Nyco America LLC | Newnan | GA | 20–99 | ● ACTIVE |
| NCNylon Corporation of America | Manchester | NH | 20–99 | ● ACTIVE |
| OCOccidental Chemical Corporation - Muscle Shoals Plant | Muscle Shoals | AL | 20–99 | ● ACTIVE |
| OCOccidental Chemical Corporation - Wichita Plant | Wichita | KS | 100–499 | ● ACTIVE |
| OCOlin Chlor-alkali, Charleston Plant | Charleston | TN | 100–499 | ● ACTIVE |
| OCOlin CORP. Mcintosh, Alabama Plant | Mc Intosh | AL | 100–499 | ● ACTIVE |
Omega Bio-tek, INC. | Norcross | GA | — | ● ACTIVE |
Optima Chemical Group LLC | Douglas | GA | 100–499 | ● ACTIVE |
Organic Standard Solutions International LLC | North Charleston | SC | 20–99 | ● ACTIVE |
| OEOrion Engineered Carbons | Belpre | OH | 20–99 | ● ACTIVE |
| OOrtec:easley | Easley | SC | 100–499 | ● ACTIVE |
Oxford Performance Materials, INC. | South Windsor | CT | 20–99 | ● ACTIVE |
| PIPalmer Intl INC | Skippack | PA | 20–99 | ● ACTIVE |
Perimeter Solutions LP | Green Bay | WI | — | ● ACTIVE |
| PTPhibro Tech INC | Santa Fe Springs | CA | 20–99 | ● ACTIVE |
| P6Phillips 66 Bayway Refinery | Linden | NJ | 500+ | ● ACTIVE |
| P6Phillips 66 - Billings Refinery | Billings | MT | 100–499 | ● ACTIVE |
| P6Phillips 66 Refinery | Ferndale | WA | 100–499 | ● ACTIVE |
Placid Refining Company LLC | Port Allen | LA | 100–499 | ● ACTIVE |
| PIPlaskolite INC | Zanesville | OH | 100–499 | ● ACTIVE |
| PLPlaskolite, LLC. | Columbus | OH | 100–499 | ● ACTIVE |
Pleiger Plastic Company, Lllp | Washington | PA | 20–99 | ● ACTIVE |
| POPmc Organometallix INC | Carrollton | KY | 100–499 | ● ACTIVE |
| PUPolyplex USA LLC | Decatur | AL | 100–499 | ● ACTIVE |
Polysciences INC | Warrington | PA | 100–499 | ● ACTIVE |
Polytek Development CORP | Easton | PA | 20–99 | ● ACTIVE |
| PMPrefere Melamines | Springfield | MA | 20–99 | ● ACTIVE |
| PRPremcor Refining Group INC - Lima Refinery | Lima | OH | 500+ | ● ACTIVE |
| PPrimester | Kingsport | TN | 20–99 | ● ACTIVE |
| PAProctor and Gamble Manufacturing Co., the | Kansas City | KS | 20–99 | ● ACTIVE |
| PZPurity Zinc Metals, LLC | Clarksville | TN | 20–99 | ● ACTIVE |
| PLPyromet LLC | Aston | PA | 20–99 | ● ACTIVE |
Qsa Global INC | Burlington | MA | 20–99 | ● ACTIVE |
Quantum Innovations INC | Central Point | OR | — | ● ACTIVE |
Reg Geismar, LLC | Geismar | LA | 100–499 | ● ACTIVE |
| RTRegis Technologies INC | Morton Grove | IL | 20–99 | ● ACTIVE |
| RSReg Seneca, LLC | Seneca | IL | 20–99 | ● ACTIVE |
| RMResinall Mississippi - Hattiesburg | Hattiesburg | MS | 100–499 | ● ACTIVE |
Reynolds Polymer Technology, INC. | Grand Junction | CO | 20–99 | ● ACTIVE |
| RCRimtec Corporation | Burlington Twp | NJ | 20–99 | ● ACTIVE |
Rochester Midland Corporation | Rochester | NY | — | ● ACTIVE |
Rogers Corporation | Woodstock | CT | 100–499 | ● ACTIVE |
| RARohm and Haas Chemicals Bayport | La Porte | TX | 100–499 | ● ACTIVE |
| SISabic Innovative Plastics US LLC | Ottawa | IL | 100–499 | ● ACTIVE |
| SPSaint-gobain Performance Plastics Corporation | Bristol | RI | 100–499 | ● ACTIVE |
| SLSanders Lead Company | Troy | AL | 500+ | ● ACTIVE |
| SISentry Industries INC | Miami | FL | 20–99 | ● ACTIVE |
| SCShakespeare Company, LLC | Columbia | SC | 100–499 | ● ACTIVE |
| SCShell Catalysts &technologies | Bay Point | CA | 1–19 | ● ACTIVE |
| SCShepherd Chemical CO (1431370150) | Norwood | OH | 100–499 | ● ACTIVE |