| Montana Construction Corp Inc NJ | Construction | 0 | — | F |
| Montana Department of Justice MT | Public Administration | 0 | — | C |
| MONTANA DIRT WORKS LLC MT | Construction | 0 | — | A |
| Montana Everquest LLC MT | Accommodation & Food Services | 0 | — | A |
| Montana Fabrication Works, LLC MT | Manufacturing | 0 | — | F |
| Montana Frontier Sandstone MT | Mining & Extraction | 0 | — | F |
| Montana Gift Corral MT | Transportation & Warehousing | 0 | — | F |
| Montana Instruments MT | Manufacturing | 0 | — | A |
| Montana Linen Supply, LLC MT | Other Services | 0 | — | F |
| Montana Precision Products MT | Manufacturing | 0 | — | F |
| Montana Rail Link MT | Construction | 0 | — | F |
| Montana Reclaimed Lumber Co. MT | Wholesale Trade | 0 | — | F |
| Montana Rescue Mission MT | Healthcare & Social Assistance | 0 | — | F |
| Montana Rockworks MT | Manufacturing | 0 | — | F |
| Montana Specialty Mills LLC MT | Manufacturing | 0 | — | F |
| Montana State University MT | Educational Services | 13 | $64,654 | — |
| Montana Steakburgers LLC KS | Accommodation & Food Services | 0 | — | A |
| Montana Sulphur & Chemical Co MT | Manufacturing | 0 | — | F |
| Montana Technological University, which is part of The University of Montana MT | Educational Services | 5 | $68,140 | — |
| Montana Timber Products ID | Manufacturing | 0 | — | D |
| Montana West Inc. TX | Wholesale Trade | 1 | $52,000 | — |
| MONTANO CONCRETE CORP CO | Construction | 0 | — | F |
| Montanosa Restoration LLC NY | Construction | 0 | — | A |
| Montante Companies NY | Construction | 0 | — | A |
| Montante Group NY | Real Estate | 0 | — | A |
| Montaplast of North America Inc KY | Manufacturing | 0 | — | F |
| MONTARA MEADOWS NV | Healthcare & Social Assistance | 0 | — | F |
| Montauk Student Transport, LLC NY | — | 0 | — | — |
| Montaze Broz s.r.o. CA | Construction | 0 | — | A |
| Montaze Broz s.r.o. GA | Construction | 0 | — | A |
| Montaze Broz s.r.o. IL | Construction | 0 | — | A |
| Montaze Broz s.r.o. PA | Construction | 0 | — | A |
| Montaze Broz s.r.o. SC | Construction | 0 | — | A |
| Montaze Broz s.r.o. TX | Construction | 0 | — | A |
| Montbleu Resort Casino & Spa NV | — | 0 | — | — |
| Montcalm Care Network MI | Healthcare & Social Assistance | 0 | — | F |
| Montcalm County Road Commission MI | Construction | 0 | — | F |
| Montcare@Montgomery Village Health Care Center MD | Healthcare & Social Assistance | 0 | — | F |
| Montclair Ambulance Unit NJ | Healthcare & Social Assistance | 0 | — | F |
| Montclair Automotive Services, Inc. dba Infiniti of Ontario CA | — | 0 | — | — |
| Montclair Hotel Drive Operations MT | Accommodation & Food Services | 0 | — | A |
| Montclair State University NJ | Educational Services | 15 | $120,047 | — |
| MONTE CARLO DATA, INC. CA | Professional & Technical Services | 1 | $234,062 | — |
| Monte Nido & Affiliates CA | — | 0 | — | — |
| Monte Nido & Associates MD | — | 0 | — | — |
| Monte Vista Christian School CA | Educational Services | 0 | — | F |
| Monte Vista Cooperative CO | Retail Trade | 0 | — | C |
| Monte Vista Estates CO | Healthcare & Social Assistance | 0 | — | F |
| Monte Vista Farming Company LLC. CA | Agriculture & Forestry | 0 | — | C |
| Monte Vista Grove Homes CA | Healthcare & Social Assistance | 0 | — | F |
