| National Magnetics Group, Inc. PA | Manufacturing | 0 | — | F |
| National Maintenance & Repair, Inc. IL | Transportation & Warehousing | 1 | $83,013 | — |
| National Management Resources AL | Administrative & Waste Services | 0 | — | A |
| National Management Resources AR | Administrative & Waste Services | 0 | — | A |
| National Management Resources DE | Administrative & Waste Services | 0 | — | A |
| National Management Resources FL | Administrative & Waste Services | 0 | — | A |
| National Management Resources GA | Administrative & Waste Services | 0 | — | A |
| National Management Resources IL | Administrative & Waste Services | 0 | — | A |
| National Management Resources IN | Administrative & Waste Services | 0 | — | A |
| National Management Resources KY | Administrative & Waste Services | 0 | — | A |
| National Management Resources LA | Administrative & Waste Services | 0 | — | D |
| National Management Resources MI | Administrative & Waste Services | 0 | — | A |
| National Management Resources NC | Administrative & Waste Services | 0 | — | A |
| National Management Resources NE | Administrative & Waste Services | 0 | — | A |
| National Management Resources NJ | Administrative & Waste Services | 0 | — | A |
| National Management Resources PA | Administrative & Waste Services | 0 | — | A |
| National Management Resources SD | Administrative & Waste Services | 0 | — | A |
| National Management Resources TN | Administrative & Waste Services | 0 | — | A |
| National Management Resources VA | Administrative & Waste Services | 0 | — | A |
| National Management Resources WV | Administrative & Waste Services | 0 | — | C |
| National Management Resources Concordia University IL | Administrative & Waste Services | 0 | — | A |
| National Management Resources Home Office GA | Administrative & Waste Services | 0 | — | F |
| National Management Resources Mercer Atlanta University GA | Administrative & Waste Services | 0 | — | A |
| National Marker Company RI | Manufacturing | 0 | — | F |
| National Marker Company (NMC) RI | — | 0 | — | — |
| National Marrow Donor Program MN | Healthcare & Social Assistance | 15 | $139,819 | — |
| National Material LP IL | Wholesale Trade | 0 | — | B |
| National Material LP IN | Wholesale Trade | 0 | — | A |
| National Materials, Heidtman Steel MI | Manufacturing | 0 | — | F |
| National Materials, Heidtman Steel OH | Manufacturing | 0 | — | A |
| National Medical Care Inc., a Fresenius Medical Care N.A. Company MA | Healthcare & Social Assistance | 9 | $139,458 | — |
| National Medical Care, Inc. a Fresenius Medical Care N.A. Company MA | Healthcare & Social Assistance | 5 | $133,962 | — |
| NATIONAL MENTOR LLC MN | Healthcare & Social Assistance | 4 | $130,843 | — |
| National Metal Processing, Inc. KY | Manufacturing | 0 | — | A |
| National Metal Stampings Inc CA | Manufacturing | 0 | — | F |
| National Metalwares L.P. IL | Manufacturing | 0 | — | A |
| National Metering & Technical Services, LLC WA | Construction | 0 | — | F |
| National Micro Rentals, Inc NJ | — | 0 | — | — |
| National Minority Quality Forum Inc. DC | Professional & Technical Services | 1 | $173,763 | — |
| National Molding, LLC PA | — | 0 | — | — |
| National Museum of Mathematics NY | Arts & Entertainment | 0 | — | C |
| National Museum of Nuclear Science & History NM | Arts & Entertainment | 0 | — | F |
| National Museum of the Mighty Eighth Air Force GA | Arts & Entertainment | 0 | — | F |
| National Network Services, LLC TN | Construction | 0 | — | A |
| National Nonwovens MA | Manufacturing | 0 | — | F |
| National Novelty Brush Company PA | Manufacturing | 0 | — | D |
| National Oak Distributors AZ | Wholesale Trade | 0 | — | A |
| National Oak Distributors CA | Wholesale Trade | 0 | — | D |
| National Oak Distributors CO | Wholesale Trade | 0 | — | A |
| National Oak Distributors CT | Wholesale Trade | 0 | — | F |
