| TTThermal Transfer CORP | Duquesne | — | ◐ LIKELY ACTIVE |
| TEThomas Erie INC | Girard | 20–99 | ◐ LIKELY ACTIVE |
| TMTonnard Manufacturing CORP | Corry | 20–99 | ◐ LIKELY ACTIVE |
| TKTri Kris CO INC | Lansdale | 20–99 | ◐ LIKELY ACTIVE |
| UAUS Army Scranton Army Ammunition Plant | Scranton | — | ◐ LIKELY ACTIVE |
| UBUS Boiler INC | Lancaster | 100–499 | ◐ LIKELY ACTIVE |
| VTViking Tool & Gage | Conneaut Lake | 100–499 | ◐ LIKELY ACTIVE |
| VCVorteq Coil Finishers/valencia Plt | Valencia | — | ◐ LIKELY ACTIVE |
| VLV&s Lebanon Galvanizing LLC | Jonestown | 20–99 | ◐ LIKELY ACTIVE |
| WSWheatland Steel Processing | Hermitage | 20–99 | ◐ LIKELY ACTIVE |
| WIWoodward, Incorporated | Mars | 20–99 | ◐ LIKELY ACTIVE |
| YGYoung Galvanizing | Pulaski | — | ◐ LIKELY ACTIVE |
| ZMZippo Mfg Co/congress St | Bradford | — | ◐ LIKELY ACTIVE |
Amuneal Manufacturing CORP | Philadelphia | — | ◐ LIKELY ACTIVE |
| ATApex Tool Group Campbell Operations | York | — | ◐ LIKELY ACTIVE |
| AAAssa Abloy Svc Ctr/forks Twp | Easton | — | ◐ LIKELY ACTIVE |
| CMCampbell Manufacturing LLC | Bechtelsville | — | ◐ LIKELY ACTIVE |
| DMDf Mfg Inc/hydro Carbide Tool CO | Latrobe | — | ◐ LIKELY ACTIVE |
| EMEriez Mfg Co/erie | Erie | — | ◐ LIKELY ACTIVE |
| HMHoltec Manufacturing | East Pittsburgh | — | ◐ LIKELY ACTIVE |
| IIIntermetro Ind Corp/plt 1 | Wilkes Barre | — | ◐ LIKELY ACTIVE |
| ICItt Corp/hempfield | Lancaster, City of | — | ◐ LIKELY ACTIVE |
| KMKloeckner Metals/york | York | — | ◐ LIKELY ACTIVE |
Lippert Components INC Plant 7 | Denver | — | ◐ LIKELY ACTIVE |
| MFMeadville Forging Co/meadville Plt | Meadville | — | ◐ LIKELY ACTIVE |
| MMetalkraft | Charleston | — | ◐ LIKELY ACTIVE |
| MSMilton Steel CO | Milton | — | ◐ LIKELY ACTIVE |
| PRPhiladelphia Rust-proof CO INC | Philadelphia | — | ◐ LIKELY ACTIVE |
| STSps Tech Inc/abington | Jenkintown | — | ◐ LIKELY ACTIVE |
| SIStar Iron Works | Big Run | — | ◐ LIKELY ACTIVE |
| TATate Access Floors/red Lion | Red Lion | — | ◐ LIKELY ACTIVE |
| TATriangle Auto Spring Company Incorporated | Dubois | — | ◐ LIKELY ACTIVE |
| VPValmont Pittsburgh Galvanizing | Midland | — | ◐ LIKELY ACTIVE |
| WCWr Case & Sons Cutlery Co/bradford | Bradford | — | ◐ LIKELY ACTIVE |
| ASAbraservice Sharon | Sharon | — | ◇ UNVERIFIED |
| ATAmes True Temper INC | Camp Hill | — | ◇ UNVERIFIED |
Amz Manufacturing | York | — | ◇ UNVERIFIED |
| AFAnderson Fittings | Brave | — | ◇ UNVERIFIED |
| APAti Precision Finishing LLC - Monaca | Monaca | — | ◇ UNVERIFIED |
| APAti Precision Finishing LLC - Rochester Facility | Rochester | — | ◇ UNVERIFIED |
| APAti Precision Finishing LLC - Zelienople | Zelienople | — | ◇ UNVERIFIED |
| BMBrandywine Mach CO INC | Downingtown | — | ◇ UNVERIFIED |
| CCCarbon City Prods | Saint Marys | — | ◇ UNVERIFIED |
| CIChannellock Inc/plt 2 Cussewago | Meadville | — | ◇ UNVERIFIED |
| CRChicago Rivet & Mach/tyrone Plt | Tyrone | — | ◇ UNVERIFIED |
| CICornell Iron Works | Mountain Top | — | ◇ UNVERIFIED |
| DIDuctmate Industries INC | Monongahela | — | ◇ UNVERIFIED |
| DMDurabla Manufacturing CO | Exton | — | ◇ UNVERIFIED |
| ESElco Sintered Alloys CO INC | Kersey | — | ◇ UNVERIFIED |
| ESEmporium Specialties/foster Ave Plt | Austin | — | ◇ UNVERIFIED |