| SLSerra Laser Precision, LLC | Libertyville | — | ◐ LIKELY ACTIVE |
| SCSilgan Containers Manufacturing CORP | Hoopeston | — | ◐ LIKELY ACTIVE |
| SPSkild Plating INC | Chicago | — | ◐ LIKELY ACTIVE |
| SISpringfield INC | Geneseo | — | ◐ LIKELY ACTIVE |
| SMSurface Manufacturing CO | Capron | — | ◐ LIKELY ACTIVE |
| TSTcr Systems LLC | Decatur | — | ◐ LIKELY ACTIVE |
| TMT&l Manufacturing | Aurora | — | ◐ LIKELY ACTIVE |
| VVVal-matic Valve & Mfg | Elmhurst | — | ◐ LIKELY ACTIVE |
| 5A5th Ave Coating Svc Ctr | East Moline | — | ◇ UNVERIFIED |
| 6W6633 West 65th Street LLC | Bedford Park | — | ◇ UNVERIFIED |
| 8T875 Tollgate | Elgin | — | ◇ UNVERIFIED |
| AFAbbey Finishing CORP | Chicago | — | ◇ UNVERIFIED |
| AEAbility Engineering | South Holland | — | ◇ UNVERIFIED |
| AMAccent Metal Finishing INC | Schiller Park | — | ◇ UNVERIFIED |
| AUAcco USA INC | Wheeling | — | ◇ UNVERIFIED |
| APAccurate Partitions CORP | Mccook | — | ◇ UNVERIFIED |
| ASAcme Screw Company | Wheaton | — | ◇ UNVERIFIED |
| ARAction Rack & Mfg CO | Chicago | — | ◇ UNVERIFIED |
| ACAdjustable Clamp CO | Chicago | — | ◇ UNVERIFIED |
 Advanced Drainage Systems | Mendota | — | ◇ UNVERIFIED |
| AGAdvanced Galvanics INC | Bensenville | — | ◇ UNVERIFIED |
| AAAdvantage Autobody | Hampton | — | ◇ UNVERIFIED |
| APAero Plating Works | Chicago | — | ◇ UNVERIFIED |
| AMAlabama Metal Industries CORP | Bourbonnais | — | ◇ UNVERIFIED |
| ABAl Bar-wilmette Platers | Wilmette | — | ◇ UNVERIFIED |
| AIAlchemitron INC | Elgin | — | ◇ UNVERIFIED |
| ALAlfa Laval Inc-standard Refrigeration | Wood Dale | — | ◇ UNVERIFIED |
| AHAllied Hastings Barrel Drum Service | Chicago | — | ◇ UNVERIFIED |
| AMAll Metals Recycling | Franklin Park | — | ◇ UNVERIFIED |
| AIAlloyweld Inspection | Bensenville | — | ◇ UNVERIFIED |
| ASAll Spun Metal Products | Des Plaines | — | ◇ UNVERIFIED |
| AIAltrachem INC | Joliet | — | ◇ UNVERIFIED |
| APAmax Plating Incorporated | Elgin | — | ◇ UNVERIFIED |
| AEAmber Engineering & Mfg CO | Elk Grove Village | — | ◇ UNVERIFIED |
| APAmber Plating Works INC | Chicago | — | ◇ UNVERIFIED |
| ABAmerican Building Products | Salem | — | ◇ UNVERIFIED |
| ACAmerican/jebco CORP | Franklin Park | — | ◇ UNVERIFIED |
| ALAmerican Lock CO | Crete | — | ◇ UNVERIFIED |
| AMAmerican Metal Fibers, Incorporated | Lake Bluff | — | ◇ UNVERIFIED |
| AMAmerican Midwest Chrome Plating & Polishing | Chicago | — | ◇ UNVERIFIED |
| ANAmerican Nameplate CO | Chicago | — | ◇ UNVERIFIED |
| ARAmerican Rack CO | Chicago | — | ◇ UNVERIFIED |
| ACAmerock CORP | Rockford | — | ◇ UNVERIFIED |
| ADAmilan Distributors INC | Bensenville | — | ◇ UNVERIFIED |
| ACAnchor Coupling CO | Dixon | — | ◇ UNVERIFIED |
| AFAnderson Fittings | Oak Forest | — | ◇ UNVERIFIED |
| ADApco Deburring & Polishing INC | Chicago | — | ◇ UNVERIFIED |
| ASArcher Screw Products | Franklin Park | — | ◇ UNVERIFIED |
| ASArchitectural Specialty Products INC | Chicago | — | ◇ UNVERIFIED |
| ADArea Diesel Service INC | Carlinville | — | ◇ UNVERIFIED |
