| MIMission Iron Works | Pacoima | CA | — | ◇ UNVERIFIED |
| MVMission Viejo Ornamental Iron,r Honarvar | Rancho Sta Margarita | CA | — | ◇ UNVERIFIED |
| MOMissouri Ornamental Iron Company, INC. | University City | MO | — | ◇ UNVERIFIED |
| MMM & M Contractors | Aberdeen | WA | — | ◇ UNVERIFIED |
 Modern Metal Solutions LLC | Hudson | NH | — | ◇ UNVERIFIED |
| MCMomomi CO LTD Dba Tru-form Metals | Livermore | CA | — | ◇ UNVERIFIED |
| MHMonarch Hardware Manufacturing | Shepherdsville | KY | — | ◇ UNVERIFIED |
| MMMonster Mud Pits INC. | Fort Stockton | TX | — | ◇ UNVERIFIED |
| MMMonster Mud Pits INC. | Mentone | TX | — | ◇ UNVERIFIED |
| MOMorgan's Outdoor Living INC. | Concord | CA | — | ◇ UNVERIFIED |
| MDMoz Designs INC | Livermore | CA | — | ◇ UNVERIFIED |
| MOMq Ornamental | Chula Vista | CA | — | ◇ UNVERIFIED |
| MOMueller Ornamental Iron Works, INC. | Elk Grove Village | IL | — | ◇ UNVERIFIED |
| MMMulti Metals Company, INC. | Greensburg | PA | — | ◇ UNVERIFIED |
| MMMunns Manufacturing INC. | Tremonton | UT | — | ◇ UNVERIFIED |
| MIMurray's Iron Works INC | Commerce | CA | — | ◇ UNVERIFIED |
| MMMusic's Metal Works, LLC. | Dayton | OH | — | ◇ UNVERIFIED |
| MM+v | El Paso | TX | — | ◇ UNVERIFIED |
| MIMwi INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| MFMyers Fabrication INC | Eugene | OR | — | ◇ UNVERIFIED |
| NINext Innovations LTD | Walker | MN | — | ◇ UNVERIFIED |
| NINicks Iron Works, INC | Brooklyn | NY | — | ◇ UNVERIFIED |
| NMNick's Metal Fabricating & Sons, Inc. | Seneca | IL | — | ◇ UNVERIFIED |
| NBNor Bay Ironcraft | Petaluma | CA | — | ◇ UNVERIFIED |
| NCNortheast Construction Industries, INC. | Montgomery | NY | — | ◇ UNVERIFIED |
| NFNortheast Fence & Iron Works, INC. | Philadelphia | PA | — | ◇ UNVERIFIED |
| NCNorthern Containment LLC | Brainerd | MN | — | ◇ UNVERIFIED |
| NSNorth Star Safe LLC | Salt Lake City | UT | — | ◇ UNVERIFIED |
| NINova Industries INC | San Leandro | CA | — | ◇ UNVERIFIED |
| NFNowlin Fence INC | Anaheim | CA | — | ◇ UNVERIFIED |
| NGNucor Grating - Fisher & Ludlow INC. | Madison | MS | — | ◇ UNVERIFIED |
| NRNucor Rebar Fabrication Fontana | Fontana | CA | — | ◇ UNVERIFIED |
| NRNucor Rebar Fabrication Southwest INC | Lakeside | CA | — | ◇ UNVERIFIED |
| NINw Iron Works INC | Portland | OR | — | ◇ UNVERIFIED |
| OMO'Brien Metal Inc. | Chicago | IL | — | ◇ UNVERIFIED |
| OOObrien Ornamental Iron INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| OCOctober CO Chemetal Division | Easthampton | MA | — | ◇ UNVERIFIED |
| OSOklahoma Stair Craft, INC. | Sapulpa | OK | — | ◇ UNVERIFIED |
| OSOld South Ironworks INC | Gray | TN | — | ◇ UNVERIFIED |
| OWOld World Iron | Gilroy | CA | — | ◇ UNVERIFIED |
| OOOliver's Ornamental Iron, LLC | Flora | MS | — | ◇ UNVERIFIED |
| OEOne Ez Post LLC | Kingsport | TN | — | ◇ UNVERIFIED |
| OFOnGuard Fence Systems, Ltd. | Moorestown | NJ | — | ◇ UNVERIFIED |
| ODOrnamental Design Inc | Tampa | FL | — | ◇ UNVERIFIED |
| OIOrnamental Iron Concept,bartolome Fluxa | Van Nuys | CA | — | ◇ UNVERIFIED |
| OIOrnamental Ironworks | Los Angeles | CA | — | ◇ UNVERIFIED |
| ODOscar Diaz Rivera | San Juan | PR | — | ◇ UNVERIFIED |
| OOOsuna Ornamental LLC | Miami | FL | — | ◇ UNVERIFIED |
| PMPacific Metal Works INC | Beaverton | OR | — | ◇ UNVERIFIED |
| PWPacific Waterjet Cutting INC | Chico | CA | — | ◇ UNVERIFIED |
| PSPalmetto Southern INC | Lexington | SC | — | ◇ UNVERIFIED |
| PMPan Metal Corporation | Los Angeles | CA | — | ◇ UNVERIFIED |
| PMParagon Metal Fabrication, LLC | Bozeman | MT | — | ◇ UNVERIFIED |
| PMPatina Metals INC | Houston | TX | — | ◇ UNVERIFIED |
| PPPatti Port | Garden Grove | CA | — | ◇ UNVERIFIED |
| PSPaul Stewart Industries INC. | Semmes | AL | — | ◇ UNVERIFIED |
| PIPawnee Ironworks LLC | Wichita | KS | — | ◇ UNVERIFIED |
| PMPbs Metalworks INC | Sauk Rapids | MN | — | ◇ UNVERIFIED |
| PFP&c Fence Company INC. | Bridgeport | CT | — | ◇ UNVERIFIED |
| PLPdk LLC | Minneapolis | MN | — | ◇ UNVERIFIED |
| PIPeconic Iron Works | Quogue | NY | — | ◇ UNVERIFIED |
| PBPerez Brothers Ornamental Iron Works, Inc. | Van Nuys | CA | — | ◇ UNVERIFIED |
| PAPerfect Air Control LLC / Metal Industries LLC of Nc | Marion | NC | — | ◇ UNVERIFIED |
| PSPerfection Stainless Fabrication, INC. | Bakersfield | CA | — | ◇ UNVERIFIED |
| PSPerformance Structures, INC. | Oakland | CA | — | ◇ UNVERIFIED |
| PSPerformance Structures, INC. | Oakland | CA | — | ◇ UNVERIFIED |
| PNPermasteelisa North America CORP | Modesto | CA | — | ◇ UNVERIFIED |
| PLPerry Luxe, LLC | Tucson | AZ | — | ◇ UNVERIFIED |
| PMPetersen Metals | Hudson | FL | — | ◇ UNVERIFIED |
| PSPeterson Sheet Metal, INC. | San Ramon | CA | — | ◇ UNVERIFIED |
| PAPhoenix Architectural Products, INC. | Smyrna | GA | — | ◇ UNVERIFIED |
| PGPineapple Grove Designs INC. | Boynton Beach | FL | — | ◇ UNVERIFIED |
| PRPine River Partners LLC | Salt Lake City | UT | — | ◇ UNVERIFIED |
| PBPitney Bowes INC | Fullerton | CA | — | ◇ UNVERIFIED |
| PGPiw Group, LLC | Park Ridge | IL | — | ◇ UNVERIFIED |
| PPPlatinum Powdercoating | Chico | CA | — | ◇ UNVERIFIED |
| PTPlaya Tool & Marine INC | Santa Ana | CA | — | ◇ UNVERIFIED |
| PVPmg Ventures, INC | Atlanta | GA | — | ◇ UNVERIFIED |
| PFPonderosa Forge & Iron Works INC | Sisters | OR | — | ◇ UNVERIFIED |
| PSPorter Steel, Inc | Lilburn | GA | — | ◇ UNVERIFIED |
| PSPorter Steel, Inc. | Lilburn | GA | — | ◇ UNVERIFIED |
| PSPortland Sheet Metal Works INC | Tigard | OR | — | ◇ UNVERIFIED |
| PSPortland Sheet Metal Works INC | Portland | OR | — | ◇ UNVERIFIED |
| PSPortland Sheet Metal Works INC | — | OR | — | ◇ UNVERIFIED |
| PSPortland Sheet Metal Works INC | — | OR | — | ◇ UNVERIFIED |
| PPP & P Artec, INC. | Wood Dale | IL | — | ◇ UNVERIFIED |
| PLPractik LLC | Seattle | WA | — | ◇ UNVERIFIED |
| PRPrairie River Properties LLC | Merrill | WI | — | ◇ UNVERIFIED |
| PIPrairieville Iron Works | Prairieville | LA | — | ◇ UNVERIFIED |
| PBPrecision Build Solutions, LLC | Tampa | FL | — | ◇ UNVERIFIED |
| PIPrecision Iron Works | Maywood | CA | — | ◇ UNVERIFIED |
 Precision Ladders LLC | Morristown | TN | — | ◇ UNVERIFIED |
| PAPremier Architectural Sheet Metal LLC | Wilmington | DE | — | ◇ UNVERIFIED |
| PIPremiercraft INC. | Oklahoma City | OK | — | ◇ UNVERIFIED |
| PMPremier Metal Works | Salt Lake City | UT | — | ◇ UNVERIFIED |
| PSPrescott Studio, LLC | Santa Fe | NM | — | ◇ UNVERIFIED |
| PCPresidio Custom Metal Works | Round Rock | TX | — | ◇ UNVERIFIED |
| POPrices Outdoor Cookers | Pensacola | FL | — | ◇ UNVERIFIED |
| PIPRM Industrial Corp. | Bohemia | NY | — | ◇ UNVERIFIED |
| QMQuality Metal Craft, INC. | Quincy | MA | — | ◇ UNVERIFIED |
