| NMNational Material Processing, LLC | Chicago | IL | — | ◇ UNVERIFIED |
| NPNational Processing Company | Chicago | IL | — | ◇ UNVERIFIED |
| NSNational Standard Company | Mishawaka | IN | — | ◇ UNVERIFIED |
| NCNational-standard Company | Corbin | KY | — | ◇ UNVERIFIED |
| NSNational Steel Fabricators | Rice Lake | WI | — | ◇ UNVERIFIED |
| NWNational Wire & Cable CORP | Los Angeles | CA | — | ◇ UNVERIFIED |
| NRNatl Roll Co/vertical Seal CO | Pleasantville | PA | — | ◇ UNVERIFIED |
| NANew Age Design & Tool, Inc. | Lagrange | OH | — | ◇ UNVERIFIED |
| NCNewark Carting INC | Newark | NJ | — | ◇ UNVERIFIED |
| NBNew Boston Coke CORP | New Boston | OH | — | ◇ UNVERIFIED |
| NPNew Process Steel - Nps | Alsip | IL | — | ◇ UNVERIFIED |
| NLNiagara Lasalle Corporation | Chattanooga | TN | — | ◇ UNVERIFIED |
| NLNiagara Lasalle Corporation | Hammond | IN | — | ◇ UNVERIFIED |
| NBNibco - Blytheville Division | Blytheville | AR | — | ◇ UNVERIFIED |
| NBNielsen & Bainbridge, LLC. | Bridgeview | IL | — | ◇ UNVERIFIED |
| NANorth American Stainless | Ghent | KY | — | ◇ UNVERIFIED |
| NANorth American Steel & Wire INC | Butler | PA | — | ◇ UNVERIFIED |
| NCNorth Coast Steel LLC | Willoughby | OH | — | ◇ UNVERIFIED |
| NENorthern Empire, LLC | Walker | MN | — | ◇ UNVERIFIED |
| NSNorth South Machinery INC. | La Mirada | CA | — | ◇ UNVERIFIED |
| NSNorth Star Steel Arizona | Golden Valley | AZ | — | ◇ UNVERIFIED |
| NSNorthwestern Steel & Wire CO | Rock Falls | IL | — | ◇ UNVERIFIED |
| NNNortrak North America | Chicago Heights | IL | — | ◇ UNVERIFIED |
| NNNsci Nippon Steel & Sumikin Cold Heading Wire Indiana | Shelbyville | IN | — | ◇ UNVERIFIED |
| NTNss Technologies, INC. | Tyler | TX | — | ◇ UNVERIFIED |
| NCNucor Castrip Arkansas, LLC | Blytheville | AR | — | ◇ UNVERIFIED |
| NCNucor Cold Finishing | Darlington | SC | — | ◇ UNVERIFIED |
| NCNucor Corporation Steel Mill | Plymouth | UT | — | ◇ UNVERIFIED |
| NDNucor Dc Warehouse | Birmingham | AL | — | ◇ UNVERIFIED |
| NGNucor Gallatin Steel LLC | Ghent | KY | — | ◇ UNVERIFIED |
| NSNucor Steel Birmingham, INC. | Birmingham | AL | — | ◇ UNVERIFIED |
| NSNucor Steel Fl INC | Avon Park | FL | — | ◇ UNVERIFIED |
| NSNucor Steel Longview | Longview | TX | — | ◇ UNVERIFIED |
 Nucor Steel Memphis INC | Memphis | TN | — | ◇ UNVERIFIED |
| NSNucor Steel West Virginia LLC | Apple Grove | WV | — | ◇ UNVERIFIED |
| NTNupro Tech LLC | Lebanon | PA | — | ◇ UNVERIFIED |
| NWNutmeg Wire, INC. | Baltic | CT | — | ◇ UNVERIFIED |
| OWO'brien Wire Products of Texas, INC. | Houston | TX | — | ◇ UNVERIFIED |
| OCOhio Cold Rolling Company LLC | Yorkville | OH | — | ◇ UNVERIFIED |
| OFOil Field Pipe and Supply CO. | Springfield | MO | — | ◇ UNVERIFIED |
| OKO & K American CORP. | Chicago | IL | — | ◇ UNVERIFIED |
| OGOld Guard Industrial Group, LLC | Indianapolis | IN | — | ◇ UNVERIFIED |
| OSOld School Services | Henderson | TX | — | ◇ UNVERIFIED |
| OMOlympic Metal Cutting | Montebello | CA | — | ◇ UNVERIFIED |
| OSOlympic Steel INC | Detroit | MI | — | ◇ UNVERIFIED |
| OMOmco Midwest Roll Forming | Pierceton | IN | — | ◇ UNVERIFIED |
| OPOmni Products, INC. | Lincolnton | NC | — | ◇ UNVERIFIED |
| OMO'neal Manufacturing Services | Ambridge | PA | — | ◇ UNVERIFIED |
| OSOps Sales Company | Birmingham | AL | — | ◇ UNVERIFIED |
| OUOpta USA Inc/affival INC | New Kensington | PA | — | ◇ UNVERIFIED |
