| Machine Solution Providers LLC IL | Manufacturing | 0 | — | D |
| Machine Spare Parts Remanufacture MI | Other Services | 0 | — | A |
| Machine Specialties LLC NC | Manufacturing | 2 | $88,941 | B |
| Machine Specialty & Manufacturing, Inc. LA | Manufacturing | 0 | — | C |
| Machine Tech Inc. LA | Manufacturing | 0 | — | A |
| Machine Tool Research NY | Manufacturing | 0 | — | C |
| Machine Zone, Inc. CA | — | 0 | — | — |
| Machine-Pro Technologies, Inc. OH | Manufacturing | 0 | — | A |
| Machined Metals Manufacturing PA | Manufacturing | 0 | — | D |
| machined products company PA | Manufacturing | 0 | — | A |
| Machinery Components, Inc. IL | Manufacturing | 0 | — | A |
| Machinery Maintenance, Inc IL | Manufacturing | 0 | — | F |
| Machinery Movers & Erectors, Inc. VA | Construction | 0 | — | A |
| Machinery Systems Inc IL | Wholesale Trade | 0 | — | B |
| Machinetek Corp OH | Manufacturing | 0 | — | A |
| Machinex Technologies Inc NC | Wholesale Trade | 0 | — | F |
| Machinify, Inc. CA | Professional & Technical Services | 9 | $191,436 | — |
| Machinima NU, LLC CA | — | 0 | — | — |
| Machinima, Inc. CA | — | 0 | — | — |
| Machining Concepts WI | Manufacturing | 0 | — | A |
| Machining Concepts Inc. PA | Manufacturing | 0 | — | F |
| Machining Technologies LLC MA | Manufacturing | 0 | — | A |
| Machinists, Inc. WA | Manufacturing | 0 | — | F |
| MACHINT SOLUTIONS, LLC IL | Professional & Technical Services | 1 | $108,080 | — |
| MachMotion LLC MO | Manufacturing | 1 | $88,754 | — |
| Machtrans,LLC FL | Transportation & Warehousing | 0 | — | A |
| MACHU PICCHU ENERGY LLC CA | Manufacturing | 4 | $169,275 | — |
| Machupicchu Restaurant LLC RI | Accommodation & Food Services | 1 | $67,496 | — |
| Macias Gini & O'Connell LLP CA | Professional & Technical Services | 12 | $100,676 | — |
| MacInnis Group, LLC PA | Manufacturing | 0 | — | F |
| MacIntosh Linen & Uniform, Inc. PA | Other Services | 0 | — | B |
| MacIntosh Linen and Uniform PA | — | 0 | — | — |
| Mack 520 AZ | Construction | 0 | — | F |
| Mack Contracting, LLC FL | Construction | 0 | — | A |
| Mack Energy Corporation NM | Agriculture & Forestry | 0 | — | D |
| Mack Engineering Corp MN | Manufacturing | 0 | — | F |
| Mack Group MA | Manufacturing | 0 | — | A |
| Mack Hils, Inc. MO | Manufacturing | 0 | — | A |
| Mack Industries FL | Manufacturing | 0 | — | F |
| Mack Industries MI | Manufacturing | 0 | — | F |
| Mack Industries NC | Manufacturing | 0 | — | D |
| Mack Industries OH | Manufacturing | 0 | — | F |
| MACK LOGISTICS LLC PA | Transportation & Warehousing | 0 | — | F |
| Mack Molding Company NC | Manufacturing | 0 | — | A |
| Mack Molding Company SC | Manufacturing | 0 | — | F |
| Mack Molding Company VT | Manufacturing | 0 | — | F |
| Mack Prototype, Inc MA | Professional & Technical Services | 0 | — | A |
| MACK SALES & SERVICE OF DECATUR, INC IL | Retail Trade | 0 | — | A |
| Mack Studios Displays NY | Manufacturing | 0 | — | F |
| Mack Studios, Inc. NY | Manufacturing | 0 | — | F |
