| SCSgl Carbon, LLC | Saint Marys | — | ◇ UNVERIFIED |
| SBShaffer Block & Concrete Products | Somerset | — | ◇ UNVERIFIED |
| SLSilver Lake Studios | Fombell | — | ◇ UNVERIFIED |
| SCSilvi Concrete of Chester, LLC | King of Prussia | — | ◇ UNVERIFIED |
| SCSilvi Concrete of Downingtown | Downingtown | — | ◇ UNVERIFIED |
| SCSilvi Concrete of Limerick | Pottstown | — | ◇ UNVERIFIED |
| SCSilvi Concrete of Limerick | Limerick | — | ◇ UNVERIFIED |
| SCSilvi Concrete of Philadelphia | Philadelphia | — | ◇ UNVERIFIED |
| SCSja Concrete | Philadelphia | — | ◇ UNVERIFIED |
| SGS&l Glassworks INC | Fairless Hills | — | ◇ UNVERIFIED |
| SHSouth Hills Cement Contracting | Pittsburgh | — | ◇ UNVERIFIED |
| SGSpecialized Grinding Systems Dba Slicing Tech | Bangor | — | ◇ UNVERIFIED |
| SISpectrocell, INC. | Oreland | — | ◇ UNVERIFIED |
| SJSponge Jet INC | Montrose | — | ◇ UNVERIFIED |
| SCSR Concrete Resurfacing, Inc. | Luthersburg | — | ◇ UNVERIFIED |
| SGStained Glass By Pamela | Allison Park | — | ◇ UNVERIFIED |
| SGStained Glass Corner, INC. | Warrendale | — | ◇ UNVERIFIED |
| SCStandard Ceramic Supply Company | Carnegie | — | ◇ UNVERIFIED |
| SCSteel City Glass, INC. | Pittsburgh | — | ◇ UNVERIFIED |
| SCStephen Clay LLC | Philadelphia | — | ◇ UNVERIFIED |
| SHStoke Hole Pottery | Indiana | — | ◇ UNVERIFIED |
| SDSunworks Decorative Concrete LLC | Annville | — | ◇ UNVERIFIED |
| SMSusquehanna Marble and Granite, LLC | Montoursville | — | ◇ UNVERIFIED |
| TLTaktl, LLC | Glenshaw | — | ◇ UNVERIFIED |
| TCTarr Concrete & Supplies, INC. | Washington | — | ◇ UNVERIFIED |
| TITecho-bloc Incorporated | Pen Argyl | — | ◇ UNVERIFIED |
| THTerre Hill Silo Company INC | Terre Hill | — | ◇ UNVERIFIED |
| TCThe Ceramic Shop | Philadelphia | — | ◇ UNVERIFIED |
| TLThe Lane Construction Crafton | Pittsburgh, Pa | — | ◇ UNVERIFIED |
| TOTherm O Rock Inc/new Eagle Plt | New Eagle | — | ◇ UNVERIFIED |
| TWThe Window Factory | Pittsburgh | — | ◇ UNVERIFIED |
| TRThree Rivers Art Glass LLC | Saxonburg | — | ◇ UNVERIFIED |
| TSTimeless Stone Fabrication Inc. | Perkasie | — | ◇ UNVERIFIED |
| TSTitusville Supply Company | Titusville | — | ◇ UNVERIFIED |
| TFTop Floor llc | Zelienople | — | ◇ UNVERIFIED |
| TMTri-state Marble and Granite | Philadelphia | — | ◇ UNVERIFIED |
| TITrojan, INC. | Meadville | — | ◇ UNVERIFIED |
| TGTroy Granite | Pittsburgh | — | ◇ UNVERIFIED |
| TGTroy Granite INC. | Camp Hill | — | ◇ UNVERIFIED |
| UGUltimate Granite Surfaces, INC. | Gibsonia | — | ◇ UNVERIFIED |
| UBUnited Block CO. | Chicora | — | ◇ UNVERIFIED |
| USUnited States Products CO. | Pittsburgh | — | ◇ UNVERIFIED |
| UNUsace New River Chamber Batch Concrete Plt | Monaca | — | ◇ UNVERIFIED |
| UDU.s. Dol Osha | Chambersburg | — | ◇ UNVERIFIED |
| UOUsdol Osha | Susquehanna | — | ◇ UNVERIFIED |
| VCVacuum Ceramics, INC. | Mount Braddock | — | ◇ UNVERIFIED |
| VCVulcan Const Hanover Quarry & Carmeuse Lime Kilns | Hanover | — | ◇ UNVERIFIED |
| WCWesterwald Corporation of America | Scenery Hill | — | ◇ UNVERIFIED |
| WGWestmoreland Glass Block | North Huntingdon | — | ◇ UNVERIFIED |
| WGWienerberger Group (general Shale) | Darlington | — | ◇ UNVERIFIED |
