| 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 |
| 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 |
| 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 |
| NLNuverde, LLC | Austin | TX | — | ◐ LIKELY ACTIVE |
| NFNuway Fab | Troy | IL | 1–19 | ◐ LIKELY ACTIVE |
| OMO'Brien Metal Works | Clover | SC | 1–19 | ◐ LIKELY ACTIVE |
| OIOcci, INC. | Fulton | MO | — | ◐ LIKELY ACTIVE |
| OBOhio Bridge Manufacturing | Cambridge | 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 |
| OSOmega Steel, Inc. | Bloomingdale | GA | 20–99 | ◐ LIKELY ACTIVE |
| OWOptimized Welding Services LLC | El Paso | TX | — | ◐ LIKELY ACTIVE |
| OTOregon Trail Fabrication LLC | Salem | OR | — | ◐ LIKELY ACTIVE |
| OWOscar's Welding Svcs LLC | Odessa | TX | — | ◐ LIKELY ACTIVE |
| OOttawa | Ottawa | KS | 20–99 | ◐ LIKELY ACTIVE |
| OOwensboro | Owensboro | KY | 20–99 | ◐ LIKELY ACTIVE |
| OSOzark Steel, LLC | Farmington | MO | 20–99 | ◐ LIKELY ACTIVE |
| PAPa35 Ametek Smp Eighty Four | Eighty Four | PA | 20–99 | ◐ LIKELY ACTIVE |
| PSPacific Stair Corporation - CA | Los Angeles | CA | 1–19 | ◐ LIKELY ACTIVE |
| PWParker Welding & Fabrication LLC | Greenleaf | KS | — | ◐ LIKELY ACTIVE |
| PIPatrick Industries, Inc. d/b/a/ Engineered Metals & Composites Inc | West Columbia | SC | 100–499 | ◐ LIKELY ACTIVE |
| PPhoenix | Phoenix | AZ | 1–19 | ◐ LIKELY ACTIVE |
| POPier of D'nort | St Germain | WI | 20–99 | ◐ LIKELY ACTIVE |
| PIPinnacle Industries, LLC DBA Pinnacle Steel, Inc. | Henderson | CO | 20–99 | ◐ LIKELY ACTIVE |
| PSPk5 Solutions LLC | Tucson | AZ | — | ◐ LIKELY ACTIVE |
| PPlank | Peoria | IL | 20–99 | ◐ LIKELY ACTIVE |
| P1Plant 1 | Meridian | MS | 100–499 | ◐ LIKELY ACTIVE |
| P2Plant 2 | Birmingham | AL | 20–99 | ◐ LIKELY ACTIVE |
| P2Plant 2 | Meridian | MS | 20–99 | ◐ LIKELY ACTIVE |
| PCPlum Creek Enviromental Technologies | Seabrook | NH | 20–99 | ◐ LIKELY ACTIVE |
| PCPlum Creek Environmental Technologies | West Point MS | MS | 100–499 | ◐ LIKELY ACTIVE |
| PIPlymouth IN - Valmont Telecommunications, Inc. | Plymouth | IN | 20–99 | ◐ LIKELY ACTIVE |
| PMP & M Steel | Sioux Falls | SD | 20–99 | ◐ LIKELY ACTIVE |
| PHPnk Holdings LLC | Winder | GA | 20–99 | ◐ LIKELY ACTIVE |
| PAPowe and Associates INC | Waterford | MI | — | ◐ LIKELY ACTIVE |
| PFPrecision Flange & Machine INC | Houston | TX | 100–499 | ◐ LIKELY ACTIVE |
| PIPrecision Industrial Manufacturing | Woodland | WA | 20–99 | ◐ LIKELY ACTIVE |
| PMPrecision Metal-tech, LLC | Springfield | MO | — | ◐ LIKELY ACTIVE |
| PWPrecision Welding & Fabrication, LLC | Deville | LA | — | ◐ LIKELY ACTIVE |
| PMPreferred Machine LLC: Holland | Holland | MI | 20–99 | ◐ LIKELY ACTIVE |
| PMPreferred Machine LLC: Jenison | Jenison | MI | 1–19 | ◐ LIKELY ACTIVE |
| PFPremier Fabrication | Congerville | IL | 1–19 | ◐ LIKELY ACTIVE |
| PSPremier Steel Services, LLC | Glenpool | OK | 20–99 | ◐ LIKELY ACTIVE |
| PAProduction area | Wyoming | MN | 1–19 | ◐ LIKELY ACTIVE |
| PCProduction Cutting Services, Inc. - East Moline | East Moline | IL | 1–19 | ◐ LIKELY ACTIVE |
| PCProduction Cutting Services, Inc. - Waterman | Waterman | IL | 1–19 | ◐ LIKELY ACTIVE |
| PFPro Fab Custom Fabrication and Welding Inc. | Georgetown | TX | 20–99 | ◐ LIKELY ACTIVE |
| PEProinlosa Energy Corporation | Houston | TX | — | ◐ LIKELY ACTIVE |
| PIPSP Industries | Iuka | MS | 20–99 | ◐ LIKELY ACTIVE |
| QLQcmf LLC | Winona | MN | — | ◐ LIKELY ACTIVE |
| QLQ-ram, LLC | Cleveland | OH | — | ◐ LIKELY ACTIVE |
| QEQsi Environmental & Industrial Fab | Dothan | AL | 20–99 | ◐ LIKELY ACTIVE |
| QSQuality Steel Fabricating and Welding, INC. | Salt Lake City | UT | — | ◐ LIKELY ACTIVE |
| QSQuality Steel Fabricators, Inc. | Poway | CA | 1–19 | ◐ LIKELY ACTIVE |
| QBQuinn Bros. of Essex, INC. | Essex | MA | — | ◐ LIKELY ACTIVE |
| RIRademacher Industrial | Farrell | PA | 20–99 | ◐ LIKELY ACTIVE |
| RRailway | San Antonio | TX | 20–99 | ◐ LIKELY ACTIVE |
| RDRapid Deployable Systems, INC. | Hanahan | SC | — | ◐ LIKELY ACTIVE |
| RSRays Stairs Inc- SHOP | Atlanta | GA | 20–99 | ◐ LIKELY ACTIVE |
| RMRBS Manufacturing | East Palestine | OH | 20–99 | ◐ LIKELY ACTIVE |
| RIRebarfab, Inc. | New Brighton | MN | 20–99 | ◐ LIKELY ACTIVE |
| RSRebar Supply Co. Ltd. | Houston | TX | 20–99 | ◐ LIKELY ACTIVE |
| RRedding | Redding | CA | 20–99 | ◐ LIKELY ACTIVE |
| RIRedd Iron INC | Brighton | CO | 20–99 | ◐ LIKELY ACTIVE |
| RLRedfeather, LLC | Muskogee | OK | — | ◐ LIKELY ACTIVE |
| RSRedwhiteblue Solutions LLC | Nolensville | TN | — | ◐ LIKELY ACTIVE |
| RCRelax Custom LLC | Boise | ID | — | ◐ LIKELY ACTIVE |
| RWRens Welding & Fabricating Inc. | Taunton | MA | 20–99 | ◐ LIKELY ACTIVE |
| RSReSteel Supply Co., Eddystone | Eddystone | PA | 100–499 | ◐ LIKELY ACTIVE |