| DHDriscol Holdings, LLC | Chino Valley | AZ | — | ◇ UNVERIFIED |
| DMD&s Mag and Peen INC Dba Tri-process Company | Paramount | CA | — | ◇ UNVERIFIED |
| DCDuffy CO | Palatine | IL | — | ◇ UNVERIFIED |
| EMEastern Metal Treating | Enfield | CT | — | ◇ UNVERIFIED |
| EHEast-lind Heat Treat, INC | Madison Heights | MI | — | ◇ UNVERIFIED |
| EIEastwind Investments LLC | Troutdale | OR | — | ◇ UNVERIFIED |
| EMEklund Metal Treating INC | Loves Park | IL | — | ◇ UNVERIFIED |
| ECElk Cnty Heat Treaters/st Marys | Saint Marys | PA | — | ◇ UNVERIFIED |
| EIEllipsis, INC. | Kent | OH | — | ◇ UNVERIFIED |
| EMExcel Metal Finishing INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| EExtrudehone | Paramount | CA | — | ◇ UNVERIFIED |
| FFFairchild Fastener Group Rosan | Santa Ana | CA | — | ◇ UNVERIFIED |
| FLFbf Limited Dba Queen City Steel Treating CO | Cincinnati | OH | — | ◇ UNVERIFIED |
| FDFederal-mogul Driveline Products | Forest View | IL | — | ◇ UNVERIFIED |
| FLFlight Labs LLC | Phoenix | AZ | — | ◇ UNVERIFIED |
| FLFpm LLC | Itasca | IL | — | ◇ UNVERIFIED |
| GIGallmar Industries, LLC | Oshkosh | WI | — | ◇ UNVERIFIED |
 Gerdau Macsteel, INC. | Canton | OH | — | ◇ UNVERIFIED |
| GMGerdau Mt Hope Facility | Lansing | MI | — | ◇ UNVERIFIED |
| GSGerdau Special Steel North America | Pleasant Prairie | WI | — | ◇ UNVERIFIED |
| GIGlenbrook II, LLC | Milwaukee | WI | — | ◇ UNVERIFIED |
| GPGretener Prototype Engineering | Paso Robles | CA | — | ◇ UNVERIFIED |
| HIH-a Industries-div of A.m. Castle & CO | Hammond | IN | — | ◇ UNVERIFIED |
| HEHalethorpe Extrusions INC | Baltimore | MD | — | ◇ UNVERIFIED |
| HTHalstead Thermal Processing | Lakewood | OH | — | ◇ UNVERIFIED |
| HPHarris Products Group | Carthage | TN | — | ◇ UNVERIFIED |
| HTHeat Treating Services CO. | Pontiac | MI | — | ◇ UNVERIFIED |
| HTHeat Treating Services CORP of America - Plant 1 | Pontiac | MI | — | ◇ UNVERIFIED |
| HHH & H Commercial Heat Treating Inc | Muncie | IN | — | ◇ UNVERIFIED |
| HSHigh Speed Steel Treating CO | Montclair | CA | — | ◇ UNVERIFIED |
| HTHi Tech Heat Treating INC | Gardena | CA | — | ◇ UNVERIFIED |
| HIHitecmetal, INC. (1318007731) | Cleveland | OH | — | ◇ UNVERIFIED |
| HTHi Tecmetal, INC. Bmt (1318007817) | Cleveland | OH | — | ◇ UNVERIFIED |
| HLHi-temp, LLC | Northlake | IL | — | ◇ UNVERIFIED |
| HTH&l Tooth-'precision Heat Trea | Montebello | CA | — | ◇ UNVERIFIED |
| HSH&m South INC | Jacksonville | FL | — | ◇ UNVERIFIED |
| HMH & M West, INC. | Glendale | AZ | — | ◇ UNVERIFIED |
| HHHouston Heat Treating Division of Bodycote Lindberg | Houston | TX | — | ◇ UNVERIFIED |
 Hydro Honing Laboratories | East Hartford | CT | — | ◇ UNVERIFIED |
| IAImg Altair, LLC Subsidiary of Ichor Systems | Fremont | CA | — | ◇ UNVERIFIED |
| IDImt Duncan LLC | Duncan | SC | — | ◇ UNVERIFIED |
| IHIndustrial Heat Treating INC | Quincy | MA | — | ◇ UNVERIFIED |
| INInland Nw Metallurgical Servic | Spokane | WA | — | ◇ UNVERIFIED |
| INInland Nw Metallurgical Svs INC | Spokane | WA | — | ◇ UNVERIFIED |
 International Metallurgical Services INC Dba Scarrott Metallurgical Company | Los Angeles | CA | — | ◇ UNVERIFIED |
| IIIpsen INC | Roselle | NJ | — | ◇ UNVERIFIED |
| IHIronbound Heat Treating CO | Roselle | NJ | — | ◇ UNVERIFIED |
 ISO Finishing LLC | Ramseur | NC | — | ◇ UNVERIFIED |
| JHJames Heritage Ltd | Berthoud | CO | — | ◇ UNVERIFIED |
| JHJasco Heat Treating INC | Fairport | NY | — | ◇ UNVERIFIED |
| JCJ C Renfroe & Son INC | Jacksonville | FL | — | ◇ UNVERIFIED |
| KLKamax L P Hamtramck | Hamtramck | MI | — | ◇ UNVERIFIED |
| KWKck Welding | Madisonville | KY | — | ◇ UNVERIFIED |
| KSKenney Steel Treating CORP | Kearny | NJ | — | ◇ UNVERIFIED |
| LHLark Heat Treating | Houston | TX | — | ◇ UNVERIFIED |
| LILee Industrial Services INC. (crossville) | Crossville | AL | — | ◇ UNVERIFIED |
| LTLh Thompson Steel LLC | Paulding | OH | — | ◇ UNVERIFIED |
| LHLiberty Heat Treating CO INC | Ozone Park | NY | — | ◇ UNVERIFIED |
| LHLindberg Heat Treat | Norwood | MA | — | ◇ UNVERIFIED |
| LHLindberg Heat Treating | Boston | MA | — | ◇ UNVERIFIED |
| LAL&M Architectural Signs | Boonton | NJ | — | ◇ UNVERIFIED |
| LBLo-temp Brazing CO INC | Toledo | OH | — | ◇ UNVERIFIED |
| MSMarcegaglia Stainless Richburg LLC | Richburg | SC | — | ◇ UNVERIFIED |
| MDMaterials Developement Corporation | Medford | MA | — | ◇ UNVERIFIED |
| MIMay Industries | Phoenix | AZ | — | ◇ UNVERIFIED |
| MFMechanical Finishers INC LLC | Cincinnati | OH | — | ◇ UNVERIFIED |
| MIMed-tek INC | Minneapolis | MN | — | ◇ UNVERIFIED |
 Mega Precision INC | Weston | FL | — | ◇ UNVERIFIED |
| Mega Precision INC | Davie | FL | — | ◇ UNVERIFIED |
| MMMelampy Manufacturing CO. | Gibsonia | PA | — | ◇ UNVERIFIED |
| MIMetal Improvement | Houston | TX | — | ◇ UNVERIFIED |
| MIMetal Improvement CO | Farmingdale | NY | — | ◇ UNVERIFIED |
| MIMetal Improvement Co, Curtis-wright CORP | Vernon | CA | — | ◇ UNVERIFIED |
| MJMetal Joining INC | Phoenix | AZ | — | ◇ UNVERIFIED |
| MPMetallurgical Processing, INC. | New Britain | CT | — | ◇ UNVERIFIED |
| MPMetal Plasma Technology | Valencia | CA | — | ◇ UNVERIFIED |
| MIMetal-tek INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| MIMetal-tek INC | Fridley | MN | — | ◇ UNVERIFIED |
| MTMetal Treating Company | Pittsburgh | PA | — | ◇ UNVERIFIED |
| MIMet-co Industries | Saint Charles | IL | — | ◇ UNVERIFIED |
| MTMetlab/springfield Twp | Wyndmoor | PA | — | ◇ UNVERIFIED |
| MPMIami Peening Services, LLC | Miami | FL | — | ◇ UNVERIFIED |
| MWMichigan Wire Tech LLC | Lowell | MI | — | ◇ UNVERIFIED |
 Mil Spec Heat Treating | Huntington Beach | CA | — | ◇ UNVERIFIED |
| MEMLM Enterprises LLC | Oklahoma City | OK | — | ◇ UNVERIFIED |
| MSMp Steel Corporation | Monaca | PA | — | ◇ UNVERIFIED |
| MAMpt America Corporation Dba Metal Plasma Technology | Valencia | CA | — | ◇ UNVERIFIED |
| NMNational Metal Processing INC | Richmond | KY | — | ◇ UNVERIFIED |
| NSNettleton Steel Treating CO. (1318001253) | Cleveland | OH | — | ◇ UNVERIFIED |
 Nevada Heat Treating | Carson City | NV | — | ◇ UNVERIFIED |
| Nevada Heat Treating, LLC Dba Vitesse Systems-newark, Ca | Newark | CA | — | ◇ UNVERIFIED |
| NBNew Britain Heat Treating | New Britain | CT | — | ◇ UNVERIFIED |
| NMNew Mansfield Brass and Aluminum | New Washington | OH | — | ◇ UNVERIFIED |
 Newton Heat Treating Company, Inc. | City of Industry | CA | — | ◇ UNVERIFIED |
| NINitrex INC | San Jose | CA | — | ◇ UNVERIFIED |
| NINitrex INC. | N Las Vegas | NV | — | ◇ UNVERIFIED |
| NNNitrex Nevada | North Las Vegas | NV | — | ◇ UNVERIFIED |
| NCNortheast Coating Technologies | Kennebunk | ME | — | ◇ UNVERIFIED |
| NPNorth Penn Area 6 Superfund Site Operable Unit 2 Jw Rex Prop | Lansdale | PA | — | ◇ UNVERIFIED |
| OCOklahoma Custom Coating | Seminole | OK | — | ◇ UNVERIFIED |
