 Smith & Richardson Manufacturing CO | Geneva | 20–99 | ● ACTIVE |
| CCCynamic Chemical Company | Batavia | 20–99 | ● ACTIVE |
 3d Resin Solutions, LLC | South Elgin | — | ● ACTIVE |
 Accurate Color and Compounding, INC. | Aurora | — | ● ACTIVE |
 Americo Chemical Products, LLC | Elgin | — | ● ACTIVE |
 Clarke Mosquito Control Products, INC. | Saint Charles | — | ● ACTIVE |
 Environmental Leverage INC | North Aurora | — | ● ACTIVE |
| FLFinish Line USA INC. | Elgin | — | ● ACTIVE |
 Global Packaging Development LLC | Batavia | — | ● ACTIVE |
 Incon Industries, INC. | Saint Charles | — | ● ACTIVE |
 Laboratory Technologies INC | Elburn | — | ● ACTIVE |
| OSOnly Skullz LLC | Aurora | — | ● ACTIVE |
| ULUnited Laboratories INC | Saint Charles | — | ● ACTIVE |
 Vanco Packaging CORP | Aurora | — | ● ACTIVE |
 Hentzen Coatings INC | Batavia | 20–99 | ◐ LIKELY ACTIVE |
| ULUnited Laboratories INC | Saint Charles | 100–499 | ◐ LIKELY ACTIVE |
| VIVarn International INC - a Flint Group CO | Batavia | 1–19 | ◐ LIKELY ACTIVE |
| SCSika CORP | Aurora | — | ◐ LIKELY ACTIVE |
 Sun Chemical CORP | Saint Charles | — | ◐ LIKELY ACTIVE |
| VIVvf Illinois Services LLC | Montgomery | 100–499 | ◐ LIKELY ACTIVE |
| FUFinishes Unlimited INC | Sugar Grove | — | ◇ UNVERIFIED |
| HSHenkel Surface Technologies | Aurora | — | ◇ UNVERIFIED |
 Rochester Midland CORP | Montgomery | — | ◇ UNVERIFIED |
| SWShaped Wire INC | Batavia | — | ◇ UNVERIFIED |
| TDTiger Drylac USA INC | Saint Charles | — | ◇ UNVERIFIED |
| ECEastman Carpentersville Plant | Carpentersville | — | ◐ LIKELY ACTIVE |
| PCPolynt Composites USA INC. | Carpentersville | — | ▲ REPORTED CLOSED |
| TBTPM Batavia | Batavia | 20–99 | ◐ LIKELY ACTIVE |
| UCUniversal Chemicals and Coatings, INC. | Elgin | — | ◐ LIKELY ACTIVE |
| FPFirst Priority INC | Elgin | — | ◐ LIKELY ACTIVE |
| HSHexion Specialty Chemicals, INC. | Carpentersville | — | ◐ LIKELY ACTIVE |
| 1A1st Ayd Corporation | Elgin | — | ◇ UNVERIFIED |
| APAmerican Powder Coating INC | Saint Charles | — | ◇ UNVERIFIED |
| AIAmerichem INC | Elgin | — | ◇ UNVERIFIED |
| BLBiologos LLC | Montgomery | — | ◇ UNVERIFIED |
| CGCameron Great Lakes | Batavia | — | ◇ UNVERIFIED |
| DDDsm Desotech INC | Elgin | — | ◇ UNVERIFIED |
| HIHa International LLC | Aurora | — | ◇ UNVERIFIED |
| HAHenkel Adhesives Corporation | Elgin | — | ◇ UNVERIFIED |
| IPI Pulloma Paints/james B Day & CO | Carpentersville | — | ◇ UNVERIFIED |
| KCKolorcure CORP | Batavia | — | ◇ UNVERIFIED |
| PIPpg INC Architectural Coatings | Aurora | — | ◇ UNVERIFIED |
| PIPpg Industries | Batavia | — | ◇ UNVERIFIED |
| PIProell INC | Saint Charles | — | ◇ UNVERIFIED |
 Radco Industries INC | La Fox | — | ◇ UNVERIFIED |
| RVRiver Valley Coatings INC | Aurora | — | ◇ UNVERIFIED |
| SCSuncast CORP | Batavia | — | ◇ UNVERIFIED |
| SPSunstar Pharmaceutical INC | Elgin | — | ◇ UNVERIFIED |
| USUv Specialties LLC | Saint Charles | — | ◇ UNVERIFIED |
| 1A1st Ayd Building | Elgin | 100–499 | ◐ LIKELY ACTIVE |
