| LMLaurel Machine & Foundry Hawkes Plant | Laurel | MS | — | ◇ UNVERIFIED |
| LMLauzon Machine and Engineering | Bennington | VT | — | ◇ UNVERIFIED |
| LMLawruk Machine & Tool CO INC | Altoona | PA | — | ◇ UNVERIFIED |
| LDL & D Industries | Hurt | VA | — | ◇ UNVERIFIED |
| LMLebanon Machine Shop | Lebanon | KY | — | ◇ UNVERIFIED |
| LFLebaron Foundry INC | Brockton, City of | MA | — | ◇ UNVERIFIED |
| LFLeed Foundry Inc/st Clair | Saint Clair | PA | — | ◇ UNVERIFIED |
| LILfm Industries | Houston | TX | — | ◇ UNVERIFIED |
| LMLiddy's Machine Shop, INC | Jacksonville | FL | — | ◇ UNVERIFIED |
| LILinamar Indiana Plant 1 | Albion | IN | — | ◇ UNVERIFIED |
| LALiquid Asset Disposal INC | Wheeling | WV | — | ◇ UNVERIFIED |
| LILodi Iron Works | Galt | CA | — | ◇ UNVERIFIED |
| LSLone Star Casting & Machine Partners | Kilgore | TX | — | ◇ UNVERIFIED |
| LLtc | Lebanon | PA | — | ◇ UNVERIFIED |
| LTLufthansa Technik Engine Services | Tulsa | OK | — | ◇ UNVERIFIED |
| LFLynchburg Foundry Llc, D/b/a Archer Creek Foundry | Lynchburg | VA | — | ◇ UNVERIFIED |
| LALynns Auto Body/oreland | Oreland | PA | — | ◇ UNVERIFIED |
| MIMahle Inc-muskegon Hts Complex | Muskegon | MI | — | ◇ UNVERIFIED |
| MMMajestic Machine & Engineering, INC. | Jacksonville | FL | — | ◇ UNVERIFIED |
| MFMansfield Foundry Corporation | Mansfield | OH | — | ◇ UNVERIFIED |
| MCMarox CORP | Holyoke | MA | — | ◇ UNVERIFIED |
| MAMatsu Alabama, INC | Huntsville | AL | — | ◇ UNVERIFIED |
| MFMcabery Foundry, LLC | Phenix City | AL | — | ◇ UNVERIFIED |
| MMMcmillan Mechanical & Machine Co., INC. | Shreveport | LA | — | ◇ UNVERIFIED |
| MCMcwane Cast Iron Pipe CO. | Birmingham | AL | — | ◇ UNVERIFIED |
| MMMegawatt Machine Services | Somerset | NJ | — | ◇ UNVERIFIED |
| MMMercury Manufacturing Company | Wyandotte | MI | — | ◇ UNVERIFIED |
| MIMeritor Industrial Products LLC | Chicago | IL | — | ◇ UNVERIFIED |
| MSMerit Specialities-merit Specialities | Saint Louis | MO | — | ◇ UNVERIFIED |
| MBMetallic Bonds LTD | Beloit | WI | — | ◇ UNVERIFIED |
| MIMetalogic Industries LLC | Southbridge | MA | — | ◇ UNVERIFIED |
| MMetalution | Holland | MI | — | ◇ UNVERIFIED |
| MMMetso Minerals Industries INC | Birmingham | AL | — | ◇ UNVERIFIED |
| MOMetso Outotec USA INC | Warrenton | MO | — | ◇ UNVERIFIED |
| MTMgk Technologies INC | Homer City | PA | — | ◇ UNVERIFIED |
| MGMic Group | Brenham | TX | — | ◇ UNVERIFIED |
| MSMichigan Steel, INC. | Muskegon | MI | — | ◇ UNVERIFIED |
| MMMiddletown Metal Works, INC. | Berea | KY | — | ◇ UNVERIFIED |
| MMMidstate Manufacturing | Galesburg | IL | — | ◇ UNVERIFIED |
| MAMidwest Alloys Foundry | O Fallon | MO | — | ◇ UNVERIFIED |
| MFMidwest Fabrication and Steel LLC | Pueblo | CO | — | ◇ UNVERIFIED |
| MMMidwest Metallurgical Laboratory Site | Marshall | MI | — | ◇ UNVERIFIED |
 Miller Welding & Machine CO | Brookville | PA | — | ◇ UNVERIFIED |
| MFMission Foundry INC | Omaha | NE | — | ◇ UNVERIFIED |
| MSMissouri Steel Castings Incorporated | Joplin | MO | — | ◇ UNVERIFIED |
| MPModern Pattern & Foundry CO. INC. (mp) | Vernon | CA | — | ◇ UNVERIFIED |
| MMMoment Metal LLC | Albany | NY | — | ◇ UNVERIFIED |
| MFMountaineer Fabricators INC | Nitro | WV | — | ◇ UNVERIFIED |
| MIMp Industries, INC. | O Fallon | MO | — | ◇ UNVERIFIED |
| MMMull Machine CO | Wheeling | WV | — | ◇ UNVERIFIED |
| MPMulti-spec Painting INC | Gardena | CA | — | ◇ UNVERIFIED |
| MCMunicipal Castings INC | Madison | MN | — | ◇ UNVERIFIED |
| MGMurray Grinding-dearborn Hgts | Dearborn Heights | MI | — | ◇ UNVERIFIED |
| NANapa Auto Parts Machine Shop | Plymouth | IN | — | ◇ UNVERIFIED |
| NMNash Manufacturing & Grinding Services | Springfield | MA | — | ◇ UNVERIFIED |
| NMNational Metal Abrasive Company | Wadsworth | OH | — | ◇ UNVERIFIED |
| NFNatl Fabricators & Mach/north East Plt | North East | PA | — | ◇ UNVERIFIED |
| NFNeenah Foundry CO - Plants 2 and 3 (w2179) | Neenah | WI | — | ◇ UNVERIFIED |
| NINeo Industries (weirton) INC. | Weirton | WV | — | ◇ UNVERIFIED |
| NCNew Castle Foundry/new Castle | New Castle | PA | — | ◇ UNVERIFIED |
| NENew England Expert Technologies Ne Xt | Greenfield | MA | — | ◇ UNVERIFIED |
| NHNew Haven Foundry | New Haven | MI | — | ◇ UNVERIFIED |
| NWNfm Welding Engineers INC | Massillon | OH | — | ◇ UNVERIFIED |
| NINorgren INC | Littleton | CO | — | ◇ UNVERIFIED |
| NENorthern Engineering Company LLC | Superior | WI | — | ◇ UNVERIFIED |
| NPNorth Penn Area 6 | Lansdale | PA | — | ◇ UNVERIFIED |
| NCNorthwest Castings | Seattle | WA | — | ◇ UNVERIFIED |
| NMNrg Maintenance Services | Houston | TX | — | ◇ UNVERIFIED |
 Oil City Iron Works INC | Corsicana | TX | — | ◇ UNVERIFIED |
| OSOmaha Steel Castings CO | Omaha | NE | — | ◇ UNVERIFIED |
| OLOpen Loop Energy - Nichols Facility | Safford | AZ | — | ◇ UNVERIFIED |
| OOOrchid Orthopedics Solutions | Santa Ana | CA | — | ◇ UNVERIFIED |
| OSOtten Screw Products Co-otten Screw Products CO | Saint Louis | MO | — | ◇ UNVERIFIED |
| OGOz Gedney Llc/shoemakersville Plt | Shoemakersville | PA | — | ◇ UNVERIFIED |
| PCPacific Car and Foundry CO | Renton | WA | — | ◇ UNVERIFIED |
| PMPadnos Manufacturing INC | Grand Rapids | MI | — | ◇ UNVERIFIED |
| PMPalfinger Marine USA INC | Portsmouth | VA | — | ◇ UNVERIFIED |
| PAPall Aeropower CORP Fort Myers | Fort Myers | FL | — | ◇ UNVERIFIED |
| PMParagon Machine Company, INC. | Saint Petersburg | FL | — | ◇ UNVERIFIED |
| PIParamelt Icd Warehouse | Muskegon | MI | — | ◇ UNVERIFIED |
| PGParker Gear Pump Division | Youngstown | OH | — | ◇ UNVERIFIED |
| PHParker Hannifin CORP Hpd | Marysville | OH | — | ◇ UNVERIFIED |
| PEPayne Engineering & Fabrications | Canton | MA | — | ◇ UNVERIFIED |
| PTPeacock Tool & Engineering | Spring Valley | CA | — | ◇ UNVERIFIED |
| PKPelletizer Knives | Houston | TX | — | ◇ UNVERIFIED |
| PIPemco INC | Pascagoula | MS | — | ◇ UNVERIFIED |
| PTPems Tool & Machine INC | Little Falls | NY | — | ◇ UNVERIFIED |
| PIPenatek Inds INC | Odessa | TX | — | ◇ UNVERIFIED |
| PCPenncast Corp/marietta | Marietta | PA | — | ◇ UNVERIFIED |
| PSPennsylvania Steel Fndy & Machine CO | Hamburg | PA | — | ◇ UNVERIFIED |
| PFPentair Flow Technologies, LLC - Ashland Casting Center | Ashland | OH | — | ◇ UNVERIFIED |
| PDPentz Design Pattern and Foundry INC | Duvall | WA | — | ◇ UNVERIFIED |
| PCPerm Cast LLC | Cynthiana | KY | — | ◇ UNVERIFIED |
| PFPier Foundry | Saint Paul | MN | — | ◇ UNVERIFIED |
| PTPike Tool & Grinding Incorporated | Colorado Springs | CO | — | ◇ UNVERIFIED |
| PFPioneer Foundry CO INC | Jackson | MI | — | ◇ UNVERIFIED |
| PPPipe Properties, LLC and Gateway View, LLC | Chattanooga | TN | — | ◇ UNVERIFIED |
| PTP-k Tool & Manufacturing Company | Santa Teresa | NM | — | ◇ UNVERIFIED |
| PEPlant Engineering and Maintenance - Oxford Machine and Fabrication | Oxford | AL | — | ◇ UNVERIFIED |
| PPPlastic Power Extrusions CORP | Schiller Park | IL | — | ◇ UNVERIFIED |
