| VRVesuvius Research Pittsburgh - Advanced Refractories | Pittsburgh | 1–19 | ◐ LIKELY ACTIVE |
| ARAdvanced Refractory Technologies | Carnegie | — | ◇ UNVERIFIED |
| AIAlmatis Inc/neville Grinding Ctr | Leetsdale | — | ◇ UNVERIFIED |
| APA P, Rhodes LLC | Pittsburgh | — | ◇ UNVERIFIED |
| ACArrow Concrete Company | Pittsburgh | — | ◇ UNVERIFIED |
| BCBrentanos Concrete Connection, INC. | Pittsburgh | — | ◇ UNVERIFIED |
| CBCarlini Brothers CO. | Pittsburgh | — | ◇ UNVERIFIED |
| EBEles Brothers Ready Mix Concrete | Monroeville | — | ◇ UNVERIFIED |
| FSFlabeg Solar US Corp/clinton | Clinton | — | ◇ UNVERIFIED |
| HTHarmarville Temporary Batch Plant Project | Harmar, Township of | — | ◇ UNVERIFIED |
| HWHickman Williams & Company | Etna | — | ◇ UNVERIFIED |
| HCHowell Craft INC. | Elizabeth | — | ◇ UNVERIFIED |
| HIHpkd INC. | Pittsburgh | — | ◇ UNVERIFIED |
| JCJmm Concrete Designs LLC | Pittsburgh | — | ◇ UNVERIFIED |
| KLKischland LLC | Pittsburgh | — | ◇ UNVERIFIED |
| LHLane Holdings | Carnegie | — | ◇ UNVERIFIED |
| LCLesney Concrete Specialist | Tarentum | — | ◇ UNVERIFIED |
| LULexmar USA | Mckeesport | — | ◇ UNVERIFIED |
| L3Lock 3 Company | Monongahela | — | ◇ UNVERIFIED |
| MPMineral Processing Specialties Inc. | Springdale | — | ◇ UNVERIFIED |
| PCPatn Capital LLC | Pittsburgh | — | ◇ UNVERIFIED |
| PCPATN Captial LLC | Pittsburgh | — | ◇ UNVERIFIED |
| RIRBF Industries, LLC | Pittsburgh | — | ◇ UNVERIFIED |
| RPResco Products, INC. | Tarentum | — | ◇ UNVERIFIED |
| RGRoth Glass CO. | Pittsburgh | — | ◇ UNVERIFIED |
| SHSouth Hills Cement Contracting | Pittsburgh | — | ◇ 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 |
| TLTaktl, LLC | Glenshaw | — | ◇ UNVERIFIED |
| TLThe Lane Construction Crafton | Pittsburgh, Pa | — | ◇ UNVERIFIED |
| TWThe Window Factory | Pittsburgh | — | ◇ UNVERIFIED |
| TGTroy Granite | Pittsburgh | — | ◇ UNVERIFIED |
| UGUltimate Granite Surfaces, INC. | Gibsonia | — | ◇ UNVERIFIED |
| USUnited States Products CO. | Pittsburgh | — | ◇ UNVERIFIED |
