| MIMoog, Inc. - East Aurora | East Aurora | NY | 500+ | ◐ LIKELY ACTIVE |
| MMMoore Metal Works, LLC | Evansville | IN | 20–99 | ◐ LIKELY ACTIVE |
| MSMorgan Steel Texas, LLC | Greenville | TX | 20–99 | ◐ LIKELY ACTIVE |
| MWMorningstar Welding, LLC | Poolesville | MD | — | ◐ LIKELY ACTIVE |
| MDMorrisville Distributionwarehouse | Morrisville | NC | 20–99 | ◐ LIKELY ACTIVE |
| MAMotion and Flow Control Products, INC. | Colorado Springs | CO | — | ◐ LIKELY ACTIVE |
Motion Systems Elyria HVS | Elyria | OH | 100–499 | ◐ LIKELY ACTIVE |
Motion Systems Forest City | Forest City | NC | 100–499 | ◐ LIKELY ACTIVE |
Motion Systems Hicksville | Hicksville | OH | 100–499 | ◐ LIKELY ACTIVE |
Motion Systems Otsego PDN | Otsego | MI | 20–99 | ◐ LIKELY ACTIVE |
Motion Systems Richland | Richland | MI | 100–499 | ◐ LIKELY ACTIVE |
| MIMultiMetal Inc, dba Moore & Morford II | Greensburg | PA | 20–99 | ◐ LIKELY ACTIVE |
| Mmunster1501 | Hammond | IN | 20–99 | ◐ LIKELY ACTIVE |
| NMNA Mfg Anderson | Anderson | SC | 500+ | ◐ LIKELY ACTIVE |
| NBNational Breaker Services, LLC | Middlebury | CT | 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 |
| 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 |
| NNexGear (DI) | Durham | NC | 500+ | ◐ 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 |
| 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 |
| NGNorfork General Industries, Inc | Norfork | AR | 20–99 | ◐ LIKELY ACTIVE |
| NSNorlen - Schofield | Schofield | WI | 100–499 | ◐ LIKELY ACTIVE |
| NANorth American Manufacturing Corp. | Maspeth | NY | 1–19 | ◐ LIKELY ACTIVE |
| NCNorth Charleston Manufacturing Plant | North Charleston | SC | 100–499 | ◐ 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 |
| 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 |
| NRNucor Rebar Fabrication Midwest LLC Marion, Ohio | Marion | OH | 20–99 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Midwest LLC Mooresville, Indiana | Mooresville | IN | 20–99 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Midwest LLC - Newton Iowa | Newton | IA | 20–99 | ◐ LIKELY ACTIVE |