| KNKeystate Natural Gas Synthesis LLC | Bellefonte | PA | Chemical Manufacturing325199 | — | ◐ LIKELY ACTIVE |
| KCKeystone Composting Solutions, LLC | Honey Brook | PA | Chemical Manufacturing325315 | — | ◐ LIKELY ACTIVE |
| KBKrystal Biotech, Inc. | Pittsburgh | PA | Chemical Manufacturing325414 | 100-499 | ◐ LIKELY ACTIVE |
| KBKrystal Biotech, Inc - Astra | Coraopolis | PA | Chemical Manufacturing325414 | 20-99 | ◐ LIKELY ACTIVE |
| LBLampire Biological Labs INC | Ottsville | PA | Chemical Manufacturing325414 | — | ◐ LIKELY ACTIVE |
| LBLancaster Branch 31 | Lancaster | PA | Chemical Manufacturing325120 | 1-19 | ◐ LIKELY ACTIVE |
| LILATICRETE International Inc - Pottstown | Pottstown | PA | Chemical Manufacturing325520 | 1-19 | ◐ LIKELY ACTIVE |
| LVLaurel Valley Farms | Landenberg | PA | Chemical Manufacturing325314 | 20-99 | ◐ LIKELY ACTIVE |
| LPLinde plc | Stockertown | PA | Chemical Manufacturing325120 | 20-99 | ◐ LIKELY ACTIVE |
| LPLinde plc Hatfield | Hatfield | PA | Chemical Manufacturing325120 | 20-99 | ◐ LIKELY ACTIVE |
| LHLouric Holdings LLC | Blairsville | PA | Chemical Manufacturing325620 | — | ◐ LIKELY ACTIVE |
| LILustra-line INC | Pittsburgh | PA | Chemical Manufacturing325992 | — | ◐ LIKELY ACTIVE |
Madrigal Pharmaceuticals, INC | Conshohocken | PA | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| MMalvern | Malvern | PA | Chemical Manufacturing325412 | 20-99 | ◐ LIKELY ACTIVE |
| MMcConnell | Stroudsburg | PA | Chemical Manufacturing325411 | 1-19 | ◐ LIKELY ACTIVE |
| MFMcGill Fairless Hills, LLC | Morrisville | PA | Chemical Manufacturing325315 | 1-19 | ◐ LIKELY ACTIVE |
| MIMinteq International INC. | Easton | PA | Chemical Manufacturing325510 | — | ◐ LIKELY ACTIVE |
| M1Minus 100, L.l.c | Waverly Township | PA | Chemical Manufacturing325130 | — | ▲ REPORTED CLOSED |
| MLMPA (Infinity LTL Engineering Compounds) | Morrisville | PA | Chemical Manufacturing325991 | 20-99 | ◐ LIKELY ACTIVE |
| MMyerstown | Myerstown | PA | Petroleum and Coal Products Manufacturing324122 | 500+ | ◐ LIKELY ACTIVE |
| NCNational Chemical Laboratories Distribution Center | Philadelphia | PA | Chemical Manufacturing325611 | 1-19 | ◐ LIKELY ACTIVE |
| NINavrogen INC | Glen Mills | PA | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| NINavrogen INC | Cheyney | PA | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| NBNew Brighton | New Brighton | PA | Chemical Manufacturing325120 | 1-19 | ◐ LIKELY ACTIVE |
| NTNexpera Tamaqua | Tamaqua | PA | Chemical Manufacturing325180 | 1-19 | ◐ LIKELY ACTIVE |
Norit Americas - Corporate and Remote | Horsham | PA | Chemical Manufacturing325998 | 20-99 | ◐ LIKELY ACTIVE |
| NFNouryon Functional Chemicals LLC | Radnor | PA | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| NBNous Biosciences INC | Doylestown | PA | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| NBNoveome Biotherapeutics INC | Pittsburgh | PA | Chemical Manufacturing325414 | — | ◐ LIKELY ACTIVE |
| OOOFI Ontelaunee Farms | Temple | PA | Chemical Manufacturing325314 | 20-99 | ◐ LIKELY ACTIVE |
| PPPalm Plant | Palm | PA | Chemical Manufacturing325120 | 20-99 | ◐ LIKELY ACTIVE |
| PPPatriot Pharmaceuticals LLC | Horsham | PA | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| PCPecora Corporation Distribution Center | Hatfield | PA | Chemical Manufacturing325520 | 20-99 | ◐ LIKELY ACTIVE |
Pelmor Laboratories, INC | Newtown | PA | Chemical Manufacturing325212 | — | ◐ LIKELY ACTIVE |
| PTPelseal Technologies, LLC | Bensalem | PA | Chemical Manufacturing325520 | — | ▲ REPORTED CLOSED |
| PCPenn Color PMC | Hatfield | PA | Chemical Manufacturing325510 | 100-499 | ◐ LIKELY ACTIVE |
| PHPenn Hills | Verona | PA | Chemical Manufacturing325120 | 1-19 | ◐ LIKELY ACTIVE |
| PLPenn Life Sciences | Langhorne | PA | Chemical Manufacturing325412 | 20-99 | ◐ LIKELY ACTIVE |
| PRPennsylvania - Royal Chemical | East Stroudsburg | PA | Chemical Manufacturing325611 | 20-99 | ◐ LIKELY ACTIVE |
| Ppharmablock | West Chester | PA | Chemical Manufacturing325412 | 20-99 | ◐ LIKELY ACTIVE |
| PPhiladelphia | Philadelphia | PA | Beverage and Tobacco Product Manufacturing312111 | 100-499 | ◐ LIKELY ACTIVE |
Piramal Pharma Solutions | Sellersville | PA | Chemical Manufacturing325412 | 100-499 | ◐ LIKELY ACTIVE |
| PGPleasant Gap Branch 42 | Pleasant Gap | PA | Chemical Manufacturing325120 | 1-19 | ◐ LIKELY ACTIVE |
Premier Magnesia - Aspers | Aspers | PA | Chemical Manufacturing325180 | 1-19 | ◐ LIKELY ACTIVE |
| PLPromethean Lifesciences INC | Pittsburgh | PA | Chemical Manufacturing325414 | — | ◐ LIKELY ACTIVE |
| PCPTLP Cranberry | Cranberry Township | PA | Chemical Manufacturing325998 | 20-99 | ◐ LIKELY ACTIVE |
| PAPurolite - An Ecolab Company | King of Prussia | PA | Chemical Manufacturing325412 | 20-99 | ◐ LIKELY ACTIVE |
| PEPurolite - Ecolab G Street | Philadelphia | PA | Chemical Manufacturing325211 | 20-99 | ◐ LIKELY ACTIVE |
| PLPurolite LLC | King of Prussia | PA | Chemical Manufacturing325211 | — | ◐ LIKELY ACTIVE |
| PPPur Products LLC | Berwyn | PA | Chemical Manufacturing325314 | — | ◐ LIKELY ACTIVE |