| RPR.e. Pierson Materials Vineland Concrete | Vineland | NJ | — | ◐ LIKELY ACTIVE |
| RLRepi LLC | Dallas | NC | 20–99 | ◐ LIKELY ACTIVE |
| RSRes Specialty Pyrotechnics, INC. | Belle Plaine | MN | — | ◐ LIKELY ACTIVE |
Richards-wilbert INC - Roanoke Valley | Salem | VA | — | ◐ LIKELY ACTIVE |
| RMRinker Materials Concrete Pipe Division | Whitestown | IN | — | ◐ LIKELY ACTIVE |
| RMRinker Materials - Grand Junction | Grand Junction | CO | — | ◐ LIKELY ACTIVE |
| RCRiver City Concrete, INC. - Savannah | Savannah | TN | — | ◐ LIKELY ACTIVE |
| RCRiverside Const Materials/bristol Twp | Bristol | PA | — | ◐ LIKELY ACTIVE |
| RCRmc Carolina Materials Incorporated | Stokesdale | NC | — | ◐ LIKELY ACTIVE |
| RBRoanoke Block - Plant 716 | Roanoke | VA | — | ◐ LIKELY ACTIVE |
| 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 |
| RTRonald T Dodge Company | Dayton | OH | — | ◐ LIKELY ACTIVE |
| RRRost Ready Mix | Marshfield | MO | 20–99 | ◐ LIKELY ACTIVE |
| RDRousselot Dubuque INC. | Dubuque | IA | 20–99 | ◐ LIKELY ACTIVE |
| RSRoyal Stone LLC | Williamston | MI | 20–99 | ◐ 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 |
| SJSan Joaquin Chemicals, INC. | Fresno | CA | — | ◐ LIKELY ACTIVE |
| SFSanta Fe Fee H Tb Swdw #12 Facility | Marksville | LA | — | ◐ LIKELY ACTIVE |
| SRSantee Redi Mix | Moncks Corner | SC | — | ◐ LIKELY ACTIVE |
| SCSasco Chemical Group, LLC - Monroe | Albany | GA | 1–19 | ◐ 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 |
| SPSealy Plant | Sealy | TX | 20–99 | ◐ LIKELY ACTIVE |
| SISeapac INC | Mobile | AL | — | ◐ LIKELY ACTIVE |
| SSSecurity Signals INC | Oakland | TN | — | ◐ LIKELY ACTIVE |
| SCSelect Chemistry - Evans Distribution Facility | Evans | CO | — | ◐ LIKELY ACTIVE |
| SOSemo Operating Company | Bragg City | MO | — | ◐ LIKELY ACTIVE |
| SOSemo Operating Company | Cape Girardeau | MO | — | ◐ LIKELY ACTIVE |