| AAAmerican Architectural Metal Manufacturers, INC. | Allentown | — | ◐ LIKELY ACTIVE |
American Manufacturing & Engineering, INC. | Montgomeryville | — | ◐ LIKELY ACTIVE |
| ACAppellation Const Svc Llc/williamsport Plt | Williamsport | — | ◐ LIKELY ACTIVE |
| AIAPX Industrial Coatings | Saint Thomas | 1–19 | ◐ LIKELY ACTIVE |
| AMApx Mitchell Machine Shop | Greencastle | 1–19 | ◐ LIKELY ACTIVE |
| AYApx - York Sheet Metal, Incorporated | York | 20–99 | ◐ LIKELY ACTIVE |
| ACArmology CO of Philadelphia | Croydon | — | ◐ LIKELY ACTIVE |
| ATAtlantic Track & Turnout CO. | Saint Clair | 20–99 | ◐ LIKELY ACTIVE |
| BABall Aerosol & Speciality Container Horsham Plt | Horsham | — | ◐ LIKELY ACTIVE |
| BRBear Ridge Machine & Fabrication INC. | Frackville | — | ◐ LIKELY ACTIVE |
| BPBergen Pipe Supports | Donora | 20–99 | ◐ LIKELY ACTIVE |
| BFBlackbird Fabrication, LLC | Coatesville | — | ◐ LIKELY ACTIVE |
| BEBloom Engineering Company INC | Charleroi | 20–99 | ◐ LIKELY ACTIVE |
| BTBluewater Thermal Solutions - Ridgway | Ridgway | 20–99 | ◐ LIKELY ACTIVE |
| BRBosch Rexroth CORP | Bethlehem | 100–499 | ◐ LIKELY ACTIVE |
| BMBracalente Manufacturing CO INC | Trumbauersville | — | ◐ LIKELY ACTIVE |
Branch Medical Group - Lewis Road | Royersford | — | ◐ LIKELY ACTIVE |
| BABroad Axe & Lindenwold Clnr Svc | Ambler | — | ◐ LIKELY ACTIVE |
| BHBuckeye Hone Company - MERCER | Mercer | 20–99 | ◐ LIKELY ACTIVE |
| BYBWAY York | York | 100–499 | ◐ LIKELY ACTIVE |
| CUCanpack US Llc/olyphant | Philadelphia | — | ◐ LIKELY ACTIVE |
| CTCaptiveaire Truck Staging Parking Area | Bedford | — | ◐ LIKELY ACTIVE |
| CSCardinal Systems, INC. | Schuylkill Haven | 100–499 | ◐ LIKELY ACTIVE |
| CICarma Industrial Coatings INC - New Oxford | New Oxford | — | ◐ LIKELY ACTIVE |
| CFCcm Fabrication, INC. | Warminster | — | ◐ LIKELY ACTIVE |
| CRCenter Rock | Berlin | 20–99 | ◐ LIKELY ACTIVE |
| CIChannellock, Inc. Plant 2 | Meadville | 20–99 | ◐ LIKELY ACTIVE |
| CPChecon PAC | Kersey | 20–99 | ◐ LIKELY ACTIVE |
| CRCMC Rebar York | York | 20–99 | ◐ LIKELY ACTIVE |
| CICoinco INC | Cochranton | 20–99 | ◐ LIKELY ACTIVE |
| CICoinco INC Dba Morco/morco | Cochranton | — | ◐ LIKELY ACTIVE |
| CIConnex, INC. | Fairview | 20–99 | ◐ LIKELY ACTIVE |
| CSConshohocken Steel Prod / Ambler | Ambler | — | ◐ LIKELY ACTIVE |
| CSConstruction Specialties INC | Montgomery | — | ◐ LIKELY ACTIVE |
| CSConstruction Specialties INC | Muncy | — | ◐ LIKELY ACTIVE |
Container Research CORP | Glen Riddle | — | ◐ LIKELY ACTIVE |
| CMCoolspring Mining In/coolspring Quarry | Hopwood | — | ◐ LIKELY ACTIVE |
| CICornellcookson, INC. | Mountain Top | 500+ | ◐ LIKELY ACTIVE |
| CICp Industry INC | Mckeesport | — | ◐ LIKELY ACTIVE |
| CFCraftweld Fabrication Co., INC. | Montgomeryville | 20–99 | ◐ LIKELY ACTIVE |
| CVCrispin Valve Multiplex MFG Co. INC. | Berwick | 20–99 | ◐ LIKELY ACTIVE |
| DLDeer Lake Metal Sales Manufacturing Corporation | Orwigsburg | 20–99 | ◐ LIKELY ACTIVE |
| DDDent Design Hardware | Bethlehem | — | ◐ LIKELY ACTIVE |
| DLDirect Ltx/bern Twp Fac | Reading | — | ◐ LIKELY ACTIVE |
| DGDl George & Sons Mfg Inc/waynesboro 6th St | Waynesboro | — | ◐ LIKELY ACTIVE |
| DCDor-set Corporation | Bristol | 20–99 | ◐ LIKELY ACTIVE |
| DIDudlik Industries INC. | Hatboro | — | ◐ LIKELY ACTIVE |
| DPDura-Metal Products Corporation | Irwin | 20–99 | ◐ LIKELY ACTIVE |
| ECE C Fence & Iron Works, INC. | Norristown | — | ◐ LIKELY ACTIVE |
| EIEdlon INC. | Avondale | 20–99 | ◐ LIKELY ACTIVE |