| CCCai Custom Alloys, INC. | Belvidere | IL | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| CICaterpillar INC. | Mapleton | IL | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CSCentral Steel & Wire | University Park | IL | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| CCCentury Casting Corporation | Belleville | IL | Primary Metal Manufacturing331522 | — | ◇ UNVERIFIED |
| CCCentury Castings Corporation | Swansea | IL | Primary Metal Manufacturing331529 | — | ◇ UNVERIFIED |
| CSCharter Steel Trading | Chicago | IL | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| CHChicago Heights Brass Foundry, INC. | Chicago Heights | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| CVChicago Vacuum Castings CORP | Chicago | IL | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| CWChicago White Metal | Bensenville | IL | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| CSCi Starnes Products CO | Edwardsville | IL | Primary Metal Manufacturing331312 | — | ◇ UNVERIFIED |
| CSC&j Sales | Chatham | IL | Primary Metal Manufacturing331525 | — | ◇ UNVERIFIED |
| CSClingan Steel, INC. | Des Plaines | IL | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CFCmi Frank S Ryan Memorial | Des Plaines | IL | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CSCobin Salvage Yard INC | Dowell | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| CCColeman Cable INC | North Chicago | IL | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| CMCompeer Metals, INC. | Algonquin | IL | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| CMContinental Metals INC | Lasalle | IL | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| CCCopperweld Chicago Division | Chicago | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CCCountry Cast Products INC | Galena | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| CSCrane & Steel Inc.* | Addison | IL | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CSCw Shumway & Sons | Batavia | IL | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| DCDeniston CO | Alsip | IL | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| DIDima Industries | Elk Grove Village | IL | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| DDDo-rite Die & Engineering Company | Chicago Heights | IL | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| DMDulin Metals CO | Joliet | IL | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| DPDurable Packaging International, INC. | Lincolnshire | IL | Primary Metal Manufacturing331319 | — | ◇ UNVERIFIED |
| DIDuro-cast, INC. | Somonauk | IL | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| FIFlexmag Industries, INC. | Marengo | IL | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| FCFluxxor Corporation | North Aurora | IL | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| FNFrancis & Nygren Foundry CO | Chicago | IL | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| GCGalesburg Castings INC | Galesburg | IL | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| GWGeorge Wilson | Danville | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| GMGfi Metal Treating INC | Rockford | IL | Primary Metal Manufacturing331410 | — | ◇ UNVERIFIED |
| GBGlobal Brass and Copper LLC Dba Olin Brass | East Alton | IL | Primary Metal Manufacturing331421 | — | ◇ UNVERIFIED |
| GBGlobal Brass and Copper LLC Dba Olin Brass | East Alton | IL | Primary Metal Manufacturing331421 | — | ◇ UNVERIFIED |
| GIGrand Iron Work INC. | Chicago | IL | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| HFHandi Foil | Antioch | IL | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| HCHandi-foil CORP. | Naperville | IL | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
 Handi Products, INC. Dba Handi-ramp, INC. | Libertyville | IL | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| HDHeick Die Casting CORP | Chicago | IL | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| HPHutchinson Products LLC | Alton | IL | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| IKIce Krackers, INC. | Springfield | IL | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| INIllinois Ni Cast, LLC | Champaign | IL | Primary Metal Manufacturing331528 | — | ◇ UNVERIFIED |
| IWIllinois Weld & Machine, INC. | Hanna City | IL | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| IPIndustrial Properties of Palatine, LLC | Palatine | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| JIJernberg Industries INC | Chicago | IL | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| JWJerry's Welding INC. | Elgin | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| JBJjj Brass & Aluminum Foundry, LLC | South Beloit | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| KMKellerman Manufacturing Company INC. | Wauconda | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| KIK.n.m. Industries, INC. Dba Lexco Cable | Norridge | IL | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
