Acme Alliance LLC | Northbrook | 100–499 | ● ACTIVE |
| ATAllied Tube & Conduit Corporation | Harvey | — | ● ACTIVE |
| ASAlton Steel INC | Alton | 100–499 | ● ACTIVE |
Alu-bra Foundry, INC. | Bensenville | 20–99 | ● ACTIVE |
Ark Technologies, INC. | Saint Charles | 20–99 | ● ACTIVE |
| AMAurora Metals Division LLC | Montgomery | 20–99 | ● ACTIVE |
Calumet Brass Foundry, INC | Dolton | 1–19 | ● ACTIVE |
Cast Aluminum Solutions, LLC | Batavia | 100–499 | ● ACTIVE |
Cast Technologies INC | Peoria | 20–99 | ● ACTIVE |
| CHChicago Heights Steel | Chicago Heights | 100–499 | ● ACTIVE |
Chicago Magnesium Casting CO | Blue Island | — | ● ACTIVE |
Dynacast, LLC | Elgin | 100–499 | ● ACTIVE |
| HSHeidtman Steel Products INC | Granite City | 20–99 | ● ACTIVE |
H. Kramer & CO | Chicago | 100–499 | ● ACTIVE |
J. H. Botts, LLC | Joliet | 20–99 | ● ACTIVE |
Kvf-quad, Corporation | East Moline | 20–99 | ● ACTIVE |
| PCPrysmian Cables & Systems USA LLC | Du Quoin | 100–499 | ● ACTIVE |
| SMSipi Metals CORP | Chicago | 100–499 | ● ACTIVE |
Spartan Light Metal Products, INC. | Sparta | 100–499 | ● ACTIVE |
| TSTaubensee Steel and Wire CO | Wheeling | 100–499 | ● ACTIVE |
Titan Wheel Corporation of Illinois | Quincy | 500+ | ● ACTIVE |
| WIWirco INC | Champaign | 20–99 | ● ACTIVE |
A. Finkl & Sons CO. | Chicago | — | ● ACTIVE |
Allied Locke Industries INC | Dixon | — | ● ACTIVE |
Anchor-harvey Components LLC | Freeport | — | ● ACTIVE |
| CTCain Tubular Products, INC | Saint Charles | — | ● ACTIVE |
Central Wire, INC. | Union | 20–99 | ● ACTIVE |
| CMChicago Metal Rolled Products Company | Chicago | 20–99 | ● ACTIVE |
Combined Metals Company, LLC | Elgin | 20–99 | ● ACTIVE |
Combined Metals Company LLC - Hampshire | Hampshire | 100–499 | ● ACTIVE |
Coogee Magnesium LLC | Ottawa | — | ● ACTIVE |
| CACustom Aluminum Products | Genoa | 100–499 | ● ACTIVE |
| CACustom Aluminum Products INC | South Elgin | 100–499 | ● ACTIVE |
Indium Corporation of America, the | Elk Grove Village | — | ● ACTIVE |
Teledyne Defense Electronics, LLC | Woodridge | — | ● ACTIVE |
Toyal America INC | Lockport | — | ● ACTIVE |
Wieland Rolled Products North America, LLC | East Alton | — | ● ACTIVE |
| WFWinnebago Foundry INC | South Beloit | 20–99 | ● ACTIVE |
| AAAlbaksan Advanced Copper Alloys LLC | Sugar Grove | — | ● ACTIVE |
Associated Fastening Products, INC. | Itasca | — | ● ACTIVE |
| MMMayco Manufacturing LLC dba Mayco Industries | Granite City | 20–99 | ● ACTIVE |
| RCReynolds Consumer Products LLC | Lake Forest | — | ● ACTIVE |
Round Ground Metals, INC. | Hanover Park | — | ● ACTIVE |
Tri Star Metals, LLC | Aurora | — | ● ACTIVE |
| AAAlpha Assembly Solutions INC | Itasca | 100–499 | ◐ LIKELY ACTIVE |
| AHAmerican Highway | Kankakee | 20–99 | ◐ LIKELY ACTIVE |
| ABAnchor Brake Shoe CO | West Chicago | 20–99 | ◐ LIKELY ACTIVE |
| ATAtlas Tube INC | Chicago | 100–499 | ◐ LIKELY ACTIVE |
| AGAzz Galvanizing Peoria | Peoria | 20–99 | ◐ LIKELY ACTIVE |
| GDG&m Die Casting CO INC | Wood Dale | 20–99 | ◐ LIKELY ACTIVE |