| CSCleveland Steel Container CORP | Peotone | 20–99 | ● ACTIVE |
J. H. Botts, LLC | Joliet | 20–99 | ● ACTIVE |
| SHSouth Holland Metal Finishing | Monee | 20–99 | ● ACTIVE |
Ash Manufacturing Company | Plainfield | — | ● ACTIVE |
Calisota Parts, LLC | Frankfort | — | ● ACTIVE |
Cgi Manufacturing Holdings LLC | Romeoville | — | ● ACTIVE |
Chk Holdings LLC | Shorewood | — | ● ACTIVE |
| IMImi Manufacturing INC | Bolingbrook | — | ● ACTIVE |
North American Safety Products, INC | Mokena | — | ● ACTIVE |
Palm Scientific LLC | Naperville | — | ● ACTIVE |
Pewag INC | Bolingbrook | — | ● ACTIVE |
Prismier, LLC | Bolingbrook | — | ● ACTIVE |
Superheat Fgh Services INC | New Lenox | — | ● ACTIVE |
U.s. Hose CORP | Romeoville | — | ● ACTIVE |
Viking Manufacturing INC. | Mokena | — | ● ACTIVE |
| WTWalco Tool & Engineering CORP | Romeoville | — | ● ACTIVE |
X Cel Technologies INC | Tinley Park | — | ● ACTIVE |
| AGAzz Galvanizing-joliet | Joliet | 20–99 | ◐ LIKELY ACTIVE |
| RPRovanco Piping System Inc-treatment Plant | Joliet | 20–99 | ◐ LIKELY ACTIVE |
| AIAmca International | Park Forest | — | ◇ UNVERIFIED |
| ACAnderson Copper and Brass Fittings | Frankfort | — | ◇ UNVERIFIED |
| ECEllwood Chrome Crankshaft CO LLC | Joliet | — | ◇ UNVERIFIED |
| LSLockport Steel Fabricators | Lockport | — | ◇ UNVERIFIED |
| MIMetalstamp INC | Channahon | — | ◇ UNVERIFIED |
| BEBrennan Equipment & Mfg, Inc. | University Park | 100–499 | ◐ LIKELY ACTIVE |
| PCPanduit CORP | Lockport | — | ◐ LIKELY ACTIVE |
| WCWindy City Wire Cable and Technology Products, LLC | Bolingbrook | — | ◐ LIKELY ACTIVE |
| AIAltrachem INC | Joliet | — | ◇ UNVERIFIED |
| ALAmerican Lock CO | Crete | — | ◇ UNVERIFIED |
| CPCeramic Powders INC | Joliet | — | ◇ UNVERIFIED |
| ITInternational Titanium Powder | Lockport | — | ◇ UNVERIFIED |
| JIJernberg Industries INC | Bolingbrook | — | ◇ UNVERIFIED |
| PCPanduit CORP | Romeoville | — | ◇ UNVERIFIED |
| PCPlumbum Casting CO | Romeoville | — | ◇ UNVERIFIED |
| RLReturn Logistics INC | Joliet | — | ◇ UNVERIFIED |
| RTRussell T Bundy Associates INC Dba Pan Glo Chicago | Rockdale | — | ◇ UNVERIFIED |
| AWAnyweld Welding and Fabrication LLC | Manhattan | — | ◐ LIKELY ACTIVE |
| AWAnzelc Welding & Fabricating, INC. | Rockdale | — | ◐ LIKELY ACTIVE |
| AWArcher Wire International Tinley Park | Tinley Park | 100–499 | ◐ LIKELY ACTIVE |
| BPBkt Parts LLC | Crete | — | ◐ LIKELY ACTIVE |
| CFCommercial Fluid Power LLC | University Park | — | ◐ LIKELY ACTIVE |
| CBCrane Bolingbrook | Bolingbrook | 20–99 | ◐ LIKELY ACTIVE |
| EMElite Manufacturing Technologies LLC | Romeoville | 20–99 | ◐ LIKELY ACTIVE |
| MMain | Romeoville | 20–99 | ◐ LIKELY ACTIVE |
| MLMckinnon Logistics LLC | Crete | — | ◐ LIKELY ACTIVE |
| MIMultitech Industries, Inc. | Bolingbrook | 20–99 | ◐ LIKELY ACTIVE |
| PCPrater Corporate | Bolingbrook | 20–99 | ◐ LIKELY ACTIVE |
| SJSumco Joliet | Joliet | 20–99 | ◐ LIKELY ACTIVE |
| SSuperheat | New Lenox | 100–499 | ◐ LIKELY ACTIVE |
| WEWest End Tool & Die | Joliet | 20–99 | ◐ LIKELY ACTIVE |