| OBO B I Linings | Chocowinity | NC | — | ◇ UNVERIFIED |
| OIOcci INC. Wwtp | Fulton | MO | — | ◇ UNVERIFIED |
| OSOcean Steel CORP | Conklin | NY | — | ◇ UNVERIFIED |
| OLOctave Labs LLC | Springfield | OR | — | ◇ UNVERIFIED |
| OLOctave Labs LLC | Pleasant Hill | OR | — | ◇ UNVERIFIED |
| OCOctober CO Chemetal Division | Easthampton | MA | — | ◇ UNVERIFIED |
| OIOctochem INC | Vandalia | IL | — | ◇ UNVERIFIED |
| OCOcv Control Valves Precision Coatings / Ocv Control Valves Precision Coatings | Tulsa | OK | — | ◇ UNVERIFIED |
| OIOddello Industries, LLC | Morristown | TN | — | ◇ UNVERIFIED |
| OGOec Graphics INC | Oshkosh | WI | — | ◇ UNVERIFIED |
| OIOemeta INC. | Salt Lake City | UT | — | ◇ UNVERIFIED |
| OFOem Fabricators INC | Neillsville | WI | — | ◇ UNVERIFIED |
| OBOerlikon Balzers | Lake Orion | MI | — | ◇ UNVERIFIED |
| OBOerlikon Balzers Coating USA INC | East Tawas | MI | — | ◇ UNVERIFIED |
| OBOerlikon Balzers Coating Usa, INC | Pell City | AL | — | ◇ UNVERIFIED |
| OBOerlikon Balzers USA INC | Rock Hill | SC | — | ◇ UNVERIFIED |
 Oerlikon Metco (us) INC. | Barboursville | WV | — | ◇ UNVERIFIED |
| OIOfco INC | Coshocton | OH | — | ◇ UNVERIFIED |
| OFOfs Fitel-sturbridge | Sturbridge | MA | — | ◇ UNVERIFIED |
| OIOfs International Houston Plant | Houston | TX | — | ◇ UNVERIFIED |
| OFOfs (optical Fiber Solutions) | Sturbridge | MA | — | ◇ UNVERIFIED |
| OCOglivie Company INC the | Astoria | OR | — | ◇ UNVERIFIED |
| OSOhio Steel Industries | Pataskala | OH | — | ◇ UNVERIFIED |
| OSOilfield Solutions Midland | Midland | TX | — | ◇ UNVERIFIED |
| OOldcastle | Elmer | NJ | — | ◇ UNVERIFIED |
| OIOldcastle Infrastructure | Kennedale | TX | — | ◇ UNVERIFIED |
| OCOld Country Millwork INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| OSOld School Market INC | Sullivan | IL | — | ◇ UNVERIFIED |
| OGOlen G. Parkhill Owner of Kendallwood Estates | Mahomet | IL | — | ◇ UNVERIFIED |
| OCOlin CORP - Moundsville Plant | Moundsville | WV | — | ◇ UNVERIFIED |
| OEOlson Engineering | Saint James | MN | — | ◇ UNVERIFIED |
| OCOlympic Chemical CORP | Tacoma | WA | — | ◇ UNVERIFIED |
| OFOlympic Fiberglass Industries | Rochester | IN | — | ◇ UNVERIFIED |
| OSOlympic Steel - Ps&w | Siler City | NC | — | ◇ UNVERIFIED |
| OIOmar INC | University Park | IL | — | ◇ UNVERIFIED |
| OCOmega Cabinetry | Clinton | TN | — | ◇ UNVERIFIED |
| ODOmega Demolition CORP | Rosemont | IL | — | ◇ UNVERIFIED |
| OEOmega Engineering INC | Bridgeport | NJ | — | ◇ UNVERIFIED |
| ONOmega Natchiq New Iberia Facility | New Iberia | LA | — | ◇ UNVERIFIED |
| OPOmega Packaging Dba Comar | La Mirada | CA | — | ◇ UNVERIFIED |
| ONOmer North America CORP | Sterling Heights | MI | — | ◇ UNVERIFIED |
| OEOmg Electronic Chemicals | South Plainfield | NJ | — | ◇ UNVERIFIED |
| OEOmg Electronic Chemicals LLC | Newark | NJ | — | ◇ UNVERIFIED |
| OMOmni Metals CO INC | Somersworth | NH | — | ◇ UNVERIFIED |
| OSOmnova Solutions INC. - Calhoun Latex Plant | Calhoun | GA | — | ◇ UNVERIFIED |
| OSO'neal Steel INC | Houston | TX | — | ◇ UNVERIFIED |
| OSO'neal Steel, INC. | Indianapolis | IN | — | ◇ UNVERIFIED |
| OSO'neal Steel INC I | Greensboro | NC | — | ◇ UNVERIFIED |
| OHOne Hour Express Dry Clnr/bethlehem | Bethlehem | PA | — | ◇ UNVERIFIED |
| OMOneida Molded Plastics LLC | Oneida | NY | — | ◇ UNVERIFIED |
| OMOne More Part Dba Omp | Longmont | CO | — | ◇ UNVERIFIED |
| OSOne Source Systems LLC | Vicksburg | MS | — | ◇ UNVERIFIED |
| OIOno Industries INC | Ono | PA | — | ◇ UNVERIFIED |
| OBOntegra Brighton | Brighton | MI | — | ◇ UNVERIFIED |
| OBOpen Book Extracts | Roxboro | NC | — | ◇ UNVERIFIED |
| OLOpen Loop Energy - Nichols Facility | Safford | AZ | — | ◇ UNVERIFIED |
| OMOpen Molded Plastics, INC. | Wagoner | OK | — | ◇ UNVERIFIED |
| OIOptiblend Industries-cambridge | Cambridge | OH | — | ◇ UNVERIFIED |
| OIOptiblend Industries, INC. | Midland | TX | — | ◇ UNVERIFIED |
| OGOptima Graphics-fenton | Fenton | MO | — | ◇ UNVERIFIED |
| OSOptimas Solutions | Wood Dale | IL | — | ◇ UNVERIFIED |
| OIOptim Incorporated | North Brookfield | MA | — | ◇ UNVERIFIED |
| OROquawka River Terminal | Gladstone | IL | — | ◇ UNVERIFIED |
| OSOrange State Steel Construction, INC | Pinellas Park | FL | — | ◇ UNVERIFIED |
| OCOrbis Corporation | Manchester | IA | — | ◇ UNVERIFIED |
| OOOrchid Orthopedics | Arcadia | CA | — | ◇ UNVERIFIED |
| OOOrchid Orthopedic Solutions | Bridgeport | MI | — | ◇ UNVERIFIED |
| OOOrchid Orthopedics Solutions | Santa Ana | CA | — | ◇ UNVERIFIED |
| OIOregon Iron Works Hidden Way | Vancouver | WA | — | ◇ UNVERIFIED |
| OIOregon Iron Works INC 3001 | Vancouver | WA | — | ◇ UNVERIFIED |
| OFOrganic Filling Solutions LLC | Chatsworth | CA | — | ◇ UNVERIFIED |
| OCOrg Chem Group LLC | Evansville | IN | — | ◇ UNVERIFIED |
| OIOrion Industries Auburn | Auburn | WA | — | ◇ UNVERIFIED |
| OIOrion Industries & Related Entities | Chicago | IL | — | ◇ UNVERIFIED |
| OMOrion Marine Construction, INC | Tampa | FL | — | ◇ UNVERIFIED |
| OMOrnamental Metalworks INC | Decatur | IL | — | ◇ UNVERIFIED |
| OOrtech | Kirksville | MO | — | ◇ UNVERIFIED |
| OSOsf St James Hospital | Pontiac | IL | — | ◇ UNVERIFIED |
| OSOsram Sylvania | Ipswich | MA | — | ◇ UNVERIFIED |
| OSOsram Sylvania INC | Wellsboro | PA | — | ◇ UNVERIFIED |
| OSOsram Sylvania Precision Materials & Components | Central Falls | RI | — | ◇ UNVERIFIED |
| OSOsram Sylvania Products INC | Exeter | NH | — | ◇ UNVERIFIED |
| OEOster Enterprises INC | Lemont | IL | — | ◇ UNVERIFIED |
| OSOtten Screw Products Co-otten Screw Products CO | Saint Louis | MO | — | ◇ UNVERIFIED |
| OSOutland Steel, INC. | Caldwell | ID | — | ◇ UNVERIFIED |
| OCOutlaw Customs - 16 Lincoln St, Dover | Dover | DE | — | ◇ UNVERIFIED |
| OCOverdale CORP | Alsip | IL | — | ◇ UNVERIFIED |
| OBOwen Biosciences INC | Baton Rouge | LA | — | ◇ UNVERIFIED |
| OMOwen Manufacturing INC | Owen | WI | — | ◇ UNVERIFIED |
| OGOwens-brockway Glass Containers INC | Godfrey | IL | — | ◇ UNVERIFIED |
| OCOwens Corning Reinforcement Solutions, LLC | Concord | NC | — | ◇ UNVERIFIED |
| OWO W Hubbell & Sons | New York Mills | NY | — | ◇ UNVERIFIED |
| OMOxford Manufacturing, LLC | Selma | AL | — | ◇ UNVERIFIED |
| OCOxy-dry CORP | Arlington Heights | IL | — | ◇ UNVERIFIED |
| OMOzark Mountain Concepts | Rogersville | MO | — | ◇ UNVERIFIED |
| OSOzark Steel Fabricators INC | Farmington | MO | — | ◇ UNVERIFIED |
| OBOzinga Bros INC | Chicago | IL | — | ◇ UNVERIFIED |
| PSPabrico Steel Fabricators | Paterson | NJ | — | ◇ UNVERIFIED |
| PIPacal Industries LLC | La Crosse | WI | — | ◇ UNVERIFIED |
| PWPaccar Winch INC / Broken Arrow Winch Hoist Manufacturing | Broken Arrow | OK | — | ◇ UNVERIFIED |
