| MAMullet's Aluminum Products Inc | Sarasota | FL | 100–499 | ◐ LIKELY ACTIVE |
| MTMultimatic Tennessee, LLC | Lewisburg | TN | 100–499 | ◐ LIKELY ACTIVE |
| MIMultiMetal, Inc. | Greensburg | PA | 20–99 | ◐ LIKELY ACTIVE |
| MIMultiMetal Inc, dba Moore & Morford II | Greensburg | PA | 20–99 | ◐ LIKELY ACTIVE |
| Mmunster1501 | Hammond | IN | 20–99 | ◐ LIKELY ACTIVE |
| NCNativewest CORP | West Linn | OR | — | ◐ LIKELY ACTIVE |
| NNc01-yis | Jacksonville | NC | 1–19 | ◐ LIKELY ACTIVE |
| NNc03-yis | Jacksonville | NC | 1–19 | ◐ LIKELY ACTIVE |
| NCNc Carports and Garages LLC | Elkin | NC | — | ◐ LIKELY ACTIVE |
| NANew Albany, IN | New Albany | IN | 20–99 | ◐ LIKELY ACTIVE |
| NHNew Hudson Facades - Aston | Aston | PA | 1–19 | ◐ LIKELY ACTIVE |
| NHNew Hudson Facades - CA | Los Angeles | CA | 1–19 | ◐ LIKELY ACTIVE |
| NHNew Hudson Facades - DE | New Castle | DE | 1–19 | ◐ LIKELY ACTIVE |
| NHNew Hudson Facades - IL | Chicago | IL | 1–19 | ◐ LIKELY ACTIVE |
| NHNew Hudson Facades - MN MH | Mendota Heights | MN | 20–99 | ◐ LIKELY ACTIVE |
| NHNew Hudson Facades - MN R | Rochester | MN | 1–19 | ◐ LIKELY ACTIVE |
| NHNew Hudson Facades - NY | New York | NY | 1–19 | ◐ LIKELY ACTIVE |
| NHNew Hudson Facades - PA | Linwood | PA | 100–499 | ◐ LIKELY ACTIVE |
| NMNew Millennium Building Systems, LLC. - Columbia | Columbia | SC | 20–99 | ◐ LIKELY ACTIVE |
| NMNew Millennium Building Systems, LLC. - Fallon | Fallon | NV | 100–499 | ◐ LIKELY ACTIVE |
| NMNew Millennium Building Systems, LLC. - Northwest Arkansas Engineering | Rogers | AR | 20–99 | ◐ LIKELY ACTIVE |
| NGNext Generation Construction, LLC | Stratford | CT | — | ◐ LIKELY ACTIVE |
| NNiles | Niles | OH | 20–99 | ◐ LIKELY ACTIVE |
| NBNiles Building Products Company - Florida | Jacksonville | FL | 20–99 | ◐ LIKELY ACTIVE |
| NBNiles Building Products Company - Ohio | Niles | OH | 1–19 | ◐ LIKELY ACTIVE |
| NBNiles Building Products Company - Texas | Grand Prairie | TX | 1–19 | ◐ LIKELY ACTIVE |
| NSNimsgern Steel Corp. | Minocqua | WI | 20–99 | ◐ LIKELY ACTIVE |
| NCNitro Cutting Services, LLC | Manheim | PA | 1–19 | ◐ LIKELY ACTIVE |
| NINix Industrial - Fairfield, OH | Farifield | OH | 1–19 | ◐ LIKELY ACTIVE |
| NINix Industrial - Frontage Road | Poseyville | IN | 20–99 | ◐ LIKELY ACTIVE |
| NINix Industrial - Main Street | Poseyville | IN | 20–99 | ◐ LIKELY ACTIVE |
| NINix Industrial - Rockport, IN | Rockport | IN | 20–99 | ◐ LIKELY ACTIVE |
| NMNnm Manufacturing LLC | Plainfield | IL | — | ◐ LIKELY ACTIVE |
| NDNomad Defense LLC | Yukon | OK | — | ▲ REPORTED CLOSED |
| NGNorfork General Industries, Inc | Norfork | AR | 20–99 | ◐ LIKELY ACTIVE |
| NSNorlen - Schofield | Schofield | WI | 100–499 | ◐ LIKELY ACTIVE |
| NCNorris Cylinder Company - Huntsville | Huntsville | AL | 100–499 | ◐ LIKELY ACTIVE |
| NANorth American Manufacturing Corp. | Maspeth | NY | 1–19 | ◐ LIKELY ACTIVE |
| NHNorthern Horizons Solway, Inc | Solway | MN | 100–499 | ◐ LIKELY ACTIVE |
| NSNorthern Steel Services, L.L.C. | Montrose | MI | 20–99 | ◐ LIKELY ACTIVE |
| NTNorth Texas Pressure Vessels, Inc. | Mineral Wells | TX | 20–99 | ◐ LIKELY ACTIVE |
| NMNorthwoods Mfg Inc | Kingsford | MI | 20–99 | ◐ LIKELY ACTIVE |
| NWNuark Warehouse & Logistics | Blytheville | AR | 20–99 | ◐ LIKELY ACTIVE |
| NHNucor Harris Rebar Mid-Atlantic LLC (Baltimore Facility) | Baltimore | MD | 20–99 | ◐ LIKELY ACTIVE |
| NHNucor Harris Rebar Northeast LLC (Bethlehem Facility) | Bethlehem | PA | 20–99 | ◐ LIKELY ACTIVE |
| NHNucor Harris Rebar Northeast LLC (Canaan Facility) | Canaan | NH | 20–99 | ◐ LIKELY ACTIVE |
| NHNucor Harris Rebar Northeast LLC (Pawtucket Facility) | Pawtucket | RI | 20–99 | ◐ LIKELY ACTIVE |
| NHNucor Harris Rebar Northeast LLC (South Deerfield Facility) | South Deerfield | MA | 20–99 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Midwest LLC Bourbonnais, Illinois | Bourbonnais | IL | 20–99 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Midwest LLC Lansing, Michigan | Lansing | MI | 20–99 | ◐ LIKELY ACTIVE |