| OVOak Valley Hardwoods/woodlawn | Marion | NC | — | ◇ UNVERIFIED |
| 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 |
| OTO'day Tank and Steel Company | Fargo | ND | — | ◇ UNVERIFIED |
| OFOem Fabricators INC | Neillsville | WI | — | ◇ UNVERIFIED |
| OAOgb Architectural Millwork, INC. | Albuquerque | NM | — | ◇ UNVERIFIED |
| OCOglivie Company INC the | Astoria | OR | — | ◇ UNVERIFIED |
| OSOhio Steel Industries | Pataskala | OH | — | ◇ UNVERIFIED |
| OOhmstede | La Porte | TX | — | ◇ UNVERIFIED |
| OSOil States Lampasas | Lampasas | TX | — | ◇ UNVERIFIED |
| OEOmega Engineering INC | Bridgeport | NJ | — | ◇ UNVERIFIED |
| ONOmega Natchiq New Iberia Facility | New Iberia | LA | — | ◇ UNVERIFIED |
| OPOmni Products INC | Mchenry | IL | — | ◇ UNVERIFIED |
| OSO'neal Steel INC | Houston | TX | — | ◇ UNVERIFIED |
| OSO'neal Steel, INC. | Indianapolis | IN | — | ◇ UNVERIFIED |
| OSO'neal Steel INC I | Greensboro | NC | — | ◇ UNVERIFIED |
| OSOne Source Systems LLC | Vicksburg | MS | — | ◇ UNVERIFIED |
| OLOpen Loop Energy - Nichols Facility | Safford | AZ | — | ◇ UNVERIFIED |
| OSOrange State Steel Construction, INC | Pinellas Park | FL | — | ◇ UNVERIFIED |
| OMOrchard Machinery Corporation | Yuba City | CA | — | ◇ UNVERIFIED |
| OOOrchid Orthopedics | Arcadia | CA | — | ◇ UNVERIFIED |
| OOOrchid Orthopedics Solutions | Santa Ana | CA | — | ◇ UNVERIFIED |
| OAOregon Aero | Salem | OR | — | ◇ UNVERIFIED |
| OIOregon Iron Works Hidden Way | Vancouver | WA | — | ◇ UNVERIFIED |
| OIOregon Iron Works INC 3001 | Vancouver | WA | — | ◇ UNVERIFIED |
| OMOrion Marine Construction, INC | Tampa | FL | — | ◇ UNVERIFIED |
| OMOrnamental Metalworks INC | Decatur | IL | — | ◇ 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 |
| OIOxbo International CORP | Lynden | WA | — | ◇ UNVERIFIED |
| OMOxford Manufacturing, LLC | Selma | AL | — | ◇ UNVERIFIED |
| OSOzark Steel Fabricators INC | Farmington | MO | — | ◇ 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 |
| PMPacific Mdf Products | Rocklin | CA | — | ◇ UNVERIFIED |
| PMPacific Metal Stampings INC | Valencia | CA | — | ◇ UNVERIFIED |
| POPacific Office Automation | Seattle | WA | — | ◇ UNVERIFIED |
| PSPackaging Systems International | Denver | CO | — | ◇ UNVERIFIED |
| POPaddock of California | Rock Hill | SC | — | ◇ UNVERIFIED |
| PMPadnos Manufacturing INC | Grand Rapids | MI | — | ◇ UNVERIFIED |
| PMPalfinger Marine USA INC | Portsmouth | VA | — | ◇ UNVERIFIED |
| PAPall Aeropower CORP Fort Myers | Fort Myers | FL | — | ◇ UNVERIFIED |
| PMPalmer Mfg. & Tank, INC. | Dickinson | ND | — | ◇ UNVERIFIED |
| PWPampa Wind Tower Manufacturing Facility | Pampa | TX | — | ◇ UNVERIFIED |
| PUPandrol USA LP | Bridgeport | NJ | — | ◇ UNVERIFIED |
| PWPaone Woodworking CORP | Philadelphia | PA | — | ◇ UNVERIFIED |
| PMParagon Machine Company, INC. | Saint Petersburg | FL | — | ◇ UNVERIFIED |
| PMParamount Manufacturing CO 445 | Long Beach | CA | — | ◇ UNVERIFIED |
| PHParker Hannifin - Airtek | Lancaster | NY | — | ◇ UNVERIFIED |
| PHParker Hannifin CORP | Lithia Springs | GA | — | ◇ UNVERIFIED |
| PHParker Hannifin CORP Hpd | Marysville | OH | — | ◇ UNVERIFIED |
| PPParkland Plastics, INC. | Middlebury | IN | — | ◇ UNVERIFIED |
| PPPar Products | Wylie | TX | — | ◇ UNVERIFIED |
| PPParton & Preble INC | Warren | MI | — | ◇ UNVERIFIED |
| PFPasadena Fabrication Facility | Pasadena | TX | — | ◇ UNVERIFIED |
| PJPaterson James M | Totowa | NJ | — | ◇ UNVERIFIED |
| PEPatrick Enterprises Corporation | Pembroke | VA | — | ◇ UNVERIFIED |
| PBPaul B Zimmerman INC | Lititz | PA | — | ◇ UNVERIFIED |
| PEPayne Engineering & Fabrications | Canton | MA | — | ◇ UNVERIFIED |
| PCPcc Composites | Frederick | CO | — | ◇ UNVERIFIED |
| PCPcc Composites.cn | Longmont | CO | — | ◇ UNVERIFIED |
| PQP&c Quality Turned Components | Smithfield | RI | — | ◇ UNVERIFIED |
| PPPdm Precast | Carlisle | IA | — | ◇ UNVERIFIED |
| PLPdp LLC | Chattanooga | TN | — | ◇ UNVERIFIED |
| PWPeachey Wood Products | Reedsville | PA | — | ◇ UNVERIFIED |
| PTPeacock Tool & Engineering | Spring Valley | CA | — | ◇ UNVERIFIED |
| PIPearlworks INC | Tustin | CA | — | ◇ UNVERIFIED |
| PEPeavey Electronics Corporation, Plant Number 5 | Meridian | MS | — | ◇ UNVERIFIED |
| PEP E Barnes CO INC | Hamburg | AR | — | ◇ UNVERIFIED |
| PMPeck Manufacturing CO | Herman | NE | — | ◇ UNVERIFIED |
| PEPeerless Energy Systems | Omaha | NE | — | ◇ UNVERIFIED |
| PTPeerless Tube CO INC | Bloomfield | NJ | — | ◇ UNVERIFIED |
| PWPeerless Woodworking CORP | Bristol | TN | — | ◇ UNVERIFIED |
| PMPelican Metal Products LLC | Harrison Township | MI | — | ◇ UNVERIFIED |
| PKPelletizer Knives | Houston | TX | — | ◇ UNVERIFIED |
| PIPemco INC | Pascagoula | MS | — | ◇ UNVERIFIED |
| PTPems Tool & Machine INC | Little Falls | NY | — | ◇ UNVERIFIED |
 Penco Products INC | Hamilton | NC | — | ◇ UNVERIFIED |
| PDPennsylvania Drilling Company | Woodstock | VA | — | ◇ UNVERIFIED |
| PEPentair Electronic Packaging | Warwick | RI | — | ◇ UNVERIFIED |
| PTPentair Technical Solutions | Mount Sterling | KY | — | ◇ UNVERIFIED |
| PPPenz Products, INC. | Mishawaka | IN | — | ◇ UNVERIFIED |
| PNPeoples Natural Gas CO Llc/gibson Sta | Charleroi | PA | — | ◇ UNVERIFIED |
| PAPerfect Air Control LLC / Metal Industries LLC of Nc | Marion | NC | — | ◇ UNVERIFIED |
| PEPerformance Energy Services LLC - Amelia Yard | Morgan City | LA | — | ◇ UNVERIFIED |
| PSPerformance Structures, INC. | Oakland | CA | — | ◇ UNVERIFIED |
| PIPergo, INC. | Garner | NC | — | ◇ UNVERIFIED |
| PMPerkins Machine CO | Warren | MA | — | ◇ UNVERIFIED |
| PNPermasteelisa North America | Harrison | NJ | — | ◇ UNVERIFIED |
| PTPermian Tank and Manufacturing INC / El Reno Manufacturing Plant | El Reno | OK | — | ◇ UNVERIFIED |
| PIPetersen INC | Pocatello | ID | — | ◇ UNVERIFIED |
| PIPetersen Industries, INC. | Lake Wales | FL | — | ◇ UNVERIFIED |
| PMPetersen Metals | Hudson | FL | — | ◇ UNVERIFIED |
