| Mack Technologies MA | Manufacturing | 1 | $125,000 | — |
| Mack Technologies Florida, Inc. FL | Manufacturing | 0 | — | C |
| Mack Trucks Lehigh Valley Operations PA | Manufacturing | 0 | — | F |
| Mack Trucks RVO VA | Manufacturing | 0 | — | A |
| Mack Trucks, Inc. NC | Manufacturing | 5 | $105,267 | — |
| Mack Trucks, Inc. PA | — | 0 | — | — |
| Mack's Inc. OH | Retail Trade | 0 | — | F |
| Mackay Communications, Inc. NC | Other Services | 1 | $90,002 | — |
| MacKay Manufacturing WA | Manufacturing | 0 | — | F |
| Mackenthun's Supermarket Inc MN | Retail Trade | 0 | — | C |
| MacKenzie Group Inc. NJ | Construction | 0 | — | F |
| Mackenzie LLC CA | Healthcare & Social Assistance | 0 | — | F |
| MacKenzie Painting Company/The MacKenzie Co LLC CT | Construction | 0 | — | F |
| MacKenzie Restoration Co, LLC CT | Construction | 0 | — | D |
| MacKenzie Service Corporation CT | Construction | 0 | — | F |
| Mackenzie Simon Enterprises LLC AR | Retail Trade | 0 | — | A |
| Mackenzie-Childs, LLC. NY | Transportation & Warehousing | 0 | — | A |
| Mackey Electric, Inc. NY | Construction | 0 | — | A |
| MACKEY LUMBER CO., INC. GA | Retail Trade | 0 | — | C |
| Mackinac County Road Commission MI | Construction | 0 | — | A |
| Mackinac Island Ferry Company MI | Transportation & Warehousing | 0 | — | F |
| Mackintosh Academy Littleton LLC CO | Educational Services | 1 | $49,480 | — |
| Macksteel Warehouse, Inc. SD | Wholesale Trade | 0 | — | F |
| Maclan Corporation FL | Manufacturing | 0 | — | F |
| Maclan Polyurethan & Rubber Products, LLC FL | Manufacturing | 0 | — | F |
| Maclean Fogg MI | Manufacturing | 0 | — | F |
| MacLean Fogg PA | Manufacturing | 0 | — | F |
| Maclean Fogg WI | Manufacturing | 0 | — | B |
| Maclean Master LLC MI | Manufacturing | 0 | — | F |
| MacLean Power - Trenton, LLC TN | Manufacturing | 0 | — | A |
| MACLEAN POWER SYSTEMS AL | — | 0 | — | — |
| MacLean Power Systems SC | Manufacturing | 0 | — | C |
| MacLean Power, LLC IL | Manufacturing | 0 | — | F |
| MacLean Power, LLC SC | Administrative & Waste Services | 0 | — | A |
| Maclean-Curtis NC | Manufacturing | 0 | — | F |
| MacLean-Fogg IL | Manufacturing | 0 | — | F |
| Maclean-Fogg MI | Manufacturing | 0 | — | F |
| MacLean-Fogg NY | Manufacturing | 0 | — | A |
| MacLean-Fogg WI | Manufacturing | 0 | — | F |
| Maclean-Fogg (Metform) IL | Manufacturing | 0 | — | D |
| MacLean-Fogg a MacLean-Fogg Company IL | Manufacturing | 0 | — | F |
| MacLean-fogg Engineered Solutions LLC MI | Manufacturing | 0 | — | F |
| MacLean-Master LLC MI | Manufacturing | 0 | — | C |
| Maclean-Maynard MI | Manufacturing | 0 | — | C |
| MacLellan Concrete Co., Inc. MA | Manufacturing | 0 | — | F |
| MacLellan Integrated Services AL | Administrative & Waste Services | 0 | — | B |
| MacLellan Integrated Services AZ | Administrative & Waste Services | 0 | — | A |
| MacLellan Integrated Services IL | Administrative & Waste Services | 0 | — | B |
| MacLellan Integrated Services IN | Administrative & Waste Services | 0 | — | B |
| MacLellan Integrated Services KY | Administrative & Waste Services | 0 | — | C |
