| OIOmni Industrial Services | Buffalo | WV | — | ◇ UNVERIFIED |
| OOmnimax | Gridley | IL | — | ◇ UNVERIFIED |
| OIOmnimax International, INC. | Ivyland | PA | — | ◇ UNVERIFIED |
| OIOmnimax International, LLC Dba Millennium Metals | Jacksonville | FL | — | ◇ UNVERIFIED |
 Omni Services | Falconer | NY | — | ◇ UNVERIFIED |
| OPOn-board Pmo, Corporation | Valley View | OH | — | ◇ UNVERIFIED |
| OMO'neal Manufacturing Services | Indianapolis | IN | — | ◇ UNVERIFIED |
| OMO'neal Manufacturing Services | Cedar Falls | IA | — | ◇ UNVERIFIED |
| OROne Rig Design LLC | Poland | ME | — | ◇ UNVERIFIED |
| OSOne Source Systems LLC | Vicksburg | MS | — | ◇ UNVERIFIED |
| OMOneto Metal Products CORP | Sacramento | CA | — | ◇ UNVERIFIED |
| OSOney Sheetmetal INC | Fort Myers | FL | — | ◇ UNVERIFIED |
| OCOn-site Custom Fabrication INC. | Hendersonville | TN | — | ◇ UNVERIFIED |
 On The Edge MFG, Inc | Kittanning | PA | — | ◇ UNVERIFIED |
| OTOn the Level Fabrication, LLC | Winder | GA | — | ◇ UNVERIFIED |
| OTOn Time Fab INC | Saint Joseph | KY | — | ◇ UNVERIFIED |
| OFOpc Fabrication and Equipment, INC. (fn) | Phoenix | AZ | — | ◇ UNVERIFIED |
| OTOp Tanks LLC | Pleasant View | UT | — | ◇ UNVERIFIED |
| OSOrange State Steel | Bartow | FL | — | ◇ UNVERIFIED |
| OSOrange State Steel Construction, INC | Pinellas Park | FL | — | ◇ UNVERIFIED |
| OSOrange State Steel Construction, INC. | Riverview | FL | — | ◇ UNVERIFIED |
| OSOrange Steel Roofing Products | Orange | VA | — | ◇ UNVERIFIED |
| OCOrco Construction Supply | Bloomington | CA | — | ◇ UNVERIFIED |
| ODOreco Duct System INC | Baldwin Park | CA | — | ◇ UNVERIFIED |
| OIOregon Iron Works Hidden Way | Vancouver | WA | — | ◇ UNVERIFIED |
| OIOregon Iron Works INC 3001 | Vancouver | WA | — | ◇ UNVERIFIED |
| OPOregon Pacific Structural Fabrication, LLC | Mulino | OR | — | ◇ UNVERIFIED |
| OPOregon Precision Manufacturing INC | Sherwood | OR | — | ◇ UNVERIFIED |
| OSOreland Sheet Metal Inc | Huntingdon Valley | PA | — | ◇ UNVERIFIED |
| OTOrganic Transit INC. | Durham | NC | — | ◇ UNVERIFIED |
| OEOri Enterprises LLC | Wellington | UT | — | ◇ UNVERIFIED |
| OAOrion Asset Management Co., LLC | Akron | OH | — | ◇ UNVERIFIED |
| OEOrion Enterprises INC | Kansas City | KS | — | ◇ UNVERIFIED |
| OMOrion Marine Construction, INC | Tampa | FL | — | ◇ UNVERIFIED |
| OIOrlando Iron Works | Paterson | NJ | — | ◇ UNVERIFIED |
| OMOrnamental Metalworks INC | Decatur | IL | — | ◇ UNVERIFIED |
| OCOsage Canoes LLC | Lebanon | MO | — | ◇ UNVERIFIED |
| OWOsborne Welding, INC. | Hampton | VA | — | ◇ UNVERIFIED |
| OIOseda Industries Corporation | Corona | CA | — | ◇ UNVERIFIED |
| OAOshkosh Aerotech - Jetway Systems | Ogden | UT | — | ◇ UNVERIFIED |
| OIOssi's Iron Works | Las Vegas | NV | — | ◇ UNVERIFIED |
| ONOur Next Energy | Torrance | CA | — | ◇ UNVERIFIED |
| OSOutland Steel, INC. | Caldwell | ID | — | ◇ UNVERIFIED |
| OIOutlaw Industries, LLC | Clinton | LA | — | ◇ UNVERIFIED |
| OGOwens-brockway Glass Containers INC | Godfrey | IL | — | ◇ UNVERIFIED |
| OSOwens & Sons, INC. | Metairie | LA | — | ◇ UNVERIFIED |
| OSOwens Specialty Company, INC. | Channelview | TX | — | ◇ UNVERIFIED |
| OWO W Hubbell & Sons | New York Mills | NY | — | ◇ UNVERIFIED |
| OGOxford General Industries INC | Prospect | CT | — | ◇ UNVERIFIED |
| OMOxford Manufacturing, LLC | Selma | AL | — | ◇ UNVERIFIED |
| OBOzark Barge & Dock Service Inc.* | Gravois Mills | MO | — | ◇ UNVERIFIED |
| PMP3 Manufacturing LLC | Cleveland | OH | — | ◇ UNVERIFIED |
| PIPacal Industries LLC | La Crosse | WI | — | ◇ UNVERIFIED |
| PSPacfab Services LLC | Davenport | IA | — | ◇ UNVERIFIED |
| PAPacific Award Metals INC | Baldwin Park | CA | — | ◇ UNVERIFIED |
| PDPacific Duct INC | Montclair | CA | — | ◇ UNVERIFIED |
| PEPacific Embedment Products | Adelanto | CA | — | ◇ UNVERIFIED |
| PFPacific Fabrication INC | Rancho Cucamonga | CA | — | ◇ UNVERIFIED |
| PFPacific Fiberglass INC | Salem | OR | — | ◇ UNVERIFIED |
| PMPacific Metal Fab, INC | Madera | CA | — | ◇ UNVERIFIED |
| PMPacific Metal Fab LLC | Eugene | OR | — | ◇ UNVERIFIED |
| PMPacific Metal Fabricators | Stockton | CA | — | ◇ UNVERIFIED |
| POPacific Office Automation | Seattle | WA | — | ◇ UNVERIFIED |
| PPPacific Powder Coating & Manufacturing | Sacramento | CA | — | ◇ UNVERIFIED |
| PRPacific Rebar INC | Ontario | CA | — | ◇ UNVERIFIED |
| PSPacific Safe Manufacturing, Inc. | Upland | CA | — | ◇ UNVERIFIED |
| PSPacific Steel Group | Napa | CA | — | ◇ UNVERIFIED |
| PSPacific Steel Group | Benicia | CA | — | ◇ UNVERIFIED |
| PSPacific Steel Group | Bloomington | CA | — | ◇ UNVERIFIED |
| PSPacific Steel Group | Bloomington | CA | — | ◇ UNVERIFIED |
| PSPacific Steel Group | Stockton | CA | — | ◇ UNVERIFIED |
| PSPacific Steel Group | Livermore | CA | — | ◇ UNVERIFIED |
| PWPacific Welding Services | Asan | GU | — | ◇ UNVERIFIED |
| POPact One Llc/ W Norriton Twp | Trooper | PA | — | ◇ UNVERIFIED |
| PIPageantry Innovations LLC | Dover | OH | — | ◇ UNVERIFIED |
| PSPalatka Sheet Metal, INC. | Palatka | FL | — | ◇ UNVERIFIED |
| PMPalermo Metal Products, INC. | Easton | PA | — | ◇ UNVERIFIED |
| PMPalex Metals INC | Santa Clara | CA | — | ◇ UNVERIFIED |
| PMPalladino Metal Fabrication, INC. | Pottstown | PA | — | ◇ UNVERIFIED |
| PCPall Corporation | Grand Island | NE | — | ◇ UNVERIFIED |
| PTPalmer Tool Company | Camden | TN | — | ◇ UNVERIFIED |
| PDPamela Deats dba Custom Built Awards | Humble | TX | — | ◇ UNVERIFIED |
| PUPandrol USA LP | Bridgeport | NJ | — | ◇ UNVERIFIED |
| PFPanel Finishers, INC. | Houston | TX | — | ◇ UNVERIFIED |
| PMPanhandle Machine LLC | Priest River | ID | — | ◇ UNVERIFIED |
| PMPanhandle Metal Fabrication, INC. | Pensacola | FL | — | ◇ UNVERIFIED |
| PMPan Man, LLC | Lake Worth Beach | FL | — | ◇ UNVERIFIED |
| PIPAOK Industries LLC | Houston | TX | — | ◇ UNVERIFIED |
| PMParadigm Machine INC. | El Dorado | KS | — | ◇ UNVERIFIED |
| PSParadigm Steel Fabricators, INC. | Bakersfield | CA | — | ◇ UNVERIFIED |
| PCParagon CNC, LLC | Frederick | MD | — | ◇ UNVERIFIED |
| PMParagon Machine Company, INC. | Saint Petersburg | FL | — | ◇ UNVERIFIED |
| PPParagon Precision Metal, LLC | Mcpherson | KS | — | ◇ UNVERIFIED |
| PMParametric Manufacturing INC | Santa Clara | CA | — | ◇ UNVERIFIED |
| PAParamount Assets Group, LLC | Naples | FL | — | ◇ UNVERIFIED |
| PIParatus Industries | Buffalo | NY | — | ◇ UNVERIFIED |
| PSParcell Steel CORP | Fontana | CA | — | ◇ UNVERIFIED |
| PPParedes Properties LLC | Corona | CA | — | ◇ UNVERIFIED |
| PPParis Precision Products | Paso Robles | CA | — | ◇ UNVERIFIED |
| P2Park 295 Building C | Jacksonville | FL | — | ◇ UNVERIFIED |
