| GCGunite Corporation | Rockford | IL | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| KCKettler Casting CO INC | Belleville | IL | Primary Metal Manufacturing331511 | 20-99 | ◐ LIKELY ACTIVE |
| KSKeystone Steel & Wire CO | Peoria | IL | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| LALynch Aluminum MFG Co | Peoria | IL | Primary Metal Manufacturing331318 | 20-99 | ◐ LIKELY ACTIVE |
| MMMandel Metals INC. | Franklin Park | IL | Primary Metal Manufacturing331312 | 20-99 | ◐ LIKELY ACTIVE |
| MLMaruichi Leavitt Pipe & Tube | Chicago | IL | Primary Metal Manufacturing331210 | 100-499 | ◐ LIKELY ACTIVE |
| MMMayco Mfg LLC | Granite City | IL | Primary Metal Manufacturing331410 | — | ◐ LIKELY ACTIVE |
| NENehring Electrical Works/Conex Cable | Dekalb | IL | Primary Metal Manufacturing331221 | 100-499 | ◐ LIKELY ACTIVE |
| NSNelsen Steel & Wire LP | Franklin Park | IL | Primary Metal Manufacturing331221 | — | ◐ LIKELY ACTIVE |
| NSNippon Sharyo Manufacturing LLC | Rochelle | IL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
Reynolds Consumer Products LLC | Wheeling | IL | Primary Metal Manufacturing331313 | 100-499 | ◐ LIKELY ACTIVE |
| RIRiverdale Industries LLC | Riverdale | IL | Chemical Manufacturing325910 | 20-99 | ◐ LIKELY ACTIVE |
| SCSpectrulite Consortium Incorporated | Madison | IL | Primary Metal Manufacturing331315 | — | ◐ LIKELY ACTIVE |
| TDT & D Metal Products | Watseka | IL | Primary Metal Manufacturing331221 | 100-499 | ◐ LIKELY ACTIVE |
| TCTechalloy CO INC | Union | IL | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| WIWebco Industries | Lyndon | IL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
Wieland Rolled Products North America, LLC | East Alton | IL | Primary Metal Manufacturing331420 | — | ◐ LIKELY ACTIVE |
| ACAir Caster LLC | Decatur | IL | Primary Metal Manufacturing331221 | 1-19 | ◐ LIKELY ACTIVE |
| ASAmerican Steel Foundries - Granite City | Granite City | IL | Primary Metal Manufacturing331513 | — | ◐ LIKELY ACTIVE |
| ACArntzen CORP | Woodstock | IL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| ACArntzen CORP | Rockford | IL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| CCCentury Castings CORP | Belleville | IL | Primary Metal Manufacturing331529 | 20-99 | ◐ LIKELY ACTIVE |
| CFCerro Flow Products LLC | Sauget | IL | Primary Metal Manufacturing331420 | — | ◐ LIKELY ACTIVE |
| CMCharter Manufacturing CO INC | Woodstock | IL | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| CSCorey Steel CO | Cicero | IL | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| EBElectron Beam Technologies INC | Kankakee | IL | Primary Metal Manufacturing331420 | 20-99 | ◐ LIKELY ACTIVE |
| ESElgiloy Specialty Metals | Sycamore | IL | Primary Metal Manufacturing331222 | — | ◐ LIKELY ACTIVE |
| ESElgiloy Specialty Metals | Hampshire | IL | Primary Metal Manufacturing331221 | — | ◐ LIKELY ACTIVE |
| FMFrantz Mfg CO | Sterling | IL | Primary Metal Manufacturing331222 | 20-99 | ◐ LIKELY ACTIVE |
| GEGateway Energy & Coke CO LLC | Granite City | IL | Petroleum and Coal Products Manufacturing324199 | — | ◐ LIKELY ACTIVE |
| HSHanna Steel CORP | Pekin | IL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| MCMaclean-fogg Component Systems | Mundelein | IL | Primary Metal Manufacturing331221 | — | ◐ LIKELY ACTIVE |
| MSMain Steel Polishing CO INC | Elk Grove Village | IL | Primary Metal Manufacturing331221 | — | ◐ LIKELY ACTIVE |
| MMMid-west Manufacturing CO | Chicago Heights | IL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| MCMueller CO | Decatur | IL | Primary Metal Manufacturing331529 | — | ◐ LIKELY ACTIVE |
| MCMueller CO | Decatur | IL | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| MCMueller CO | Decatur | IL | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| NENehring Electrical Works CO | Dekalb | IL | Primary Metal Manufacturing331319 | — | ◐ LIKELY ACTIVE |
| NANichols Aluminum LLC | Lincolnshire | IL | Primary Metal Manufacturing331315 | — | ◐ LIKELY ACTIVE |
| NTNucor Tubular Products INC | Marseilles | IL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| OWOlin Winchester LLC | East Alton | IL | Primary Metal Manufacturing331420 | — | ◐ LIKELY ACTIVE |
| PAPrecision Aluminum - Foundry Division | Rock Island | IL | Primary Metal Manufacturing331524 | — | ◐ LIKELY ACTIVE |
| RAReal Alloy Recycling LLC | Chicago Heights | IL | Primary Metal Manufacturing331314 | — | ◐ LIKELY ACTIVE |
| SPSims Precious Metals | Franklin Park | IL | Primary Metal Manufacturing331420 | — | ◐ LIKELY ACTIVE |
| SSSkyline Steel | Newton | IL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| TATialco Aluminum LLC | Chicago Heights | IL | Primary Metal Manufacturing331313 | — | ◐ LIKELY ACTIVE |
| UEUniversal Electric Foundry INC | Chicago | IL | Primary Metal Manufacturing331513 | — | ◐ LIKELY ACTIVE |
| UMUniversal Metal Service CORP | South Holland | IL | Primary Metal Manufacturing331221 | — | ◐ LIKELY ACTIVE |
| WRWieland Rolled Products NA - East Alton Casting Plant | East Alton | IL | Primary Metal Manufacturing331420 | — | ◐ LIKELY ACTIVE |
| AMAllied Metal CO | Chicago | IL | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |