| Mt. Shasta Ambulance Service, Inc. CA | Healthcare & Social Assistance | 0 | — | D |
| Mt. Vernon Township High School IL | Educational Services | 0 | — | A |
| Mt. View Care Center NV | Healthcare & Social Assistance | 0 | — | F |
| Mt. View Farming, Inc. CA | Agriculture & Forestry | 0 | — | F |
| Mt. View Sanitary District CA | Utilities | 0 | — | A |
| Mt. West Research Center ID | — | 0 | — | — |
| Mt.Hood Forest Products LLC OR | Manufacturing | 0 | — | F |
| Mt.Pleasant Blacktopping OH | Construction | 0 | — | A |
| MTA CA | Transportation & Warehousing | 0 | — | A |
| MTA New York City Transit (TA) (and subsidiary, the Manhattan & Bronx Surface Transit Operating Authority) NY | — | 0 | — | — |
| MTAM ENTERPRISES LLC WV | Wholesale Trade | 0 | — | F |
| MTB Transport, LLC AL | Transportation & Warehousing | 0 | — | F |
| MTBR Enterprises, LLC AR | Administrative & Waste Services | 0 | — | F |
| MTC Facility MD | — | 0 | — | — |
| MTC Holsters MO | Manufacturing | 0 | — | A |
| MTC Hotel Associates, LLC NE | Accommodation & Food Services | 0 | — | F |
| MTC Management PLLC AZ | Professional & Technical Services | 2 | $72,966 | — |
| MTC Tulsa OK | Construction | 0 | — | A |
| MTCO Corporation IL | Information & Media | 0 | — | F |
| MTD OH | — | 0 | — | — |
| MTD Products INC AZ | Manufacturing | 0 | — | D |
| MTD Products Inc KY | — | 0 | — | — |
| MTD Products Inc TN | Manufacturing | 0 | — | F |
| MTD Products Inc. OH | Manufacturing | 0 | — | F |
| MTech Mechanical CO | Construction | 0 | — | A |
| MTech Mechanical Solutions Group, Inc. CO | Construction | 1 | $97,000 | — |
| MTH Family LLC CO | Agriculture & Forestry | 0 | — | F |
| MTH Industries IL | Construction | 0 | — | F |
| MTH Pumps IL | Manufacturing | 0 | — | D |
| Mthree Corporate Consulting Limited DE | Professional & Technical Services | 1 | $90,256 | — |
| MTI America FL | Professional & Technical Services | 0 | — | A |
| MTI Baths Inc GA | Manufacturing | 0 | — | F |
| MTI Motion WI | Manufacturing | 0 | — | C |
| MTI Motion (formerly PST) WI | Manufacturing | 0 | — | A |
| MTI Specialty Silicones Inc. FL | — | 0 | — | — |
| MTI-Milliren Technologies, Inc. MA | Manufacturing | 0 | — | A |
| MTIL, Inc IL | — | 0 | — | — |
| MTJ ELECTRIC AZ | Construction | 0 | — | A |
| MTL Construction Services INC. CA | Construction | 0 | — | F |
| MTL DESIGN, INC NY | Construction | 0 | — | A |
| MTLC LA | Retail Trade | 0 | — | A |
| MTM AZ | Transportation & Warehousing | 0 | — | B |
| MTM Inc. CA | Construction | 0 | — | A |
| MTM Molded Products Company OH | Manufacturing | 0 | — | A |
| MTM Recognition IL | Manufacturing | 0 | — | F |
| MTM Transit AZ | Transportation & Warehousing | 0 | — | A |
| MTM Transit CA | Transportation & Warehousing | 0 | — | A |
| MTM Transit CO | Transportation & Warehousing | 0 | — | A |
| MTM Transit DC | Transportation & Warehousing | 0 | — | A |
| MTM Transit FL | Transportation & Warehousing | 0 | — | A |
