| OFOligo Factory INC | Holliston | MA | — | ◇ UNVERIFIED |
| OBOlin - Blue Cube Operations, LLC | Plaquemine | LA | — | ◇ UNVERIFIED |
| OCOlin CORP Lake Charles Plant | Westlake | LA | — | ◇ UNVERIFIED |
| OCOlin Corporation | Manchester | TN | — | ◇ UNVERIFIED |
| OROlin Rd Crude Butadiene Ms Mc 43 44 | Beaumont | TX | — | ◇ UNVERIFIED |
| OCOliver Chemical CO INC | Cincinnati | OH | — | ◇ UNVERIFIED |
| OTOmaha Transloading Corporation | Omaha | NE | — | ◇ UNVERIFIED |
| OCOmega Chemical CORP Omega Reco | Whittier | CA | — | ◇ UNVERIFIED |
| OEOmg Electronic Chemicals LLC | Newark | NJ | — | ◇ UNVERIFIED |
| OSOmni Southeastern Chem | Sumter | SC | — | ◇ UNVERIFIED |
| OIOmya, INC. (n7709) | Escanaba | MI | — | ◇ UNVERIFIED |
| OFOneok Field Services-bushton | Bushton | KS | — | ◇ UNVERIFIED |
| OPOnline Packaging INC | Plover | WI | — | ◇ UNVERIFIED |
| OTOn Target Staffing, LLC | Auburndale | FL | — | ◇ UNVERIFIED |
| OCOrange Carbon Black Plant | Orange | TX | — | ◇ UNVERIFIED |
| OMOrasis Medical | Laguna Hills | CA | — | ◇ UNVERIFIED |
 Organic Dyes and Pigments | Providence | RI | — | ◇ UNVERIFIED |
| OFOrganic Filling Solutions LLC | Chatsworth | CA | — | ◇ UNVERIFIED |
| OEOrion Engineered Carbons, LLC. | Franklin | LA | — | ◇ UNVERIFIED |
| OEOrion Engineered Carbons LLC - Ivanhoe Carbon Black Plant | Franklin | LA | — | ◇ UNVERIFIED |
| OBOsprey Biotechnics | Sarasota | FL | — | ◇ UNVERIFIED |
| OCOur Cleaners | Whittier | CA | — | ◇ UNVERIFIED |
| OCOverdale CORP | Alsip | IL | — | ◇ UNVERIFIED |
| OEOxbow Energy Solutions | Texas City | TX | — | ◇ UNVERIFIED |
| OIOxford Immunotec USA Marlborough | Marlborough | MA | — | ◇ UNVERIFIED |
| OVOxy Vinyls Deer Park Vcm Plant | Deer Park | TX | — | ◇ UNVERIFIED |
| OVOxy Vinyls LP - Deer Park Vcm Facility | Deer Park | TX | — | ◇ UNVERIFIED |
| OCOyster Creek | Freeport | TX | — | ◇ UNVERIFIED |
| OCOyster Creek Unit Viii | Freeport | TX | — | ◇ UNVERIFIED |
| PSP2 Sciences INC. | Naugatuck | CT | — | ◇ UNVERIFIED |
| PPP4 Production LLC (tv Facility) | Soda Springs | ID | — | ◇ UNVERIFIED |
| PPPacheco Plaza Cleaners | Novato | CA | — | ◇ UNVERIFIED |
| PBPacific Biodiesel INC | Kahului | HI | — | ◇ UNVERIFIED |
| PCPacific Compounding Pharmacy | Stockton | CA | — | ◇ UNVERIFIED |
| PHPacific Hydrotech Corporation | Mission Viejo | CA | — | ◇ UNVERIFIED |
 Pacific Industrial Development Corporation | Spartanburg | SC | — | ◇ UNVERIFIED |
| PLPacific Light Technologies | Portland | OR | — | ◇ UNVERIFIED |
| PWPacific West Chemical CORP | Berkeley | CA | — | ◇ UNVERIFIED |
| PSPackers Sanitation Services INC | Portland | OR | — | ◇ UNVERIFIED |
| PSPackers Sanitation Services, INC. | Oakland | IA | — | ◇ UNVERIFIED |
| PSPackers Sanitation Services, INC. | Schuyler | NE | — | ◇ UNVERIFIED |
| PPPact Pharma INC | Riverside | CA | — | ◇ UNVERIFIED |
 Pajarito Powder | Albuquerque | NM | — | ◇ UNVERIFIED |
| PTPAK Technologies Holding Company Inc. | Milwaukee | WI | — | ◇ UNVERIFIED |
| PDPampa Development & Manufacturing Center | Pampa | TX | — | ◇ UNVERIFIED |
| PMPandora Methanol LLC | Nederland | TX | — | ◇ UNVERIFIED |
| PTParadis Tank Battery #3 | Paradis | LA | — | ◇ UNVERIFIED |
| PPParallel Products of Florida, INC. | Bartow | FL | — | ◇ UNVERIFIED |
| PSParker Solvents Company, INC. | Little Rock | AR | — | ◇ UNVERIFIED |
| PIParsan, INC. Dba Roscoe Fuel Station | Van Nuys | CA | — | ◇ UNVERIFIED |
