| ASAb Specialty Silicones | Waukegan | — | ◇ UNVERIFIED |
| ACAccel Color INC | Naperville | — | ◇ UNVERIFIED |
| APAce Plating CO | Chicago | — | ◇ UNVERIFIED |
| AIActavis INC | Gurnee | — | ◇ UNVERIFIED |
| ABActive Biomaterials LLC | Elk Grove Village | — | ◇ UNVERIFIED |
| ACAdheron Coatings CORP | Oak Forest | — | ◇ UNVERIFIED |
| ASAdhesive Systems INC | Frankfort | — | ◇ UNVERIFIED |
| ADAdm Development Products | Decatur | — | ◇ UNVERIFIED |
| AKAens Kankakee Plt | Kankakee | — | ◇ UNVERIFIED |
| ACAeropres Corporation | Manhattan | — | ◇ UNVERIFIED |
| ACAeropress CORP | Manhattan | — | ◇ UNVERIFIED |
| AFAgripride Fs INC | Breese | — | ◇ UNVERIFIED |
| AUAgrium US INC | Marseilles | — | ◇ UNVERIFIED |
| ARAirgas Roxana - Woodriver, Il Co2 Plant | Roxana | — | ◇ UNVERIFIED |
| AUAirgas USA LLC | Chicago | — | ◇ UNVERIFIED |
| APAir Products & Chemicals INC | Joliet | — | ◇ UNVERIFIED |
| APAir Products Manufacturing CORP. | Granite City | — | ◇ UNVERIFIED |
| ADAj Daw Printing Ink CO | Countryside | — | ◇ UNVERIFIED |
| ANAkzo Nobel Surface Chemistry LLC | Mccook | — | ◇ UNVERIFIED |
| ACAlberto Culver | Melrose Park | — | ◇ UNVERIFIED |
| AEAlgonquian Ethanol LLC | Princeton | — | ◇ UNVERIFIED |
| ASAllerton Supply Company INC. (fairmont) | Fairmount | — | ◇ UNVERIFIED |
| AEAlternative Energy Sources INC | Greenville | — | ◇ UNVERIFIED |
| AAAmcor American Metal Chem CORP | Chicago | — | ◇ UNVERIFIED |
| ABAmerican Blending and Filling | Waukegan | — | ◇ UNVERIFIED |
| ABAmerican Blending and Filling | Waukegan | — | ◇ UNVERIFIED |
| AIAmerichem INC | Elgin | — | ◇ UNVERIFIED |
| ACAmericoats Coatings International INC | Franklin Park | — | ◇ UNVERIFIED |
| AIAmericoats-coatings International INC | Franklin Park | — | ◇ UNVERIFIED |
| AAndersonbrecon | Rockford | — | ◇ UNVERIFIED |
| AGArcar Graphics LLC | West Chicago | — | ◇ UNVERIFIED |
| ACArch Chemicals Specialty Products, INC. | Seward | — | ◇ UNVERIFIED |
| ABArgo Biodiesel Plant | Argo | — | ◇ UNVERIFIED |
| AIArkema INC | Lemont | — | ◇ UNVERIFIED |
| ARAventine Renewable Energy | Canton | — | ◇ UNVERIFIED |
| ACAxalta Coating Systems LLC | Morton Grove | — | ◇ UNVERIFIED |
| BCB-b Chemical CORP | La Grange | — | ◇ UNVERIFIED |
| BIBellwood Industrial LLC (former Universal Bldg Products Property) | Bellwood | — | ◇ UNVERIFIED |
| BRBelt Railway CO of Chicago | Bedford Park | — | ◇ UNVERIFIED |
| BFBiovantage Fuels LLC | Belvidere | — | ◇ UNVERIFIED |
| BGBoc Gases | Romeoville | — | ◇ UNVERIFIED |
| BCBorden Chemical Forest Park Plant | Forest Park | — | ◇ UNVERIFIED |
| BMBrady Mccasland INC | East Saint Louis | — | ◇ UNVERIFIED |
| BMBrenntag Mid South INC | East St Louis | — | ◇ UNVERIFIED |
| BLBridgeport Landings LLC | Chicago | — | ◇ UNVERIFIED |
| CICabery, Il | Cabery | — | ◇ UNVERIFIED |
| CMCabot Microelectronics CORP | Aurora | — | ◇ UNVERIFIED |
| CGCameron Great Lakes | Batavia | — | ◇ UNVERIFIED |
| CCCandy & CO | Chicago | — | ◇ UNVERIFIED |
| CCCandy & CO | Chicago | — | ◇ UNVERIFIED |
