| 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 |
| OVOhio Valley Stamping-assemblies INC. | Mansfield | OH | — | ◇ UNVERIFIED |
| OSOne Stop Steel | Saint Louis | MO | — | ◇ UNVERIFIED |
| OFONG Flowline Products, LLC | Sulphur | OK | — | ◇ UNVERIFIED |
| OSOps Sales Company | Dewey | OK | — | ◇ UNVERIFIED |
| OPOptions Plus, INC. | Fredericktown | OH | — | ◇ UNVERIFIED |
| PTPacific Tube CO | Los Angeles | CA | — | ◇ UNVERIFIED |
| PSPaley Studios LTD. | Rochester | NY | — | ◇ UNVERIFIED |
| PIParagon Industries INC / Paragon Industries INC | Sapulpa | OK | — | ◇ UNVERIFIED |
| PGParamount Glassworks, LLC | Woodstock | CT | — | ◇ UNVERIFIED |
| PSParking Safe Plus LLC | Chester | NY | — | ◇ UNVERIFIED |
| PSParking Safe Plus LLC | Chester | NY | — | ◇ UNVERIFIED |
| PMPatriot Metal Products INC. | Berwick | PA | — | ◇ UNVERIFIED |
| PLPax, LLC | Gonzales | LA | — | ◇ UNVERIFIED |
| PCP C Campana | Canton | OH | — | ◇ UNVERIFIED |
| PSPciw Steel CORP | San Diego | CA | — | ◇ UNVERIFIED |
| PSP&C Steel Services LLC | Sanford | FL | — | ◇ UNVERIFIED |
| PPPdt - Prysmian Group | Bridgewater | NJ | — | ◇ UNVERIFIED |
| PIPenn-mar, INC. | Sarasota | FL | — | ◇ UNVERIFIED |
| PCPerformance Contractors Rosharon Facility | Rosharon | TX | — | ◇ UNVERIFIED |
| PEPetrosmith Equipment Abilene Facility | Abilene | TX | — | ◇ UNVERIFIED |
| PMPhillips Mfg.& Tower CO Dba Shelby Welded Tube | Shelby | OH | — | ◇ UNVERIFIED |
| PTPhillips Tube Group | Shelby | OH | — | ◇ UNVERIFIED |
| PIPillamere Industries Corporation | Alpharetta | GA | — | ◇ UNVERIFIED |
| PPPittsburgh Pipe & Supply Corporation | Saint Louis | MO | — | ◇ UNVERIFIED |
| PSPlymouth Specialty Manufacturing, LLC | Versailles | KY | — | ◇ UNVERIFIED |
| PTPlymouth Tube CO | Streator | IL | — | ◇ UNVERIFIED |
| PPPoorhouse Properties, LLC | Tangent | OR | — | ◇ UNVERIFIED |
| PWPrecision Welding LLC | Wellington | CO | — | ◇ UNVERIFIED |
| PSPrecison Steel Services, INC. | Farrell | PA | — | ◇ UNVERIFIED |
| PTProduction Technologies INC | Preston | ID | — | ◇ UNVERIFIED |
| PCPrysmian Cables and Systems USA. LLC | Bridgewater Twp | NJ | — | ◇ UNVERIFIED |
| PHPtc Holdings Group | Alliance | OH | — | ◇ UNVERIFIED |
| PSPtc Seamless Tube CORP | Hopkinsville | KY | — | ◇ UNVERIFIED |
| QMQDC Manufacturing | Brighton | MI | — | ◇ UNVERIFIED |
| QTQuadrant Tool and Manufacturing Company | Schaumburg | IL | — | ◇ UNVERIFIED |
| QRQuail Ridge Construction Company | Red House | WV | — | ◇ UNVERIFIED |
| QEQuality Engineered Steels LLC | Point Pleasant | WV | — | ◇ UNVERIFIED |
| QIQuality Ironworks | Dallas | TX | — | ◇ UNVERIFIED |
| RCRail Components, Inc. | Muskegon | MI | — | ◇ UNVERIFIED |
| RORamcast Ornamental Supply CO INC | Fresno | CA | — | ◇ UNVERIFIED |
| RIRam Industrial INC. | Dawson | GA | — | ◇ UNVERIFIED |
| RMRAM Machining, Inc. | Washington Courth House | OH | — | ◇ UNVERIFIED |
| RDRays Dies and Tubing | Swanton | VT | — | ◇ UNVERIFIED |
| RSReliance Steel of Vermont, INC | Colchester | VT | — | ◇ UNVERIFIED |
| RIRemedy Intelligent Staffing, LLC | Panama City Beach | FL | — | ◇ UNVERIFIED |
| RSRey's Stainless Steel & More | Pharr | TX | — | ◇ UNVERIFIED |
| RMRilco Manufacturing Co., Inc. | Houston | TX | — | ◇ UNVERIFIED |
| RIRitch, INC. | Vincent | AL | — | ◇ UNVERIFIED |
| RSRiver Steel INC | La Crosse | WI | — | ◇ UNVERIFIED |
| RSRoberts Steel, LLC | McCalla | AL | — | ◇ UNVERIFIED |
