| JPJoliet Public Scrap Metal Recycling Yard | Joliet | IL | — | ◇ UNVERIFIED |
| JSJustrite Safety Group - U.s. Chemical Storage | Wilkesboro | NC | — | ◇ UNVERIFIED |
| KSKatelman Steel Fabrication INC | Council Bluffs | IA | — | ◇ UNVERIFIED |
| KIKennametal Isa | New Castle | PA | — | ◇ UNVERIFIED |
| KPKenwal Pickling, LLC | Dearborn | MI | — | ◇ UNVERIFIED |
| KBKeystone Bar Products INC | Chicago Heights | IL | — | ◇ UNVERIFIED |
| KLKeystone Lime Co/galley Quarry | Springs | PA | — | ◇ UNVERIFIED |
| KSKing Steel Corporation | Norfolk | NE | — | ◇ UNVERIFIED |
| KWKokoku Wire Industries Corporation | South Bend | IN | — | ◇ UNVERIFIED |
| KSK & S Steel Fabrication, INC | Manchester | TN | — | ◇ UNVERIFIED |
| KIKullman Industries | Lebanon | NJ | — | ◇ UNVERIFIED |
| KSKurland Steel CO | Urbana | IL | — | ◇ UNVERIFIED |
| LQLa Quinta Plant | Portland | TX | — | ◇ UNVERIFIED |
| LSLexington Steel CORP | Bedford Park | IL | — | ◇ UNVERIFIED |
| MSM5 Steel Mfg | Los Angeles | CA | — | ◇ UNVERIFIED |
 Magnetic Metals Corporation | Camden | NJ | — | ◇ UNVERIFIED |
| MSMclouth Steel Gibraltar Plant | Gibraltar | MI | — | ◇ UNVERIFIED |
| MWMcshane Welding CO INC | Erie | PA | — | ◇ UNVERIFIED |
| MMMesco Metal Buildings | Southlake | TX | — | ◇ UNVERIFIED |
| MBMetal Building Products, Inc., Dba Spirco Manufacturing | Memphis | TN | — | ◇ UNVERIFIED |
 Metal Culverts INC M & M Highway Materials Div | Columbia | MO | — | ◇ UNVERIFIED |
| MAMetl-span a Div of Nci Group INC | Shelbyville | IN | — | ◇ UNVERIFIED |
| MMMfi Merchandising | Winterset | IA | — | ◇ UNVERIFIED |
| MCMichels & CO Furniture Mfg | Lynwood | CA | — | ◇ UNVERIFIED |
| MCMid-continent Coal & Coke | Portage | IN | — | ◇ UNVERIFIED |
| MMMidwest Mfg Prehung Plant | Eau Claire | WI | — | ◇ UNVERIFIED |
| MRMiltec Resources Uss Edgar Thomson Works | Braddock | PA | — | ◇ UNVERIFIED |
| MMMk Metalfoils USA INC | Duncan | SC | — | ◇ UNVERIFIED |
| MIModlogiq INC Modular Building Specialists | New Holland | PA | — | ◇ UNVERIFIED |
| MIMubea INC | Florence | KY | — | ◇ UNVERIFIED |
| NRNatl Roll Co/vertical Seal CO | Pleasantville | PA | — | ◇ UNVERIFIED |
| NBNci Building Systems | Tallapoosa | GA | — | ◇ UNVERIFIED |
| NBNci Building Systems | Atwater | CA | — | ◇ UNVERIFIED |
| NBNci Building Systems L.p. | Lexington | TN | — | ◇ UNVERIFIED |
| NCNewark Carting INC | Newark | NJ | — | ◇ UNVERIFIED |
| NBNew Boston Coke CORP | New Boston | OH | — | ◇ UNVERIFIED |
| NLNiagara Lasalle Corporation | Chattanooga | TN | — | ◇ UNVERIFIED |
| NBNielsen & Bainbridge, LLC. | Bridgeview | IL | — | ◇ UNVERIFIED |
| NNNortrak North America | Chicago Heights | IL | — | ◇ UNVERIFIED |
| NBNucor Bright Bar Orrville | Orrville | OH | — | ◇ UNVERIFIED |
| NCNucor Cold Finishing | Darlington | SC | — | ◇ UNVERIFIED |
| NCNucor Cold Finish Wisconsin INC | Oak Creek | WI | — | ◇ UNVERIFIED |
| NINucor Insulated Panel Group | North Las Vegas | NV | — | ◇ UNVERIFIED |
| NSNucor Steel Birmingham, INC. | Birmingham | AL | — | ◇ UNVERIFIED |
| OCOhio Cold Rolling Company LLC | Yorkville | OH | — | ◇ UNVERIFIED |
| OSOlympic Steel | Schaumburg | IL | — | ◇ UNVERIFIED |
| OSOps Sales Company | Birmingham | AL | — | ◇ UNVERIFIED |
| OSOutokumpu Stainless Bar INC | Richburg | SC | — | ◇ UNVERIFIED |
| PBPacific Building Systems | Woodburn | OR | — | ◇ UNVERIFIED |
| PIPackage Industries INC | Sutton | MA | — | ◇ UNVERIFIED |
