| BIBellwood Industrial Plating INC | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| BMBenchmark Mold Service Holdings CORP | Addison | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| BJBeno J Gundlach CO | Belleville | IL | Fabricated Metal Product Manufacturing332216 | — | ◇ UNVERIFIED |
| BDBenton Drumming CORP | Granite City | IL | Fabricated Metal Product Manufacturing332439 | — | ◇ UNVERIFIED |
| BPBerge Plating Work INC | Rock Island | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| BUBerger US INC | Chicago | IL | Fabricated Metal Product Manufacturing332439 | — | ◇ UNVERIFIED |
| BPBerteau-lowell Plating Plating INC | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| B3Big 3 Precision Prod INC | Centralia | IL | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| BMBiltrite Metal Products | Leland | IL | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| BDBl Downey CO LLC | Broadview | IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| BTBluewater Thermal Solutions Chicago 1 | Northlake | IL | Fabricated Metal Product Manufacturing332811 | — | ◇ UNVERIFIED |
| BTBodycote Thermal Processing | Melrose Park | IL | Fabricated Metal Product Manufacturing332811 | — | ◇ UNVERIFIED |
| BTBoley Tool & Machine | East Peoria | IL | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| BFBrad Foote Gear Works INC | Cicero | IL | Fabricated Metal Product Manufacturing332111 | — | ◇ UNVERIFIED |
| BIBradford Industries | Bradford | IL | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| BCBradley Coatings | Saint Charles | IL | Fabricated Metal Product Manufacturing332722 | — | ◇ UNVERIFIED |
| BABrandis Aircraft | Taylorville | IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| BGBrightly Galvanized Products | Cicero | IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| BPBrownies Polishing Shop | Ringwood | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| BTB & T Polishing INC | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| BMButler Manufacturing CO | Galesburg | IL | Fabricated Metal Product Manufacturing332116 | — | ◇ UNVERIFIED |
| BCBway Corporation | Chicago | IL | Fabricated Metal Product Manufacturing332431 | — | ◇ UNVERIFIED |
| BPBway Packaging | Franklin Park | IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| CPCalco Plating CO | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CACalumet Armature & Electric LLC | Riverdale | IL | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| CICamcraft INC | Bartlett | IL | Fabricated Metal Product Manufacturing332721 | — | ◇ UNVERIFIED |
| CICasting Impregnators INC | Franklin Park | IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| CSCbi Services INC | Bourbonnais | IL | Fabricated Metal Product Manufacturing332313 | — | ◇ UNVERIFIED |
| CTCentury Tool & Mfg CO | Cherry Valley | IL | Fabricated Metal Product Manufacturing332111 | — | ◇ UNVERIFIED |
| CPCeramic Powders INC | Joliet | IL | Fabricated Metal Product Manufacturing332618 | — | ◇ UNVERIFIED |
| CECertified Equip & Mfg CO | Springfield | IL | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CTCertified Tool & Mfg | Elk Grove Village | IL | Fabricated Metal Product Manufacturing332116 | — | ◇ UNVERIFIED |
| CHCfm Harris Systems INC | Skokie | IL | Fabricated Metal Product Manufacturing332510 | — | ◇ UNVERIFIED |
| CLChem-cast LTD | Danville | IL | Fabricated Metal Product Manufacturing332997 | — | ◇ UNVERIFIED |
| CIChem-plate Industries INC | Maywood | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
 Chem Processing | Rockford | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CFChicago Faucet CO | Des Plaines | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CPChicago Plating INC | Chicago | IL | Fabricated Metal Product Manufacturing332313 | — | ◇ UNVERIFIED |
| CPChicago Powdered Metal Products CO | Schiller Park | IL | Fabricated Metal Product Manufacturing332117 | — | ◇ UNVERIFIED |
| CSChicago Steel Rule Die & Fabricators CO | Chicago | IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| CTChicago Title Land Trust | Chicago | IL | Fabricated Metal Product Manufacturing332439 | — | ◇ UNVERIFIED |
| CIChrometec Industries LLC | Lombard | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CPChromold Plating INC | Mchenry | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CRCimco Resources | Rock Falls | IL | Fabricated Metal Product Manufacturing332510 | — | ◇ UNVERIFIED |
| CMCircle Metal Specialties INC | Alsip | IL | Fabricated Metal Product Manufacturing332116 | — | ◇ UNVERIFIED |
| CMClybourn Metal Finishing CO | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CCCmc Coating Toltec Steel | Kankakee | IL | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| CMCoating Methods INC | Carpentersville | IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| CACoatings Applications INC | Elk Grove Village | IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| CMCoffman Mfg CORP | Cary | IL | Fabricated Metal Product Manufacturing332410 | — | ◇ UNVERIFIED |
