| LPLined Pipe Systems LLC | Rancho Cucamonga | CA | — | ◇ UNVERIFIED |
| LILmc Industrial Contracting, INC. | Rochester | NY | — | ◇ UNVERIFIED |
| LJLock Joint Tube - Ireland Rd | South Bend | IN | — | ◇ UNVERIFIED |
| LJLock Joint Tube - Tennessee | Chattanooga | TN | — | ◇ UNVERIFIED |
| LMLoc Mfg INC | San Jose | CA | — | ◇ UNVERIFIED |
| LSLone Star Plant Lone Star Power Station | Lone Star | TX | — | ◇ UNVERIFIED |
| LSLtv Steel Company Counce Plant | Counce | TN | — | ◇ UNVERIFIED |
 Luxfer Magtech Inc/tamaqua | Tamaqua | PA | — | ◇ UNVERIFIED |
| MAMad Acres LLC | Morrison | CO | — | ◇ UNVERIFIED |
| MFMaeco Fabrication INC | Grand Bay | AL | — | ◇ UNVERIFIED |
| MFMaeco Fabrication, INC. | Biloxi | MS | — | ◇ UNVERIFIED |
| MMMantua Manufacturing Company | Stoughton | MA | — | ◇ UNVERIFIED |
| MCManufactured Component Parts, LTD | Houston | TX | — | ◇ UNVERIFIED |
| MVMarco Velasquez-medina | San Marcos | CA | — | ◇ UNVERIFIED |
| MJMario Juarez-perez | El Cajon | CA | — | ◇ UNVERIFIED |
| MAMaruichi American CORP | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| MMMaryland Metals Processing, INC. | Sparrows Point | MD | — | ◇ UNVERIFIED |
| MCMaverick C-p INC Dba Republic Conduit | Pleasure Ridge Park | KY | — | ◇ UNVERIFIED |
| MTMaverick Tube Corporation | Ferndale | MI | — | ◇ UNVERIFIED |
| MGMccoy Global USA | Broussard | LA | — | ◇ UNVERIFIED |
| MHMCM Holdings LLC | Minnesota City | MN | — | ◇ UNVERIFIED |
| MTMercury Tube - 3211 W Bear Creek Dr | Englewood | CO | — | ◇ UNVERIFIED |
| MTMetalcraft Tool & Die INC. | Ixonia | WI | — | ◇ UNVERIFIED |
 Metal Culverts INC Florida Div | Clearwater | FL | — | ◇ UNVERIFIED |
| MIMetal-matic INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| MPMetal Partners Rebar, LLC | Chicago | IL | — | ◇ UNVERIFIED |
| MTMetal Tech Products, INC | Detroit | MI | — | ◇ UNVERIFIED |
| MMMichael Miraula | North Hollywood | CA | — | ◇ UNVERIFIED |
| MIMicrogroup INC | Medway | MA | — | ◇ UNVERIFIED |
| MCMid-south Control Line | Houston | TX | — | ◇ UNVERIFIED |
| MEMirin Enterprises LLC | Seagoville | TX | — | ◇ UNVERIFIED |
| MCMiw Corporation | Fall River | MA | — | ◇ UNVERIFIED |
| MSMlp Steel, LLC | Everson | PA | — | ◇ UNVERIFIED |
| MIM&m International | South Plainfield | NJ | — | ◇ UNVERIFIED |
| MMM & M Sheet Metal & Steel Fabricators | Williamsport | PA | — | ◇ UNVERIFIED |
| MIMola Iron Works | Jersey City | NJ | — | ◇ UNVERIFIED |
| NRNapa Redevelopment Partners, LLC | Napa | CA | — | ◇ UNVERIFIED |
| NMNational Metalwares L.p. | Aurora | IL | — | ◇ UNVERIFIED |
| NPNational Processing Company | Chicago | IL | — | ◇ UNVERIFIED |
| NANorth American Container Corporation | Newnan | GA | — | ◇ UNVERIFIED |
| NINorthrock Industries, Inc. | Bohemia | NY | — | ◇ UNVERIFIED |
| NPNorthwest Pipe Company, LLC | Tracy | CA | — | ◇ UNVERIFIED |
| NPNorthwest Pipe-houston | Houston | TX | — | ◇ UNVERIFIED |
| NSNorthwest Short Line, LLC | Hamilton | MT | — | ◇ UNVERIFIED |
| NTNov Tubescope | Odessa | TX | — | ◇ UNVERIFIED |
| NTNucor Tubular Products | Madison | IN | — | ◇ UNVERIFIED |
| NTNucor Tubular Products | Bedford Park | IL | — | ◇ UNVERIFIED |
| NTNucor Tubular Products - Gallatin | Ghent | KY | — | ◇ UNVERIFIED |
| OIOakley Industries INC | Niles | IL | — | ◇ UNVERIFIED |
| OUOdermath USA INC | Naperville | IL | — | ◇ UNVERIFIED |
