| Maersk NJ | Transportation & Warehousing | 0 | — | B |
| Maersk OH | Transportation & Warehousing | 0 | — | A |
| Maersk SC | Transportation & Warehousing | 0 | — | A |
| Maersk TN | Transportation & Warehousing | 0 | — | A |
| Maersk TX | Transportation & Warehousing | 0 | — | C |
| Maersk UT | Transportation & Warehousing | 0 | — | D |
| Maersk VA | Transportation & Warehousing | 0 | — | A |
| Maersk WA | Transportation & Warehousing | 0 | — | C |
| Maersk Agency U.S.A. Inc. NJ | Transportation & Warehousing | 1 | $135,000 | — |
| Maersk Logistics & Services USA Inc. NJ | Transportation & Warehousing | 4 | $94,853 | — |
| Maersk Oil Houston TX | — | 0 | — | — |
| Maersk Warehousing & Distribution Services USA LLC CA | — | 0 | — | — |
| Maes Solutions INC NJ | Professional & Technical Services | 1 | $85,634 | — |
| Maesa LLC NY | Administrative & Waste Services | 2 | $143,500 | — |
| Maestro Food Co IL | Manufacturing | 0 | — | F |
| Maestro Food Co UT | Manufacturing | 0 | — | F |
| MAESTRO MUSICIANS, LLC MA | Educational Services | 1 | $85,634 | — |
| Maestro Soccer, LLC NJ | Educational Services | 1 | $51,771 | — |
| MAESTRO TECHNOLOGIES INC. NJ | Professional & Technical Services | 8 | $143,625 | — |
| Maestro-Connections Health Systems, LLC MA | Healthcare & Social Assistance | 0 | — | A |
| Maeystown Rural Fire Protection District IL | Public Administration | 0 | — | A |
| Mafco Worldwide LLC NJ | Manufacturing | 0 | — | A |
| Maffei Structural Engineering CA | Professional & Technical Services | 1 | $82,000 | — |
| MAFFUCCI STORAGE CORP. NY | Transportation & Warehousing | 0 | — | F |
| MAG Aerospace Industries, LLC CA | Manufacturing | 2 | $138,005 | — |
| MAG Brand Group, LLC CA | — | 0 | — | — |
| MAG DS Cor NC | Transportation & Warehousing | 0 | — | A |
| MAG DS Corp AL | Transportation & Warehousing | 0 | — | A |
| MAG DS Corp FL | Manufacturing | 0 | — | F |
| MAG DS Corp MD | Transportation & Warehousing | 0 | — | A |
| MAG DS Corp NC | Transportation & Warehousing | 0 | — | A |
| MAG Industries, LLC CA | — | 0 | — | — |
| Mag Instrument, Inc. CA | Manufacturing | 0 | — | F |
| MAG Motors Monroe WI | Retail Trade | 0 | — | A |
| Mag Parts Inc. dba CPP-Azusa CA | — | 0 | — | — |
| MAG Retail Group IA | — | 0 | — | — |
| MAG Retail Group OR | — | 0 | — | — |
| Mag Specialties Inc. CO | Manufacturing | 1 | $175,250 | — |
| MAG USA Inc TN | Manufacturing | 0 | — | A |
| Mag-tec Casting Corp. MI | Manufacturing | 0 | — | F |
| Maganti Group LLC CT | Professional & Technical Services | 1 | $95,680 | — |
| Maganti IT Resources LLC CT | Professional & Technical Services | 8 | $110,500 | — |
| Magba, Emmanuel, Diana,Abdul(Media Enterprises, LLC) OH | Healthcare & Social Assistance | 2 | $41,974 | — |
| Magbee Bros. Lumber & Supply Co. GA | Retail Trade | 0 | — | C |
| Magbee Bros. Lumber and Supply GA | Retail Trade | 0 | — | F |
| Magbee Brothers Lumber and Supply Company LLC GA | Retail Trade | 0 | — | C |
| Magdalen House TX | Healthcare & Social Assistance | 0 | — | A |
| Magdelena Services MN | — | 0 | — | — |
| Magdelena Services 2020 MN | — | 0 | — | — |
| Mage Electrical Contractors NY | Construction | 0 | — | A |
