| OFOberlin Filter Company | Pewaukee | WI | — | ◇ UNVERIFIED |
| OCObie Construction, INC. | Eugene | OR | — | ◇ UNVERIFIED |
| OBO B I Linings | Chocowinity | NC | — | ◇ UNVERIFIED |
| OIOcci INC. Wwtp | Fulton | MO | — | ◇ UNVERIFIED |
| OSOcean Steel CORP | Conklin | NY | — | ◇ UNVERIFIED |
| OCOctober CO Chemetal Division | Easthampton | MA | — | ◇ UNVERIFIED |
| OCOcv Control Valves Precision Coatings / Ocv Control Valves Precision Coatings | Tulsa | OK | — | ◇ UNVERIFIED |
| OTO'day Tank and Steel Company | Fargo | ND | — | ◇ UNVERIFIED |
| OIOddello Industries, LLC | Morristown | TN | — | ◇ UNVERIFIED |
| OTOdm Tool & Manufacturing CO | Mccook | IL | — | ◇ 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 |
| OIOfs International Houston Plant | Houston | TX | — | ◇ UNVERIFIED |
| OCOgden Chrome Plating & Bumper Exchange | Ogden | UT | — | ◇ UNVERIFIED |
| OCOglivie Company INC the | Astoria | OR | — | ◇ UNVERIFIED |
| OSOhio Steel Industries | Pataskala | OH | — | ◇ UNVERIFIED |
| OOhmstede | La Porte | TX | — | ◇ UNVERIFIED |
| OIO'keeffe's INC. | Merced | CA | — | ◇ UNVERIFIED |
| OCOld Country Millwork INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| OVOlive View Medical Center La County | Sylmar | CA | — | ◇ UNVERIFIED |
| OEOlson Engineering | Saint James | MN | — | ◇ UNVERIFIED |
| OSOlympic Steel - Ps&w | Siler City | NC | — | ◇ UNVERIFIED |
| OAOmaha Antique & Job Plating CO | Omaha | NE | — | ◇ UNVERIFIED |
| OCOmco Cast Metals, INC. | Winchester | IN | — | ◇ UNVERIFIED |
| OEOmega Engineering INC | Bridgeport | NJ | — | ◇ UNVERIFIED |
| ONOmega Natchiq New Iberia Facility | New Iberia | LA | — | ◇ UNVERIFIED |
| OMOmni Metals CO INC | Somersworth | NH | — | ◇ UNVERIFIED |
| OSO'neal Steel INC | Houston | TX | — | ◇ UNVERIFIED |
| OSO'neal Steel, INC. | Indianapolis | IN | — | ◇ UNVERIFIED |
| OSO'neal Steel INC I | Greensboro | NC | — | ◇ UNVERIFIED |
| OMOne More Part Dba Omp | Longmont | CO | — | ◇ UNVERIFIED |
| OSOne Source Systems LLC | Vicksburg | MS | — | ◇ UNVERIFIED |
| OLOpen Loop Energy Dba Sjs Machine Shop | Farmington | NM | — | ◇ UNVERIFIED |
| OLOpen Loop Energy - Nichols Facility | Safford | AZ | — | ◇ UNVERIFIED |
| OCOptical Components | Covina | CA | — | ◇ UNVERIFIED |
| OSOptimas Solutions | Wood Dale | IL | — | ◇ UNVERIFIED |
| OCOrange County Metal Processing | Fullerton | CA | — | ◇ UNVERIFIED |
| OSOrange State Steel Construction, INC | Pinellas Park | FL | — | ◇ UNVERIFIED |
| OCOrbel CORP | Phillipsburg | NJ | — | ◇ UNVERIFIED |
| OMOrchard Machinery Corporation | Yuba City | CA | — | ◇ UNVERIFIED |
| OOOrchid Orthopedics | Arcadia | CA | — | ◇ UNVERIFIED |
| OOOrchid Orthopedics Solutions | Santa Ana | CA | — | ◇ UNVERIFIED |
| OIOregon Iron Works Hidden Way | Vancouver | WA | — | ◇ UNVERIFIED |
| OIOregon Iron Works INC 3001 | Vancouver | WA | — | ◇ UNVERIFIED |
| OPOregon Plating Co., INC. | Portland | OR | — | ◇ UNVERIFIED |
| OIOrion Industries Auburn | Auburn | WA | — | ◇ UNVERIFIED |
| OIOrion Industries & Related Entities | Chicago | IL | — | ◇ UNVERIFIED |
| OMOrion Marine Construction, INC | Tampa | FL | — | ◇ UNVERIFIED |
| ODOrlando Drum and Container CORP | Orlando | FL | — | ◇ UNVERIFIED |
| OMOrnamental Metalworks INC | Decatur | IL | — | ◇ UNVERIFIED |
| OPOshkosh Plating Technologies INC | Oshkosh | WI | — | ◇ UNVERIFIED |
| OTOtis Technology INC | Lyons Falls | NY | — | ◇ UNVERIFIED |
| OSOtten Screw Products Co-otten Screw Products CO | Saint Louis | MO | — | ◇ UNVERIFIED |
| OSOutland Steel, INC. | Caldwell | ID | — | ◇ UNVERIFIED |
| OGOwens-brockway Glass Containers INC | Godfrey | IL | — | ◇ UNVERIFIED |
| OPOwens Plating CO | Rainbow City | AL | — | ◇ UNVERIFIED |
| OWO W Hubbell & Sons | New York Mills | NY | — | ◇ UNVERIFIED |
| OIOxbo International CORP | Lynden | WA | — | ◇ UNVERIFIED |
| OMOxford Manufacturing, LLC | Selma | AL | — | ◇ UNVERIFIED |
| OPOxford Plating CO. INC. | Oxford | AL | — | ◇ UNVERIFIED |
| ODOzark Die Casting | Saint Clair | MO | — | ◇ UNVERIFIED |
| OMOzark Mountain Concepts | Rogersville | MO | — | ◇ UNVERIFIED |
| OSOzark Steel Fabricators INC | Farmington | MO | — | ◇ UNVERIFIED |
| OGO-z Gedney | Brooklyn | NY | — | ◇ UNVERIFIED |
| PSPabrico Steel Fabricators | Paterson | NJ | — | ◇ UNVERIFIED |
| PIPacal Industries LLC | La Crosse | WI | — | ◇ UNVERIFIED |
| PLPacal LLC | Roseville | MN | — | ◇ UNVERIFIED |
| PWPaccar Winch INC / Broken Arrow Winch Hoist Manufacturing | Broken Arrow | OK | — | ◇ UNVERIFIED |
| PAPacific Award Metals INC | Baldwin Park | CA | — | ◇ UNVERIFIED |
| PCPacific Chrome Services | Santa Ana | CA | — | ◇ UNVERIFIED |
| PCPacific Coast Anodizing INC | Fresno | CA | — | ◇ UNVERIFIED |
| PIPacific Industrial Supply Director St | Seattle | WA | — | ◇ UNVERIFIED |
| PMPacific Metal Stampings INC | Valencia | CA | — | ◇ UNVERIFIED |
| PNPacific Northwest Plating | Vancouver | WA | — | ◇ UNVERIFIED |
| POPacific Office Automation | Seattle | WA | — | ◇ UNVERIFIED |
| PSPacific Steel Treating CO Incorporated | N Hollywood | CA | — | ◇ UNVERIFIED |
| PTPacific Truck Centers | Ridgefield | WA | — | ◇ UNVERIFIED |
| POPact One Llc/ W Norriton Twp | Trooper | PA | — | ◇ UNVERIFIED |
| POPaddock of California | Rock Hill | SC | — | ◇ UNVERIFIED |
| PMPadnos Manufacturing INC | Grand Rapids | MI | — | ◇ UNVERIFIED |
| PIPainting INC | South Hackensack | NJ | — | ◇ UNVERIFIED |
| PIPaint-line INC | Fairfield | IA | — | ◇ UNVERIFIED |
| PMPalfinger Marine USA INC | Portsmouth | VA | — | ◇ UNVERIFIED |
| PAPall Aeropower CORP Fort Myers | Fort Myers | FL | — | ◇ UNVERIFIED |
| PMPalmer Mfg. & Tank, INC. | Dickinson | ND | — | ◇ UNVERIFIED |
| PPPalmetto Plating Company | Easley | SC | — | ◇ UNVERIFIED |
| PWPalmyra Water Plant | Palmyra | MO | — | ◇ UNVERIFIED |
| PGPamarco Global Graphics | Walton | KY | — | ◇ UNVERIFIED |
| PWPampa Wind Tower Manufacturing Facility | Pampa | TX | — | ◇ UNVERIFIED |
| PUPandrol USA LP | Bridgeport | NJ | — | ◇ UNVERIFIED |
| PGPan Glo | Worcester | MA | — | ◇ UNVERIFIED |
| PPPapago Plating | Phoenix | AZ | — | ◇ UNVERIFIED |
| PPPaper People, LLC | Vancouver | WA | — | ◇ UNVERIFIED |
| PMParagon Machine Company, INC. | Saint Petersburg | FL | — | ◇ UNVERIFIED |
| PMParagon Metal Fabrication | Cincinnati | OH | — | ◇ UNVERIFIED |
| PSParagon Services Inc-sheridan Facility | Wichita | KS | — | ◇ UNVERIFIED |
