| RCRoanoke Cement Company | Winston Salem | NC | — | ◐ LIKELY ACTIVE |
| RRRobertson Ready Mix | Winfield | AL | — | ◐ LIKELY ACTIVE |
| RARockingham Asphalt INC - Harrisonburg | Harrisonburg | VA | — | ◐ LIKELY ACTIVE |
| RRRockingham Redi-mix - Blacksburg Facility | Blacksburg | VA | — | ◐ LIKELY ACTIVE |
| RRRockingham Redi-mix - Boyd Tavern Facility | Troy | VA | — | ◐ LIKELY ACTIVE |
| RRRockingham Redi-mix - Charlottesville Facility | Charlottesville | VA | — | ◐ LIKELY ACTIVE |
| RRRockingham Redi-mix - Fishersville Facility | Waynesboro | VA | — | ◐ LIKELY ACTIVE |
| RRRockingham Redi-mix - Garbers Church Facility | Harrisonburg | VA | — | ◐ LIKELY ACTIVE |
| RRRockingham Redi-mix - Lexington Facility | Lexington | VA | — | ◐ LIKELY ACTIVE |
| RRRockingham Redi-mix - Pulaski Facility | Pulaski | VA | — | ◐ LIKELY ACTIVE |
| RMRocky Mountain Ready Mix Concrete, Incorporated | Brighton | CO | — | ◐ LIKELY ACTIVE |
| RMRocky Mount Ready Mix Concrete INC | Rocky Mount | VA | — | ◐ LIKELY ACTIVE |
| RCRocla Concrete Tie Inc-Pueblo | Pueblo | CO | 20–99 | ◐ LIKELY ACTIVE |
| RLRoofblok Limited | Gardner | MA | — | ◐ LIKELY ACTIVE |
| RRRost Ready Mix | Marshfield | MO | 20–99 | ◐ LIKELY ACTIVE |
| RSRoyal Stone LLC | Williamston | MI | 20–99 | ◐ LIKELY ACTIVE |
| RSRp Smith & Son INC | Succasunna | NJ | — | ◐ LIKELY ACTIVE |
| RBRw Busse Excavating | Grand Lake | CO | — | ◐ LIKELY ACTIVE |
| SDSaltillo Division of B and B Concrete Company INC | Saltillo | MS | — | ◐ LIKELY ACTIVE |
| SBSan Bernardino Plant 12 | San Bernardino | CA | 1–19 | ◐ LIKELY ACTIVE |
| SFSanta Fe Fee H Tb Swdw #12 Facility | Marksville | LA | — | ◐ LIKELY ACTIVE |
| SRSantee Redi Mix | Moncks Corner | SC | — | ◐ LIKELY ACTIVE |
| SBS B Cox Concrete | Sandston | VA | — | ◐ LIKELY ACTIVE |
| SBS B Cox Ready Mix INC - Chesapeake Plant | Chesapeake | VA | — | ◐ LIKELY ACTIVE |
| SBS B Cox Ready Mix INC - Goochland Plant | Rockville | VA | — | ◐ LIKELY ACTIVE |
| SBS B Cox Ready Mix-nottoway Plant | Blackstone | VA | — | ◐ LIKELY ACTIVE |
| SCSchreiter Concrete | Wright City | MO | — | ◐ LIKELY ACTIVE |
| SCSchreiter Concrete CO. | Wright City | MO | 20–99 | ◐ LIKELY ACTIVE |
| SCSchuster Concrete Ready Mix - Cp18 | Alexandria | VA | — | ◐ LIKELY ACTIVE |
| SCSchuster Concrete Ready Mix - Kalahari | Woodford | VA | — | ◐ LIKELY ACTIVE |
| SCScranton Craftsmen Incorporated | Throop | PA | 20–99 | ◐ LIKELY ACTIVE |
| SCScruggs Concrete Company | Madison | FL | — | ◐ LIKELY ACTIVE |
| SIScurlock Industries of Springfield-springfiled | Springfield | MO | — | ◐ LIKELY ACTIVE |
| SPSealy Plant | Sealy | TX | 20–99 | ◐ LIKELY ACTIVE |
| SOSemo Operating Company | Cape Girardeau | MO | — | ◐ LIKELY ACTIVE |
| SOSemo Operating Company | Bragg City | MO | — | ◐ LIKELY ACTIVE |
| SRSemo Ready Mix | Sikeston | MO | — | ◐ LIKELY ACTIVE |
| SRSemo Ready Mix | Marston | MO | — | ◐ LIKELY ACTIVE |
| SRSemo Ready Mix, INC. | Cape Girardeau | MO | — | ◐ LIKELY ACTIVE |
| SBSeptember Bloom Ready Mix Concrete Plant | Mcminnville | TN | — | ◐ LIKELY ACTIVE |
| SCSequatchie Concrete Service | Chattanooga | TN | — | ◐ LIKELY ACTIVE |
| SCSequatchie Concrete Service | Columbia | TN | — | ◐ LIKELY ACTIVE |
| SRSe Ready Mix - Okeechobee Commerce Park | Okeechobee | FL | — | ◐ LIKELY ACTIVE |
| SBSessler Building Materials Inc dba Barnes & Cone | Syracuse | NY | 20–99 | ◐ LIKELY ACTIVE |
| SQSFO Quikrete | Fremont | CA | 20–99 | ◐ LIKELY ACTIVE |
| SQSGF Quikrete | Springfield | MO | 1–19 | ◐ LIKELY ACTIVE |
| SMShelly Materials, Inc. - Medina Supply Company | Medina | OH | 20–99 | ◐ LIKELY ACTIVE |
Sherman Industries LLC Gardendale Plant | Birmingham | AL | — | ◐ LIKELY ACTIVE |
Sherman Industries LLC Sylacauga | Sylacauga | AL | — | ◐ LIKELY ACTIVE |
Sherman Industries - Trussville Plant | Trussville | AL | — | ◐ LIKELY ACTIVE |