| SBSouthern Block Company | Warsaw | NC | — | ◇ UNVERIFIED |
| SCSouthern Concrete Construction Company, INC. | Norman Park | GA | — | ◇ UNVERIFIED |
| SCSouthern Concrete Materials, INC Dba Charlotte Blo | Charlotte | NC | — | ◇ UNVERIFIED |
| SCSouthern Crushed Concrete, LLC | Corpus Christi | TX | — | ◇ UNVERIFIED |
| SHSouthern Heritage Masonry, LLC | Atlanta | GA | — | ◇ UNVERIFIED |
| SMSouthern Meter Box, INC. | Alexandria | LA | — | ◇ UNVERIFIED |
| SPSouthern Precast Concrete Corporation | Tarpon Springs | FL | — | ◇ UNVERIFIED |
| SPSouthern Products | Sardis | MS | — | ◇ UNVERIFIED |
| SUSouthern Utah Vault Co., INC. | Washington | UT | — | ◇ UNVERIFIED |
| SVSouthern Vermont Precast, INC. | Westminster | VT | — | ◇ UNVERIFIED |
| SPSouthwestern Packaging & Seals | Shreveport | LA | — | ◇ UNVERIFIED |
| SSpancrete | Newnan | GA | — | ◇ UNVERIFIED |
| SISpancrete Industries, INC. | Menomonee Falls | WI | — | ◇ UNVERIFIED |
| SISpancrete Industries - Valders | Valders | WI | — | ◇ UNVERIFIED |
| SISpancrete Industries - Waukesha | Waukesha | WI | — | ◇ UNVERIFIED |
| SOSpancrete of Illinois | Crystal Lake | IL | — | ◇ UNVERIFIED |
| SWSpeedling Welding Trailer Dba Svj Creative Designs | Kellogg | MN | — | ◇ UNVERIFIED |
| SCSpeer Concrete, INC. | Carthage | NC | — | ◇ UNVERIFIED |
| SESperos Enterprises, INC. | Phoenix | AZ | — | ◇ UNVERIFIED |
| SCSpray Com Utilities Inc.* | Knob Noster | MO | — | ◇ UNVERIFIED |
| SCSpringfield Concrete Block & Brick, INC. | Springfield | OH | — | ◇ UNVERIFIED |
| SCSpringfield Concrete Recycling LLC | Springfield | IL | — | ◇ UNVERIFIED |
| SCSR Concrete Resurfacing, Inc. | Luthersburg | PA | — | ◇ UNVERIFIED |
| SCSrm Concrete, Llc, Concrete Block Plant #911 | Saint Paris | OH | — | ◇ UNVERIFIED |
| SPSrm Plant 14120 Blue Wing | San Antonio | TX | — | ◇ UNVERIFIED |
| SSS & S Precast, INC. | Bonita Springs | FL | — | ◇ UNVERIFIED |
| STSss Transport INC. | Hayward | CA | — | ◇ UNVERIFIED |
| SPSsw Premier, LLC | Portland | TN | — | ◇ UNVERIFIED |
| SAStaco Architectural Roof Tile | Phoenix | AZ | — | ◇ UNVERIFIED |
| SSStaffing Services, INC. | Lincoln | NE | — | ◇ UNVERIFIED |
| SSStafford Stone Works, LLC. | Fredericksburg | VA | — | ◇ UNVERIFIED |
| SBStandard Block Company, Inc. | Newnan | GA | — | ◇ UNVERIFIED |
| SPStandard Precast, INC. | Jacksonville | FL | — | ◇ UNVERIFIED |
| SSStandard Sand & Silica Company | Lake Wales | FL | — | ◇ UNVERIFIED |
| SSStandard Supply CO | Maysville | KY | — | ◇ UNVERIFIED |
| SCState Crushing, INC. | Auburn Hills | MI | — | ◇ UNVERIFIED |
| SCState Crushing, Inc.-east | Warren | MI | — | ◇ UNVERIFIED |
| SRState Road Cement Block | Dartmouth | MA | — | ◇ UNVERIFIED |
| SMStavola Materials Oldwick Quarry | Oldwick | NJ | — | ◇ UNVERIFIED |
| SIStepstone, INC. | Los Angeles | CA | — | ◇ UNVERIFIED |
| SWSterling Wilbert Vault CO | Sterling | IL | — | ◇ UNVERIFIED |
| SHSt. Henry Tile Co., INC. | Greenville | OH | — | ◇ UNVERIFIED |
| SPSti Precast | Leominster | MA | — | ◇ UNVERIFIED |
| SJSt. Joe Concrete Products | Elwood | KS | — | ◇ UNVERIFIED |
| SJSt. Johns Precast, INC. | Saint Augustine | FL | — | ◇ UNVERIFIED |
| SLSt Louis Flexicore INC | East Saint Louis | IL | — | ◇ UNVERIFIED |
| SSStockman Stoneworks* | Jefferson City | MO | — | ◇ UNVERIFIED |
| SCStone Cast, INC. | Houston | TX | — | ◇ UNVERIFIED |
| SDStonemark Designs, Inc. | Huntsville | TX | — | ◇ UNVERIFIED |
| SSStone Specialties, INC. | Lakeland | FL | — | ◇ UNVERIFIED |
