| HCHoeganaes CORP | Watsontown | PA | Primary Metal Manufacturing331110 | 20-99 | ● ACTIVE |
| HEHoneywell Electronic Materials | Fombell | PA | Primary Metal Manufacturing331410 | 20-99 | ● ACTIVE |
| HCHowmet CORP - Dover Alloy | Dover | NJ | Primary Metal Manufacturing331221 | 100-499 | ● ACTIVE |
Huntington Alloys Corporation | Huntington | WV | Primary Metal Manufacturing331419 | 500+ | ● ACTIVE |
| HCHuron Casting INC | Pigeon | MI | Primary Metal Manufacturing331513 | 100-499 | ● ACTIVE |
| HCHussey Copper LTD | Eminence | KY | Primary Metal Manufacturing331420 | 100-499 | ● ACTIVE |
| HAHydro Aluminum Metals USA LLC | Henderson | KY | Primary Metal Manufacturing331314 | 20-99 | ● ACTIVE |
| HEHydro Extrusion Portland, INC. | Portland | OR | Primary Metal Manufacturing331316 | 20-99 | ● ACTIVE |
| HEHydro Extrusion USA LLC - Cressona Facility | Cressona | PA | Primary Metal Manufacturing331314 | — | ● ACTIVE |
| IPIndiana Pickling & Processing Company | Portage | IN | Primary Metal Manufacturing331221 | 20-99 | ● ACTIVE |
Indium Corporation of America, the | Clinton | NY | Chemical Manufacturing325998 | — | ● ACTIVE |
Innovative Works INC. | Chesterfield | MI | Primary Metal Manufacturing331210 | — | ● ACTIVE |
Interconnect Solutions CO LLC | Fountain Valley | CA | Primary Metal Manufacturing331513 | 100-499 | ● ACTIVE |
| JNJamestown North America, LLC | Houston | TX | Primary Metal Manufacturing331491 | 20-99 | ● ACTIVE |
Jersey Shore Steel CO | Jersey Shore | PA | Primary Metal Manufacturing331110 | 100-499 | ● ACTIVE |
J. H. Botts, LLC | Joliet | IL | Primary Metal Manufacturing331110 | 20-99 | ● ACTIVE |
J. K. Pulley Company, INC. | Saint Louis | MO | Primary Metal Manufacturing331511 | 20-99 | ● ACTIVE |
| JDJohn Deere Waterloo Works Drivetrain Operations & Foundry | Waterloo | IA | Primary Metal Manufacturing331511 | 500+ | ● ACTIVE |
| JAJupiter Aluminum CORP | Hammond | IN | Primary Metal Manufacturing331315 | 100-499 | ● ACTIVE |
| JAJw Aluminum Company | Goose Creek | SC | Primary Metal Manufacturing331315 | 100-499 | ● ACTIVE |
| KIKaba Ilco Corporation | Rocky Mount | NC | Primary Metal Manufacturing331420 | 100-499 | ● ACTIVE |
| KAKaiser Aluminum Alexco LLC | Chandler | AZ | Primary Metal Manufacturing331316 | 100-499 | ● ACTIVE |
Kaiser Aluminum Fabricated Products, LLC | Florence | AL | Primary Metal Manufacturing331318 | 20-99 | ● ACTIVE |
| KIKamtek INC | Birmingham | AL | Primary Metal Manufacturing331523 | 500+ | ● ACTIVE |
| KCKanthal Corporation | Bethel | CT | Primary Metal Manufacturing331221 | 20-99 | ● ACTIVE |
| KCKawneer CO INC | Bloomsburg | PA | Primary Metal Manufacturing331318 | 100-499 | ● ACTIVE |
Kennametal INC | La Vergne | TN | Primary Metal Manufacturing331491 | 100-499 | ● ACTIVE |
| KCKeymark CORP of Florida | Lakeland | FL | Primary Metal Manufacturing331314 | 100-499 | ● ACTIVE |
| KCKingsbury Castings Division | Kingsbury | IN | Primary Metal Manufacturing331511 | 20-99 | ● ACTIVE |
Kittyhawk INC | Garden Grove | CA | Primary Metal Manufacturing331111 | 20-99 | ● ACTIVE |
Knoxville Sheet Metal Works, INC | Knoxville | TN | Primary Metal Manufacturing331315 | 20-99 | ● ACTIVE |
Kovatch Castings, INC | Uniontown | OH | Primary Metal Manufacturing331512 | 100-499 | ● ACTIVE |
| KIKreisler Industrial Corporation | Elmwood Park | NJ | Primary Metal Manufacturing331111 | 100-499 | ● ACTIVE |
Kuprion, INC. | San Jose | CA | Primary Metal Manufacturing331420 | 20-99 | ● ACTIVE |
Kutztown Foundry & Machine LLC | Kutztown | PA | Primary Metal Manufacturing331513 | 20-99 | ● ACTIVE |
Kvf-quad, Corporation | East Moline | IL | Primary Metal Manufacturing331221 | 20-99 | ● ACTIVE |
Kyocera Senco Industrial Tools, INC | Cincinnati | OH | Primary Metal Manufacturing331222 | 100-499 | ● ACTIVE |
Latrobe Specialty Metals Co, LLC | Latrobe | PA | Chemical Manufacturing325311 | — | ● ACTIVE |
| LEL E Jones CO | Menominee | MI | Primary Metal Manufacturing331110 | 100-499 | ● ACTIVE |
Le Sueur, Incorporated | Le Sueur | MN | Primary Metal Manufacturing331523 | 100-499 | ● ACTIVE |
| LCLibertas Copper | Leetsdale | PA | Primary Metal Manufacturing331410 | 100-499 | ● ACTIVE |
Linear Motion LLC | Saginaw | MI | Primary Metal Manufacturing331111 | 100-499 | ● ACTIVE |
| LHLittlestown Hdwr & Foundry | Littlestown | PA | Primary Metal Manufacturing331524 | 20-99 | ● ACTIVE |
Madden Bolt Corporation | Houston | TX | Primary Metal Manufacturing331210 | 100-499 | ● ACTIVE |
| MLMagpro, LLC | Camden | TN | Primary Metal Manufacturing331410 | 20-99 | ● ACTIVE |
| MEMahle Engine Components USA INC | Mcconnelsville | OH | Primary Metal Manufacturing331314 | 20-99 | ● ACTIVE |
Malin Company | Brookpark | OH | Primary Metal Manufacturing331222 | 20-99 | ● ACTIVE |
| MUMarmon Utility LLC | Seymour | CT | Primary Metal Manufacturing331491 | 100-499 | ● ACTIVE |
| MAMastermelt America LLC | Sweetwater | TN | Primary Metal Manufacturing331410 | 20-99 | ● ACTIVE |
| MIMatalco INC | Wisconsin Rapids | WI | Primary Metal Manufacturing331314 | 20-99 | ● ACTIVE |