| MMMaass Midwest Manufacturing INC | Huntley | IL | Primary Metal Manufacturing331529 | — | ◇ UNVERIFIED |
| AMAllied Metal CO | Chicago | IL | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| ACArntzen CORP | Woodstock | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| ACArntzen CORP | Rockford | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CFCerro Flow Products LLC | Sauget | IL | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| CMCharter Manufacturing CO INC | Woodstock | IL | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CCColeman Cable INC | Waukegan | IL | Primary Metal Manufacturing331422 | — | ◇ UNVERIFIED |
| CSCorey Steel CO | Cicero | IL | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| ESElgiloy Specialty Metals | Hampshire | IL | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| HSHanna Steel CORP | Pekin | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| HWHorning Wire CORP | Lake Zurich | IL | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| MCMaclean-fogg Component Systems | Mundelein | IL | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| MIMetal-matic INC | Bedford Park | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| MIMidland Industries INC | Chicago | IL | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| MCMueller CO | Decatur | IL | Primary Metal Manufacturing331529 | — | ◇ UNVERIFIED |
| MCMueller CO | Decatur | IL | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| NENehring Electrical Works CO | Dekalb | IL | Primary Metal Manufacturing331319 | — | ◇ UNVERIFIED |
| NTNucor Tubular Products INC | Marseilles | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| PAPrecision Aluminum - Foundry Division | Rock Island | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| RRRock River Fabrications | Lyndon | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SPSims Precious Metals | Franklin Park | IL | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| UEUniversal Electric Foundry INC | Chicago | IL | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| UMUniversal Metal Service CORP | South Holland | IL | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| WMWh Maze CO | Peru | IL | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| WRWieland Rolled Products NA - East Alton Casting Plant | East Alton | IL | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| ASArlington Structural Steel | Arlington Heights | IL | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| TCTricast/presfore CORP | Crystal Lake | IL | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| AWA-1 Wire Tech INC. | Rockford | IL | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| AIAbc-naco INC | Chicago Heights | IL | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
 Ace Metal Crafts CO | Franklin Park | IL | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| ADAdc Diecasting LLC | Elk Grove Village | IL | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| ALAdc LP | Wheeling | IL | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| AAAdvantage Automation Midwest INC | Decatur | IL | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| AFA Finkl & Sons CO | Chicago | IL | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| AFAlcasco Foundry | Harvey | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| ATAlliance Tubular Holdings LLC | Dixmoor | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| ADAllied Die Casting CORP | Mchenry | IL | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| AKAltman & Koehler Foundry CO INC | Chicago | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| ARAltman Ron | Chicago | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| AAlumetco | Chicago | IL | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| AAAlways Aluminum | Rockford | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| AIAmcast INC | Bensenville | IL | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| AEAmco Engineering CO | Schiller Park | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| APAmerican Precision Castings INC | Chicago | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| ASAmerican Stair CORP | Romeoville | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| AMAmes Metal Products CO | Chicago | IL | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| AMAmpco Metal INC. | Arlington Heights | IL | Primary Metal Manufacturing331525 | — | ◇ UNVERIFIED |
| AHArcelormittal Hennepin LLC | Hennepin | IL | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| APArrow Pattern and Foundry CO | Bridgeview | IL | Primary Metal Manufacturing331528 | — | ◇ UNVERIFIED |
| AFAtherton Foundry Products INC | Riverdale | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
