| ADAir Duct Manufacturing, INC. | Addison | — | ◇ UNVERIFIED |
| AMAlin Machining Company, INC. | Melrose Park | — | ◇ UNVERIFIED |
| AMAll Metal Solutions, INC | Chicago | — | ◇ UNVERIFIED |
| APAlstom Power | Danville | — | ◇ UNVERIFIED |
| ABAmbassador Bridge & Paving Supply LLC | Bourbonnais | — | ◇ UNVERIFIED |
| AMAmber Mechanical Contractors, INC. | Streamwood | — | ◇ UNVERIFIED |
| ASAmerican Shaft CO | Rockford | — | ◇ UNVERIFIED |
| AIAmiberica, INC | Chicago | — | ◇ UNVERIFIED |
| ASAnderson Snow Acquisition LLC | Schiller Park | — | ◇ UNVERIFIED |
| AAndritz | Rockton | — | ◇ UNVERIFIED |
| AAnsimag | Bloomingdale | — | ◇ UNVERIFIED |
| AUAramark Uniform Services | Metropolis | — | ◇ UNVERIFIED |
| AIArc Industries, INC. | Schaumburg | — | ◇ UNVERIFIED |
| ASArctic Snow & Ice Products | Bradley | — | ◇ UNVERIFIED |
| ACArizon Companies | Peoria | — | ◇ UNVERIFIED |
| AArpac | Schiller Park | — | ◇ UNVERIFIED |
| APArrem Plastics INC. | Addison | — | ◇ UNVERIFIED |
| AEAteco Engine & Dyno Shop Il INC | Ingleside | — | ◇ UNVERIFIED |
| ADAtlas Die, LLC | Glendale Heights | — | ◇ UNVERIFIED |
| ASAts Services LLC | Peoria | — | ◇ UNVERIFIED |
| BBBarak Business Services INC. | Bensenville | — | ◇ UNVERIFIED |
| BCBarnant CO | Barrington | — | ◇ UNVERIFIED |
| BHBell & Howell Business Equipment | Lincolnwood | — | ◇ UNVERIFIED |
| BABellota Agrisolutions and Tools Usa, LLC | Milan | — | ◇ UNVERIFIED |
| BMBenda Manufacturing INC. | Tinley Park | — | ◇ UNVERIFIED |
| BABernard- a Division of Miller Electric Manufacturing Company Welding | Beecher | — | ◇ UNVERIFIED |
| BSBettendorf Stanford Holdings, INC. | Salem | — | ◇ UNVERIFIED |
| BGBison Gear & Engineering Corporation | Saint Charles | — | ◇ UNVERIFIED |
| BIBlackhawk Industrial Distribution, INC. | Carol Stream | — | ◇ UNVERIFIED |
| BTBrohn Tech LLC | Ursa | — | ◇ UNVERIFIED |
| BLBukowina LLC | Bensenville | — | ◇ UNVERIFIED |
| CUCamfil Usa, INC. | Crystal Lake | — | ◇ UNVERIFIED |
| CICarbi-grind, Incorporated | Vernon Hills | — | ◇ UNVERIFIED |
| CMCardinal Mfg | Mount Vernon | — | ◇ UNVERIFIED |
| CNCase New Holland INC. | Goodfield | — | ◇ UNVERIFIED |
| CCaterpillar | Montgomery | — | ◇ UNVERIFIED |
| CECaterpillar Engine Systems, INC. | Pontiac | — | ◇ UNVERIFIED |
| CGCaterpillar Global Mining LLC | Carrier Mills | — | ◇ UNVERIFIED |
| CICaterpillar INC | Edwards | — | ◇ UNVERIFIED |
| CICaterpillar INC | East Peoria | — | ◇ UNVERIFIED |
| CICaterpillar INC. | Mossville | — | ◇ UNVERIFIED |
| CICaterpillar, INC. | East Peoria | — | ◇ UNVERIFIED |
| CICaterpillar INC - Mossville | Mossville | — | ◇ UNVERIFIED |
| CCC. Cretors & Company | Wood Dale | — | ◇ UNVERIFIED |
| CICentral Illinois Mfg CO | Bement | — | ◇ UNVERIFIED |
| CWChenoa Welding & Fabrication, INC. | Chenoa | — | ◇ UNVERIFIED |
| CMChicago Measurement, L.L.C. | Mchenry | — | ◇ UNVERIFIED |
| CMChicago Metallic CORP | Forest View | — | ◇ UNVERIFIED |
| CSChurch Street Pumping Station | Bensenville | — | ◇ UNVERIFIED |
| CKCjt Koolcarb, INC. | Carol Stream | — | ◇ UNVERIFIED |
