| CSClassic Sheet Metal, INC. | Franklin Park | — | ◇ UNVERIFIED |
| CACmp Associates INC. | Elk Grove Village | — | ◇ UNVERIFIED |
| CCCoi CO | Chicago | — | ◇ UNVERIFIED |
| CCColumbia Chutes, LLC | Wheeling | — | ◇ UNVERIFIED |
| CTColumbia Tool and Gage Company | Wheeling | — | ◇ UNVERIFIED |
| CWContinental Windows and Glass Corporation | Chicago | — | ◇ UNVERIFIED |
| CWCooley Wire Products Manufacturing Company | Schiller Park | — | ◇ UNVERIFIED |
| CFCorcoran Fabrication & Design, Inc. | Bedford Park | — | ◇ UNVERIFIED |
| CMCosmos Manufacturing, INC. | South Chicago Heights | — | ◇ UNVERIFIED |
| CMCovey Machine, INC. | Chicago | — | ◇ UNVERIFIED |
| CCCraftsman Custom Metals, LLC | Schiller Park | — | ◇ UNVERIFIED |
| CSCryogenic Systems Equipment, INC. | Blue Island | — | ◇ UNVERIFIED |
| CECutting Edge Industries Incorporated | Franklin Park | — | ◇ UNVERIFIED |
| DDD5 Design and Metal Fabrication, LLC | Chicago | — | ◇ UNVERIFIED |
| DTDart Technology, INC. | Schaumburg | — | ◇ UNVERIFIED |
| DPDemco Products | Oak Lawn | — | ◇ UNVERIFIED |
| DCDiameters Corporation | Chicago Heights | — | ◇ UNVERIFIED |
| DMDiebel Manufacturing CO | Morton Grove | — | ◇ UNVERIFIED |
| DCDuffy CO | Palatine | — | ◇ UNVERIFIED |
| DLDynacron LLC | Chicago | — | ◇ UNVERIFIED |
| EHEBC Holdings LLC | Elk Grove Village | — | ◇ UNVERIFIED |
| EIEconomy Iron, INC. | Melrose Park | — | ◇ UNVERIFIED |
| EIEHR Industries, Inc. | Maywood | — | ◇ UNVERIFIED |
| ELElite Labor Services, LTD. | Wheeling | — | ◇ UNVERIFIED |
| EJEnamelers & Japanners INC | Chicago | — | ◇ UNVERIFIED |
| FMFabricated Metals CO. | Elk Grove Village | — | ◇ UNVERIFIED |
| FMFabtec Manufacturing, INC. | Franklin Park | — | ◇ UNVERIFIED |
| FIFanmar INC. | Bedford Park | — | ◇ UNVERIFIED |
| FEFerguson Enterprises LLC #2778 | South Holland | — | ◇ UNVERIFIED |
| FTFountain Technologies, LTD. | Wheeling | — | ◇ UNVERIFIED |
| FWFrank's Welding & Manufacturing Company | Melrose Park | — | ◇ UNVERIFIED |
| FAFuture Additive Manufacturing Aerospace, Inc | Chicago | — | ◇ UNVERIFIED |
| GIG5 Investment Group LLC | Elk Grove Village | — | ◇ UNVERIFIED |
| GSGkn Sinter Metals | Richton Park | — | ◇ UNVERIFIED |
| HPHarris Precision Tools, INC. | Chicago Ridge | — | ◇ UNVERIFIED |
| HFHb Fuller Company | Northbrook | — | ◇ UNVERIFIED |
| HPHelms Performance Group, INC. Dba Christy Metals/chris Industries/chris Plating | Northbrook | — | ◇ UNVERIFIED |
| HWHenderson Welding, INC. | Chicago | — | ◇ UNVERIFIED |
| HMHeritage Manufacturing, Inc. | Franklin Park | — | ◇ UNVERIFIED |
| HMHighland Metal, INC. | Hillside | — | ◇ UNVERIFIED |
| HWHi-grade Welding and Manufacturing, LLC | Elk Grove Village | — | ◇ UNVERIFIED |
| HLHi-temp, LLC | Northlake | — | ◇ UNVERIFIED |
| IGIbarra Group LLC | Chicago | — | ◇ UNVERIFIED |
| IIImpact Iron, LLC | Arlington Heights | — | ◇ UNVERIFIED |
| INItw NA Metal Fasteners | Broadview | — | ◇ UNVERIFIED |
| ISItw Shakeproof | Broadview | — | ◇ UNVERIFIED |
| ISItw Shakeproof Industrial Threaded Products | Chicago | — | ◇ UNVERIFIED |
| JPJames Precious Metals Plating, INC. | Chicago | — | ◇ UNVERIFIED |
| JMJ.b. Metal Works, INC. | Des Plaines | — | ◇ UNVERIFIED |
| JPJensen Plating Works INC | Chicago | — | ◇ UNVERIFIED |
