| AMAllied Metal CO | Chicago | IL | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| CCColeman Cable INC | Waukegan | IL | Primary Metal Manufacturing331422 | — | ◇ UNVERIFIED |
| BCBranchfield Casting | Galva | IL | Primary Metal Manufacturing331513 | 20-99 | ◇ UNVERIFIED |
| CPCastwell Products INC | Skokie | IL | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CBCentury Brass Works INC | Swansea | IL | Primary Metal Manufacturing331522 | 1-19 | ◇ UNVERIFIED |
| CCConex Cable LLC | Dekalb | IL | Primary Metal Manufacturing331316 | 20-99 | ◇ UNVERIFIED |
| IWIllini Wire Works INC | Olney | IL | Primary Metal Manufacturing331222 | 20-99 | ◇ UNVERIFIED |
| NMNational Metalwares L.p. | Aurora | IL | Primary Metal Manufacturing331210 | 100-499 | ◇ UNVERIFIED |
| OSOakley Steel Products CO | Bellwood | IL | Primary Metal Manufacturing331111 | 20-99 | ◇ UNVERIFIED |
| PTPlymouth Tube CO | Streator | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TCTricast/presfore CORP | Crystal Lake | IL | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| WFWestwick Foundry LTD | Galena | IL | Primary Metal Manufacturing331511 | 1-19 | ◇ UNVERIFIED |
| AWA-1 Wire Tech INC. | Rockford | IL | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
 Ace Metal Crafts CO | Franklin Park | IL | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| ADAdc Diecasting LLC | Elkgrove 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 |
| BMBase Metals Group | Alsip | IL | Primary Metal Manufacturing331419 | — | ◇ UNVERIFIED |
| BIBee-jay Industries INC | Harwood Heights | IL | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| BIBehr Iron & Metal | Peoria | IL | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| BEBromley Excavating | Centralia | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| BMBull Moose Tube CO | Chicago Heights | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CMCallen Manufacturing CORP | Northlake | IL | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| CPCannon Precision Manufacturing | Keithsburg | IL | Primary Metal Manufacturing331000 | — | ◇ UNVERIFIED |
| CECapitol Engineering & Manufacturing CO | Harvey | IL | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
 Cast Technologies INC. | Peoria | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| CDCentral Die Casting | Chicago | IL | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| CSCentral Steel & Wire CO | Chicago | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CECertified Equip & Mfg CO | Springfield | IL | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CFChester Foundry | Chester | IL | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| CAChicago Aluminum Castings CO INC | Chicago | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| CPChris Plating | Northbrook | IL | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CRCimco Recycling | Marion | IL | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
