| NFNationwide Fabrication | Northglenn | CO | 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 |
| NNej | Paterson | NJ | 20–99 | ◐ LIKELY ACTIVE |
| NMNelson Miller Group - Berlin WI | Berlin | WI | 20–99 | ◐ LIKELY ACTIVE |
| NNewark | Newark | CA | 1–19 | ◐ LIKELY ACTIVE |
| NENew England Fabricated Metals, Inc. | Leominster | MA | 20–99 | ◐ LIKELY ACTIVE |
| NENew England Small Tube Corporation | Litchfield | NH | 20–99 | ◐ LIKELY ACTIVE |
| NINewjac Industrial, LLC | Indianapolis | IN | — | ◐ 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 |
| NTNew Trend Manufacturing LLC | Harper | KS | — | ▲ REPORTED CLOSED |
| NDNexgen Design Systems | Pittsburgh | PA | 20–99 | ◐ LIKELY ACTIVE |
| NGNIC Global-Corporate Headquarters | Woodinville | WA | 100–499 | ◐ LIKELY ACTIVE |
| NGNIC Global-OH | Chillicothe | OH | 20–99 | ◐ LIKELY ACTIVE |
| NGNIC Global - Spokane | Spokane | WA | 20–99 | ◐ LIKELY ACTIVE |
| NGNIC Global-TN | Gallatin | TN | 100–499 | ◐ LIKELY ACTIVE |
| NGNIC Global-TX | Denton | TX | 20–99 | ◐ LIKELY ACTIVE |
| NSNIC - Steam Plant | Gallatin | TN | 20–99 | ◐ 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 |
| NTNilkanth Two INC | Adamsburg | PA | — | ◐ LIKELY ACTIVE |
| NSNimsgern Steel Corp. | Minocqua | WI | 20–99 | ◐ LIKELY ACTIVE |
| NLNitren LLC | Lakeland | FL | — | ◐ 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 |
| NINmc INC. | Nashville | TN | — | ◐ LIKELY ACTIVE |
| NINoblitt International Corporation | Columbus | IN | — | ◐ LIKELY ACTIVE |
| NGNorfork General Industries, Inc | Norfork | AR | 20–99 | ◐ LIKELY ACTIVE |
| NANorgren Automation Solutions Rochester Hills | Rochester Hills | MI | 20–99 | ◐ LIKELY ACTIVE |
| NSNorlen - Schofield | Schofield | WI | 100–499 | ◐ LIKELY ACTIVE |
| NANorth America JELDWEN Engineering | Klamath Falls | OR | 20–99 | ◐ LIKELY ACTIVE |
| NANorth American Manufacturing Corp. | Maspeth | NY | 1–19 | ◐ LIKELY ACTIVE |
| NANorth American Metallurgic Solutions | Central City | KY | 20–99 | ◐ LIKELY ACTIVE |
| NMNorther Metal Fab | Baldwin | WI | 20–99 | ◐ LIKELY ACTIVE |
| NHNorthern Horizons Solway, Inc | Solway | MN | 100–499 | ◐ LIKELY ACTIVE |
| NINorthern Industrial Repair LLC | Landenberg | PA | — | ◐ LIKELY ACTIVE |
| NSNorthern Steel Services, L.L.C. | Montrose | MI | 20–99 | ◐ LIKELY ACTIVE |
| NSNorth Star Metals Mfg Co | Uhrichsville | OH | 20–99 | ◐ LIKELY ACTIVE |
| NTNorth Texas Pressure Vessels, Inc. | Mineral Wells | TX | 20–99 | ◐ LIKELY ACTIVE |
| NANorthwest Arkansas Sheet Metal, Inc. | Rogers | AR | 20–99 | ◐ LIKELY ACTIVE |
| NMNorton McMurray Manufacturing | Geneva | IL | 20–99 | ◐ LIKELY ACTIVE |
| NSNo Sweat Service Group INC | Pottsville | PA | — | ◐ LIKELY ACTIVE |
| NSNovak Supply LLC | Cleveland | OH | — | ◐ LIKELY ACTIVE |
| NDNRS DBA Lakeland Center Plant 2 | Lakeland | FL | 20–99 | ◐ LIKELY ACTIVE |
| NDNRS DBS Lakeland Center Plant 1 | Lakeland | FL | 20–99 | ◐ LIKELY ACTIVE |
| NWNuark Warehouse & Logistics | Blytheville | AR | 20–99 | ◐ LIKELY ACTIVE |
| NDNucor Data Systems | Madison | IN | 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 |
| NRNucor Rebar Fabrication Midwest LLC - Roberts Wisonsin | Roberts | WI | 20–99 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Midwest LLC Rockford, Illinois | Rockford | IL | 20–99 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Midwest LLC - Sedalia Missouri | Sedalia | MO | 20–99 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Midwest LLC - St. Louis Missouri | Saint Louis | MO | 1–19 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Services Center Corp | Fort Wayne | IN | 20–99 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Southcentral LLC - Dallas Texas | Dallas | TX | 20–99 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Southcentral LLC - Houston Texas | Dayton | TX | 20–99 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Southcentral LLC - Jackson Mississippi | Flowood | MS | 20–99 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Southcentral LLC - Jewett Texas | Jewett | TX | 20–99 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Southcentral LLC - Slidell Louisiana | Slidell | LA | 20–99 | ◐ LIKELY ACTIVE |
| NSNucor Skyline | Huger | SC | 20–99 | ◐ LIKELY ACTIVE |
| NTNucor Towers and Structures Indiana | New Ross | IN | 100–499 | ◐ LIKELY ACTIVE |
| NTNucor Towers & Structures Inc | West Hazleton | PA | 100–499 | ◐ LIKELY ACTIVE |
| NDNucor (Vulcraft Division) | Saint Joe | IN | 100–499 | ◐ LIKELY ACTIVE |
| NENuena Enterprises, LLC | Houston | TX | — | ◐ LIKELY ACTIVE |
| NINuno Iron & Mfg. Inc. | King City | CA | 20–99 | ◐ LIKELY ACTIVE |
| NRNu Ray Metal Products INC | Puyallup | WA | 20–99 | ◐ LIKELY ACTIVE |
| NSNutech Steel INC | Ogden | UT | — | ◐ LIKELY ACTIVE |
| NLNuverde, LLC | Austin | TX | — | ◐ LIKELY ACTIVE |
| NFNuway Fab | Troy | IL | 1–19 | ◐ LIKELY ACTIVE |
| NINu-Way Industries, Inc. | Elk Grove Village | IL | 100–499 | ◐ LIKELY ACTIVE |
| NINystrom INC | Brooklyn Park | MN | — | ◐ LIKELY ACTIVE |
| OROak Ridge Industries, LLC | Washington | NC | 20–99 | ◐ LIKELY ACTIVE |
| OMO'Brien Metal Works | Clover | SC | 1–19 | ◐ LIKELY ACTIVE |
| OIOcci, INC. | Fulton | MO | — | ◐ LIKELY ACTIVE |
| OIOCTA Inc | Buckner | KY | 20–99 | ◐ LIKELY ACTIVE |
OEM Fabricators Inc. - Neillsville | Neillsville | WI | 20–99 | ◐ LIKELY ACTIVE |
OEM Fabricators Inc. - Phillips | Phillips | WI | 20–99 | ◐ LIKELY ACTIVE |
| OTOEM Tube Assemblies - Chipley | Chipley | FL | 20–99 | ◐ LIKELY ACTIVE |
| OTOEM Tube Assemblies - Clarksville | Clarksville | TN | 100–499 | ◐ LIKELY ACTIVE |
| OBOhio Bridge Manufacturing | Cambridge | OH | 20–99 | ◐ LIKELY ACTIVE |
| OFOhio Fabricators Company, Inc. | Coshocton | OH | 20–99 | ◐ LIKELY ACTIVE |
| OMOhio Moulding | Wickliffe | OH | 20–99 | ◐ LIKELY ACTIVE |
| OSOhio Steel Industries Inc - Structural Division | Pataskala | OH | 20–99 | ◐ LIKELY ACTIVE |
| OCOJV Construction | Elk Grove | CA | 100–499 | ◐ LIKELY ACTIVE |