 Welch Bros., INC. | Elgin | 100–499 | ● ACTIVE |
 Cat-i Manufacturing INC. | South Elgin | — | ● ACTIVE |
| WPWeber-stephen Products LLC | Huntley | 100–499 | ◐ LIKELY ACTIVE |
| OROzinga Ready Mix Concrete INC | South Elgin | — | ◐ LIKELY ACTIVE |
| OIOzinga Illinois Rmc INC | Montgomery | — | ◇ UNVERIFIED |
| VPVcna Prairie Illinois Building Materials LLC Yard 1019 | East Dundee | — | ◇ UNVERIFIED |
| VPVcna Prairie INC - Yard 1135 | Batavia | — | ◇ UNVERIFIED |
| CACatalyst Acoustics Group Mw | North Aurora | 100–499 | ◐ LIKELY ACTIVE |
| CQCHI Quikrete | Elburn | 20–99 | ◐ LIKELY ACTIVE |
| DPDukane Precast - Aurora Plant | Aurora | 100–499 | ◐ LIKELY ACTIVE |
| UCUnilock Chicago | Aurora | 100–499 | ◐ LIKELY ACTIVE |
| APAtmi Precast | Aurora | — | ◇ UNVERIFIED |
| ECElmhurst Chicago Stone | Elgin | — | ◇ UNVERIFIED |
| HIHaeger Industries INC | East Dundee | — | ◇ UNVERIFIED |
| KCK-five Construction INC | North Aurora | — | ◇ UNVERIFIED |
| MMMeyer Material CO | Huntley | — | ◇ UNVERIFIED |
| NBNorthfield Block Company | Elgin | — | ◇ UNVERIFIED |
| OCOzinga Concrete Products - Hampshire | Hampshire | — | ◇ UNVERIFIED |
| OROzinga Ready Mix Concrete INC | Aurora | — | ◇ UNVERIFIED |
| PCPlote Construction | North Aurora | — | ◇ UNVERIFIED |
| PCPlote Construction INC | East Dundee | — | ◇ UNVERIFIED |
| PRPoint Ready Mix LLC | Hampshire | — | ◇ UNVERIFIED |
| PMPrairie Materials Sales-plant 10 | Batavia | — | ◇ UNVERIFIED |
| QCQuikrete - Chicago, Il Plant | Elburn | — | ◇ UNVERIFIED |
| SASelee Advanced Ceramics | Gilberts | — | ◇ UNVERIFIED |
| TRTri-co. Redi Mix CORP. | Carpentersville | — | ◇ UNVERIFIED |
| VPVcna Prairie Illinois INC Batavia Ready Mix LLC Yard 1132 | Montgomery | — | ◇ UNVERIFIED |
| VPVcna Prairie Illinois INC Batavia Ready Mix LLC Yard 1136 | Elburn | — | ◇ UNVERIFIED |
 Abrasive Technology - Elgin | Elgin | 20–99 | ◐ LIKELY ACTIVE |
| CChicago | Elgin | 20–99 | ◐ LIKELY ACTIVE |
| INIL North Suburban General - 703 | Elgin | 20–99 | ◐ LIKELY ACTIVE |
| MPMontgomery Plant - 255 | Montgomery | 20–99 | ◐ LIKELY ACTIVE |
| SCSEK Corporation / Aurora | Aurora | 1–19 | ◐ LIKELY ACTIVE |
| SCSEK Corporation/MAIN | Aurora | 1–19 | ◐ LIKELY ACTIVE |
| SCSEK Corporation / Radatz | S Elgin | 1–19 | ◐ LIKELY ACTIVE |
| SESouth Elgin Yard 287 | Elgin | 20–99 | ◐ LIKELY ACTIVE |
| CBConcrete & Block CO | Aurora | — | ◇ UNVERIFIED |
| GEGayton Enterprises | Saint Charles | — | ◇ UNVERIFIED |
| GGGeneva Glass Works, INC. | Geneva | — | ◇ UNVERIFIED |
| MMMeyer Material CO | Saint Charles | — | ◇ UNVERIFIED |
| MMMeyer Material CO - Elgin Yard 41 | Elgin | — | ◇ UNVERIFIED |
| PCPlote Construction INC | Huntley | — | ◇ UNVERIFIED |
| PIPmautomotive, INC. | Batavia | — | ◇ UNVERIFIED |
| QQuikrete-chicago | Elburn | — | ◇ UNVERIFIED |
| RPRefractory Products CO | Elgin | — | ◇ UNVERIFIED |
| SMSuper Mix INC | Saint Charles | — | ◇ UNVERIFIED |
| SSSurface Solutions, INC. | Saint Charles | — | ◇ UNVERIFIED |
| TGThe Granite & Marble Depot, INC. | Aurora | — | ◇ UNVERIFIED |
| WCWindmill Countertops | Batavia | — | ◇ UNVERIFIED |
