| Maine Veterans' Homes ME | Healthcare & Social Assistance | 0 | — | F |
| Maine Veterans' Homes - Caribou ME | Healthcare & Social Assistance | 0 | — | F |
| Maine Water ME | Utilities | 0 | — | F |
| MAINE WEST HIGH SCHOOL - 05 | 1755 SOUTH WOLF ROAD IL | Educational Services | 0 | — | C |
| Maine Wood Turning, Inc. ME | Manufacturing | 0 | — | F |
| Maine Woods Company LLC ME | Manufacturing | 0 | — | A |
| Maine Woods Pellet Co LLC ME | Manufacturing | 0 | — | F |
| MaineGeneral Health ME | Healthcare & Social Assistance | 1 | $119,350 | F |
| MaineGeneral Medical Center ME | Healthcare & Social Assistance | 0 | — | F |
| MaineGeneral Rehab & Long Term Care ME | Healthcare & Social Assistance | 0 | — | F |
| MaineHealth ME | Healthcare & Social Assistance | 3 | $156,052 | F |
| MaineHealth Care at Home ME | Healthcare & Social Assistance | 0 | — | F |
| Mainelli Mechanical Contractors, Inc. NE | Construction | 0 | — | A |
| MAINELY VENTURES, INC NC | Retail Trade | 0 | — | A |
| Maines Paper & Food Service TX | — | 0 | — | — |
| Maines Paper & Food Service, Inc. MD | — | 0 | — | — |
| Maines Paper & Food Service, Inc. OH | — | 0 | — | — |
| Maines Paper and Food Service, Inc. TN | — | 0 | — | — |
| Mainframe Computer, Inc. FL | Professional & Technical Services | 1 | $200,000 | — |
| Mainfreight Inc. CA | Transportation & Warehousing | 2 | $115,000 | — |
| Maingate DSP, Inc FL | Transportation & Warehousing | 0 | — | F |
| Maini LLC GA | Professional & Technical Services | 2 | $140,000 | — |
| Mainland Logistics Inc. FL | Transportation & Warehousing | 0 | — | F |
| Mainline Information Systems LLC FL | Professional & Technical Services | 1 | $110,000 | — |
| Mainline Printing Inc KS | Manufacturing | 0 | — | A |
| Mainlining America, LLC NJ | Construction | 0 | — | F |
| Mainly Mozart, Inc. CA | Arts & Entertainment | 0 | — | A |
| Mainplace Post Acute CA | Healthcare & Social Assistance | 0 | — | F |
| Mains'l CA CA | Healthcare & Social Assistance | 0 | — | F |
| Mainscape, Inc. IN | Administrative & Waste Services | 0 | — | C |
| Mainsl CA CA | Healthcare & Social Assistance | 0 | — | A |
| Mainsl Financial Management Services, Inc. MN | Professional & Technical Services | 0 | — | A |
| Mainsl Services MN | Healthcare & Social Assistance | 0 | — | B |
| Mainspring Energy, Inc. CA | Manufacturing | 12 | $124,493 | C |
| Mainspring Management, LLC KS | Administrative & Waste Services | 1 | $120,000 | — |
| MAINSQUARE CO. CA | Information & Media | 1 | $113,630 | — |
| MainStage Theatrical Supply WI | Manufacturing | 0 | — | F |
| Mainstay Construction FL | Construction | 0 | — | A |
| Mainstay Entertainment LLC CA | Arts & Entertainment | 1 | $56,160 | — |
| Mainstream Electrical, Heating, Cooling, Plumbing WA | Construction | 0 | — | F |
| Mainstream Engineering Corporation FL | Professional & Technical Services | 0 | — | F |
| Mainstream Fiber Networks IN | Information & Media | 0 | — | F |
| Mainstream Packaging, Inc. KY | Manufacturing | 0 | — | A |
| MainStreet Work Inc. CA | Information & Media | 1 | $190,000 | — |
| Maintainer Corporation of Iowa IA | Manufacturing | 0 | — | F |
| MaintainX, Inc. CA | Professional & Technical Services | 2 | $185,000 | — |
| Maintco CA | Administrative & Waste Services | 0 | — | C |
| Maintco WA | Construction | 0 | — | A |
| Maintenance & Management Associates, Inc. NY | Administrative & Waste Services | 0 | — | F |
| Maintenance Inc. TX | Administrative & Waste Services | 0 | — | A |
