| SOSpancrete of Illinois | Crystal Lake | — | ◇ UNVERIFIED |
| SRSport Redi-mix LLC | Champaign | — | ◇ UNVERIFIED |
| SIStaleys Interstate Ready-mix Concrete | Peoria | — | ◇ UNVERIFIED |
| SSStark Services INC | Marengo | — | ◇ UNVERIFIED |
| SMSt Marys Cement INC | Waukegan | — | ◇ UNVERIFIED |
| SMSt Marys Cement INC - Dixon Plant | Dixon | — | ◇ UNVERIFIED |
| SLStonecasters LLC | Wauconda | — | ◇ UNVERIFIED |
| SMStrategic Materials INC | Chicago | — | ◇ UNVERIFIED |
| SMStrategic Materials INC | Chicago | — | ◇ UNVERIFIED |
| SGSuperior Graphite CO | Bedford Park | — | ◇ UNVERIFIED |
| SMSuper Mix Concrete LLC | Volo | — | ◇ UNVERIFIED |
| SMSuper Mix INC | Marengo | — | ◇ UNVERIFIED |
| SBSwansea Building Products CORP | East Saint Louis | — | ◇ UNVERIFIED |
| SCSzentes Concrete | Peoria | — | ◇ UNVERIFIED |
| TGTemperbent Glass LP | Alsip | — | ◇ UNVERIFIED |
| TMTerrell Materials CORP | Des Plaines | — | ◇ UNVERIFIED |
| TMTerrell Materials CORP | Rosemont | — | ◇ UNVERIFIED |
| TDTh Davidson & CO INC | Kankakee | — | ◇ UNVERIFIED |
| TAThe Andersons Lincoln Cob Products | Lincoln | — | ◇ UNVERIFIED |
| TSThelen Sand & Gravel INC | Holiday Hills | — | ◇ UNVERIFIED |
| TSThelen Sand & Gravel INC | Libertyville | — | ◇ UNVERIFIED |
| TCThermal Ceramics INC | Girard | — | ◇ UNVERIFIED |
| THTison & Hall Concrete Prod INC | Harrisburg | — | ◇ UNVERIFIED |
| TITrenwyth Industries | South Beloit | — | ◇ UNVERIFIED |
| TITrenwyth Industries | South Beloit | — | ◇ UNVERIFIED |
| TRTri-co. Redi Mix CORP. | Carpentersville | — | ◇ UNVERIFIED |
| TRTri-county Ready Mix INC | Arthur | — | ◇ UNVERIFIED |
| UCUnited Concrete CORP | Waukegan | — | ◇ UNVERIFIED |
| UCUnited Contractors Midwest | Chapin | — | ◇ UNVERIFIED |
| URUnited Ready Mix INC | Pekin | — | ◇ UNVERIFIED |
| UAUniversal Abrasives INC | Carol Stream | — | ◇ UNVERIFIED |
| URUpchurch Ready Mix Concrete CO | East Saint Louis | — | ◇ UNVERIFIED |
| URUpchurch Ready Mix Concrete CO INC | Belleville | — | ◇ UNVERIFIED |
| URUrbana Recycling CO | Urbana | — | ◇ UNVERIFIED |
| UDUS Diamond Wheel INC | Oswego | — | ◇ UNVERIFIED |
| UCUsg CORP Research Center | Libertyville | — | ◇ UNVERIFIED |
| UMUS Minerals | Coffeen | — | ◇ UNVERIFIED |
| UMUS Minerals INC | Baldwin | — | ◇ UNVERIFIED |
| VMVans Material CO INC | Midlothian | — | ◇ UNVERIFIED |
| VPVcna Prairie Illinois Building Materials LLC | Aurora | — | ◇ UNVERIFIED |
| VPVcna Prairie Illinois Building Materials LLC Yard 1007 | Chicago | — | ◇ UNVERIFIED |
| VPVcna Prairie Illinois Building Materials LLC Yard 1140 | Blue Island | — | ◇ UNVERIFIED |
| VPVcna Prairie Illinois Illinois INC Yard 1134 | Romeoville | — | ◇ UNVERIFIED |
| VPVcna Prairie Illinois INC | Monee | — | ◇ UNVERIFIED |
| VPVcna Prairie Illinois INC | Manteno | — | ◇ UNVERIFIED |
| VPVcna Prairie Illinois INC | Fox Lake | — | ◇ UNVERIFIED |
| VPVcna Prairie Illinois INC | Channahon | — | ◇ UNVERIFIED |
| VPVcna Prairie Illinois INC | Lemont | — | ◇ 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 |
