| ECEvco Corporation | Tarentum | — | ◇ UNVERIFIED |
| FMFrank Mance Plating, LLC | Pittsburgh | — | ◇ UNVERIFIED |
| FCFrank's Custom Stainless | Pittsburgh | — | ◇ UNVERIFIED |
| FWFreedom Way Associates, LP | Gibsonia | — | ◇ UNVERIFIED |
| GAGe Additive Pittsburgh | Imperial | — | ◇ UNVERIFIED |
| HMHennemuth Metal Fabricators, INC. | Oakdale | — | ◇ UNVERIFIED |
| HSHinkel-hofmann Supply Company | Pittsburgh | — | ◇ UNVERIFIED |
| HRH R Leuenberger Incorporated | Allison Park | — | ◇ UNVERIFIED |
| KCKeystone Custom Fabricators, INC. | Elizabeth | — | ◇ UNVERIFIED |
| KMKincaid Manufacturing INC. | Verona | — | ◇ UNVERIFIED |
| LELee Evans INC. | Pittsburgh | — | ◇ UNVERIFIED |
| LCLub Co | Pittsburgh | — | ◇ UNVERIFIED |
| MPMance Plating Company | Imperial | — | ◇ UNVERIFIED |
| MIMarstrand Industries, INC. | Pittsburgh | — | ◇ UNVERIFIED |
| MMMatt Machine & Manufacturing, INC. | Pittsburgh | — | ◇ UNVERIFIED |
| MCM.e. Cunningham CO. | Ingomar | — | ◇ UNVERIFIED |
| MMMelampy Manufacturing CO. | Gibsonia | — | ◇ UNVERIFIED |
| MMMelfred Manufacturing Company, INC. | Pittsburgh | — | ◇ UNVERIFIED |
| MSMendel Steel & Ornamental Iron Company | Bethel Park | — | ◇ UNVERIFIED |
| MTMetal Treating Company | Pittsburgh | — | ◇ UNVERIFIED |
| MVMillvale Vault | Glenshaw | — | ◇ UNVERIFIED |
| MMMinnotte Manufacturing Corporation | Trafford | — | ◇ UNVERIFIED |
| MRMontgomery Roessing Company | Pittsburgh | — | ◇ UNVERIFIED |
| MIMunroe, Incorporated | Pittsburgh | — | ◇ UNVERIFIED |
| OLOiw LLC | Oakdale | — | ◇ UNVERIFIED |
| PLPdc, LLC | Coraopolis | — | ◇ UNVERIFIED |
| PDPennsylvania Drilling Company, INC. | Mc Kees Rocks | — | ◇ UNVERIFIED |
| PMPitt-des Moines, INC. | Pittsburgh | — | ◇ UNVERIFIED |
| PIPowertrack INC. | Pittsburgh | — | ◇ UNVERIFIED |
| QIQ-tek, INC. | Crescent | — | ◇ UNVERIFIED |
| RVRed Valve Company, INC. | Carnegie | — | ◇ UNVERIFIED |
| SMSac Manufacturing Company | Pittsburgh | — | ◇ UNVERIFIED |
| SSSafety Sling Company, INC. | Pittsburgh | — | ◇ UNVERIFIED |
| SLSologrip LLC | Wexford | — | ◇ UNVERIFIED |
| SCSpaid Corporation, INC. | Pittsburgh | — | ◇ UNVERIFIED |
 Spectrum Metal Finishing, INC. | Pittsburgh | — | ◇ UNVERIFIED |
| SISuperbolt, INC | Carnegie | — | ◇ UNVERIFIED |
| TITamco Incorporated | Monongahela | — | ◇ UNVERIFIED |
| TIThermo Industries, INC. | Carnegie | — | ◇ UNVERIFIED |
| TIThermo-twin Industries, INC. | Oakmont | — | ◇ UNVERIFIED |
| TRThree Rivers Steel Corporation | Oakdale | — | ◇ UNVERIFIED |
| UMUnique Machine & Tool | Mc Kees Rocks | — | ◇ UNVERIFIED |
| VFV.b. Fabricators, INC. | Glenshaw | — | ◇ UNVERIFIED |
| VWVegely Welding INC. | Duquesne | — | ◇ UNVERIFIED |
| VIVulcan Industries | Coraopolis | — | ◇ UNVERIFIED |
| WSWelded Sheet Metal Manufacturing, LLC | Pittsburgh | — | ◇ UNVERIFIED |
| ZGZia-tech Gear Manufacturing INC. | Pittsburgh | — | ◇ UNVERIFIED |
| ZSZottola Steel Corporation | Pittsburgh | — | ◇ UNVERIFIED |
