trucking Inc OH | Transportation & Warehousing | 0 | — | A |
| Masyan Express, Inc TN | Transportation & Warehousing | 0 | — | B |
| MASYER CORP TX | Construction | 0 | — | A |
| MAT Asphalt IL | Manufacturing | 0 | — | A |
| MAT CV Braking Components, LLC CA | Manufacturing | 0 | — | A |
| MAT CV Braking Components, LLC TX | Manufacturing | 0 | — | D |
| MAT HD, LLC GA | Manufacturing | 0 | — | F |
| MAT Holdings Inc CA | Transportation & Warehousing | 0 | — | B |
| MAT Holdings Inc. IL | Management of Companies | 0 | — | B |
| Mat Holdings Inc. - GRIE IL | Wholesale Trade | 0 | — | F |
| MAT Holdings, Inc TN | Manufacturing | 0 | — | F |
| MAT Holdings, Inc. OK | Transportation & Warehousing | 0 | — | B |
| MAT Holdings, Inc. TX | Transportation & Warehousing | 0 | — | A |
| MAT Parcel Express, Inc CA | Transportation & Warehousing | 0 | — | B |
| Mat-Su Borough School District AK | Educational Services | 0 | — | C |
| Mat-Su Valley III, LLC AK | Healthcare & Social Assistance | 1 | $625,000 | — |
| MATACHICA LLC CA | Transportation & Warehousing | 2 | $259,650 | — |
| Mataci Designs Inc. NJ | Manufacturing | 0 | — | F |
| Matador Instrument & Electrical TX | Mining & Extraction | 0 | — | A |
| Matagrano Inc. CA | Wholesale Trade | 0 | — | F |
| Matalco IN | Manufacturing | 0 | — | F |
| Matalco WI | Manufacturing | 0 | — | F |
| Matalco (U.S.), Inc. KY | Manufacturing | 0 | — | F |
| Matalco Inc KY | Manufacturing | 0 | — | A |
| Matalco Inc. OH | Manufacturing | 0 | — | F |
| Matalco USA, LLC OH | Manufacturing | 0 | — | F |
| MATAMOROS MEAT MARKET TX | Wholesale Trade | 0 | — | A |
| Matandy Steel OH | Wholesale Trade | 0 | — | A |
| Matanuska Electric Association AK | Utilities | 0 | — | F |
| Matanuska Susitna Borough AK | Public Administration | 0 | — | C |
| Matanuska Telecom Association, Inc. AK | Information & Media | 0 | — | F |
| Matanuska-susitna Borough Employee's Association AK | Public Administration | 0 | — | F |
| Matanuska-Susitna Borough School District AK | Educational Services | 0 | — | C |
| Match Group Americas, LLC TX | Professional & Technical Services | 5 | $166,534 | — |
| Match Group LLC TX | Professional & Technical Services | 6 | $165,917 | — |
| MATCH POINT SOLUTIONS CA | Professional & Technical Services | 1 | $130,000 | — |
| Matchbook Services, Inc. CA | Professional & Technical Services | 1 | $87,000 | — |
| Matchless Concrete Construction LLC SC | Construction | 0 | — | A |
| Matco Service Corp NY | Construction | 0 | — | F |
| Matco Tools NY | Manufacturing | 0 | — | F |
| Matco Tools Corporation OH | Manufacturing | 1 | $122,221 | — |
| MATCON DIAMOND INC. PA | Construction | 0 | — | A |
| Matcor Inc WY | Construction | 0 | — | A |
| Matcor Inc. LA | Construction | 0 | — | A |
