| 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 |
