| OFOberon Fuels Kershaw Facility | Brawley | CA | — | ◇ UNVERIFIED |
| OObiter | Champaign | IL | — | ◇ UNVERIFIED |
| OCOccidental Chemical CORP | Mobile | AL | — | ◇ UNVERIFIED |
| OCOccidental Chemical CORP | New Castle | DE | — | ◇ UNVERIFIED |
| OCOccidental Chemical CORP. | Niagara Falls | NY | — | ◇ UNVERIFIED |
| OCOccidental Chemical Corporation | Jersey City | NJ | — | ◇ UNVERIFIED |
| OCOccidental Chemical Corporation – Augusta Silicate Plant | Augusta | GA | — | ◇ UNVERIFIED |
| OAOci Alabama LLC | Decatur | AL | — | ◇ UNVERIFIED |
| OAOhio Aluminum Chemicals LLC | Hamilton | OH | — | ◇ UNVERIFIED |
| OMOklahoma Materials Recycling | Atoka | OK | — | ◇ UNVERIFIED |
| OSOklahoma Steel Castings | Tulsa | OK | — | ◇ UNVERIFIED |
| OBOld Bridge Chemicals INC | Old Bridge Twp | NJ | — | ◇ UNVERIFIED |
| OLOld Line Environmental, INC. | Curtis Bay | MD | — | ◇ UNVERIFIED |
| 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 |
| OIOmniprint International | Costa Mesa | CA | — | ◇ UNVERIFIED |
| OIOmniprint International | Irvine | CA | — | ◇ UNVERIFIED |
| OIOmya, INC. (n7709) | Escanaba | MI | — | ◇ UNVERIFIED |
| OCOrange Carbon Black Plant | Orange | TX | — | ◇ UNVERIFIED |
| OMOrasis Medical | Laguna Hills | CA | — | ◇ UNVERIFIED |
 Organic Dyes and Pigments | Providence | RI | — | ◇ UNVERIFIED |
| OEOrion Engineered Carbons, LLC. | Franklin | LA | — | ◇ UNVERIFIED |
| OEOrion Engineered Carbons LLC - Ivanhoe Carbon Black Plant | Franklin | LA | — | ◇ UNVERIFIED |
| OBOsprey Biotechnics | Sarasota | FL | — | ◇ UNVERIFIED |
| OEOxbow Energy Solutions | Texas City | TX | — | ◇ UNVERIFIED |
| OIOxford Immunotec USA Marlborough | Marlborough | MA | — | ◇ UNVERIFIED |
| OVOxy Vinyls LP - Deer Park Vcm Facility | Deer Park | 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 |
| 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 |
| PAPan American Fertilizer | Guanica | PR | — | ◇ UNVERIFIED |
| PMPandora Methanol LLC | Nederland | TX | — | ◇ UNVERIFIED |
| PPParallel Products of Florida, INC. | Bartow | FL | — | ◇ UNVERIFIED |
| PAParson Adhesives Incorporated | Evansville | IN | — | ◇ UNVERIFIED |
| PCParts Cleaning Technologies LLC | Indianapolis | IN | — | ◇ UNVERIFIED |
| PPPasadena Plant | Pasadena | TX | — | ◇ UNVERIFIED |
| PCPaslode CO | Covington | TN | — | ◇ UNVERIFIED |
| PAPatriot Allied Solutions LLC | Hagerman | ID | — | ◇ UNVERIFIED |
| PBPatterson Brother's Lighting INC | Lakeside | CA | — | ◇ UNVERIFIED |
| PUPat Uchida Property | Kelso | WA | — | ◇ UNVERIFIED |
| PCPaxar Corporation | Sayre | PA | — | ◇ UNVERIFIED |
| PPPcs Phosphate Company Inc-joplin Plant | Joplin | MO | — | ◇ UNVERIFIED |
| PEPe Ell Hulk Hauling | Aberdeen | WA | — | ◇ UNVERIFIED |
| PTPellucere Technologies | Springdale | AR | — | ◇ UNVERIFIED |
| PCPemco Corporation | Baltimore | MD | — | ◇ UNVERIFIED |
| PSPencco Sealy | Sealy | TX | — | ◇ UNVERIFIED |
| PSPerimeter Solutions Burns Seat Base | Burns | OR | — | ◇ UNVERIFIED |
| PSPerimeter Solutions LP | Santa Rosa | CA | — | ◇ UNVERIFIED |
| PSPerimeter Solutions Ontario Seat Base | Ontario Heights | OR | — | ◇ UNVERIFIED |
| PTPeroxychem Tonawanda Plant | Tonawanda | NY | — | ◇ UNVERIFIED |
| PSPerpetual Screen Printing INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| PRPeru Recycling Facility | Sparks | NV | — | ◇ UNVERIFIED |
| PPPetoleum Product Supply, LLC | Guaynabo | PR | — | ◇ UNVERIFIED |
| PCPetra Chemical CO | Dallas | TX | — | ◇ UNVERIFIED |
| PBPflaumer Brothers | Ewing | NJ | — | ◇ UNVERIFIED |
| PIPfp Industries LLC | Evanston | WY | — | ◇ UNVERIFIED |
| PIPha Industries | Orange | MA | — | ◇ UNVERIFIED |
| PIPharmasyn INC | Libertyville | IL | — | ◇ UNVERIFIED |
| POPharmscript of Texas North | Tyler | TX | — | ◇ UNVERIFIED |
| P6Phillips 66 Caustic Scrubber Material | New Castle | DE | — | ◇ UNVERIFIED |
| PBPhoenix Bio Industries LLC | Goshen | CA | — | ◇ UNVERIFIED |
| POPhotography Outlet Dba Backdrop Outlet | Oceanside | CA | — | ◇ UNVERIFIED |
| PTPhotoprotective Technologies | San Antonio | TX | — | ◇ UNVERIFIED |
| PSPhoto Systems INC | Dexter | MI | — | ◇ UNVERIFIED |
| PLPiedmont Lithium Carolinas, INC. - Kings Moun ** Inactive ** | Kings Mountain | NC | — | ◇ UNVERIFIED |
| PWPierce White | Dyersburg | TN | — | ◇ UNVERIFIED |
| PIPiling, INC. | Freeport | TX | — | ◇ UNVERIFIED |
| PPPiney Point Phosphogypsum Stack System | Palmetto | FL | — | ◇ UNVERIFIED |
| PAPioneer Americas INC | Tacoma | WA | — | ◇ UNVERIFIED |
| PAPioneer Americas LLC | Henderson | NV | — | ◇ UNVERIFIED |
| PAPioneer Americas LLC Dba Olin Chlor Alkali Tracy | Tracy | CA | — | ◇ UNVERIFIED |
| PHPioneer Hi-bred International | Hayward | CA | — | ◇ UNVERIFIED |
| PIPixel Imaging | Vista | CA | — | ◇ UNVERIFIED |
| PBPlasmine Bay Minette | Bay Minette | AL | — | ◇ UNVERIFIED |
| PTPlymouth Technology, Inc. | Rochester Hills | MI | — | ◇ UNVERIFIED |
| PIP.m.c., INC. | Calhoun | GA | — | ◇ UNVERIFIED |
| POPmc Organometallix | Axis | AL | — | ◇ UNVERIFIED |
| PIPolarome International | Newark | NJ | — | ◇ UNVERIFIED |
| PPolimeros | Longview | TX | — | ◇ UNVERIFIED |
| PCPolo Cleaners 2 | Middletown | RI | — | ◇ UNVERIFIED |
 Polycarbon Industries INC | Ayer | MA | — | ◇ UNVERIFIED |
| PSPolychem Services Inc., LLC | Chicago Heights | IL | — | ◇ UNVERIFIED |
| PIPolydyne INC. | Elk Grove | CA | — | ◇ UNVERIFIED |
| PCPolymerine CO INC | New Bedford | MA | — | ◇ UNVERIFIED |
| PLPolymerine LTD | New Bedford, City of | MA | — | ◇ UNVERIFIED |
| PCPoole Chemical CO | Monte Vista 4.1 Mi. Se of | CO | — | ◇ UNVERIFIED |
