| OSOld School Industries INC | Dacono | CO | — | ◇ UNVERIFIED |
| OSOld South Ironworks INC | Gray | TN | — | ◇ UNVERIFIED |
| OWOld World Iron | Gilroy | CA | — | ◇ UNVERIFIED |
| OSOlins Sheet Metal, INC. | Albany | GA | — | ◇ UNVERIFIED |
| OOOliver's Ornamental Iron, LLC | Flora | MS | — | ◇ UNVERIFIED |
| OIOlson Industries, INC. | Atkinson | NE | — | ◇ UNVERIFIED |
| OIOlson Iron & Stone Creations LLC | Elk River | MN | — | ◇ UNVERIFIED |
| OOmco | Talladega | AL | — | ◇ UNVERIFIED |
| OCOmega Consolidated Corporation | Hilton | NY | — | ◇ UNVERIFIED |
| OMOmega Machine & Tool, INC. | Mentor | OH | — | ◇ UNVERIFIED |
| OTOmega Tool CO | Saint Louis | MO | — | ◇ UNVERIFIED |
| OIOmg, INC. Dba Hickman Engineered Systems | Arden | NC | — | ◇ UNVERIFIED |
| OMOm Machine & Tool LLC | Portland | OR | — | ◇ UNVERIFIED |
| OOmniduct | Everett | WA | — | ◇ UNVERIFIED |
| OAOmniduct Arlington | Arlington | WA | — | ◇ UNVERIFIED |
| OAOmniduct Az, LLC | Phoenix | AZ | — | ◇ UNVERIFIED |
| OOmnimax | Gridley | IL | — | ◇ UNVERIFIED |
| OIOmnimax International, INC. | Ivyland | PA | — | ◇ UNVERIFIED |
| OIOmnimax International, LLC Dba Millennium Metals | Jacksonville | FL | — | ◇ UNVERIFIED |
| OMOmni Measurement Systems | Winooski | VT | — | ◇ UNVERIFIED |
| OPOmni Precision | Houston | TX | — | ◇ UNVERIFIED |
| OPOmni Precision, INC. | Houston | TX | — | ◇ UNVERIFIED |
| ODOn Demand Edm INC | Blaine | MN | — | ◇ UNVERIFIED |
| OEOne Ez Post LLC | Kingsport | TN | — | ◇ UNVERIFIED |
| OTOneida Tool Corporation | Redford | MI | — | ◇ UNVERIFIED |
| OMOneto Metal Products CORP | Sacramento | CA | — | ◇ UNVERIFIED |
| OTOne Ton Welding, Inc. | Panama | IA | — | ◇ UNVERIFIED |
| OAOnex Automation | Duarte | CA | — | ◇ UNVERIFIED |
| OSOney Sheetmetal INC | Fort Myers | FL | — | ◇ UNVERIFIED |
| OFOnGuard Fence Systems, Ltd. | Moorestown | NJ | — | ◇ UNVERIFIED |
| OCOnsite Calibartion Service INC | Louisville | KY | — | ◇ UNVERIFIED |
| OSOn Spot Portable Machine CO INC | Livonia | MI | — | ◇ UNVERIFIED |
 On The Edge MFG, Inc | Kittanning | PA | — | ◇ UNVERIFIED |
| OTOn the Mean, Machine, LLC | Grand Rapids | OH | — | ◇ UNVERIFIED |
| OFOostman Fabricating & Welding, INC. | Westmont | IL | — | ◇ UNVERIFIED |
| OOOpEx OpCo Inc. | Minneapolis | MN | — | ◇ UNVERIFIED |
| OIOPMP, Inc. | Tracy | CA | — | ◇ UNVERIFIED |
| OPOptima Precision, Inc. | San Jose | CA | — | ◇ UNVERIFIED |
| OPOptimum Parts Company | Holyoke | MA | — | ◇ UNVERIFIED |
| OSOrange Steel Roofing Products | Orange | VA | — | ◇ UNVERIFIED |
| OIOregon Industrial Repair INC | Salem | OR | — | ◇ UNVERIFIED |
| OMOregon Machine Works, INC. | Canby | OR | — | ◇ UNVERIFIED |
| OSOreland Sheet Metal Inc | Huntingdon Valley | PA | — | ◇ UNVERIFIED |
| OEOri Enterprises LLC | Price | UT | — | ◇ UNVERIFIED |
| OEOriginal Exhaust Manufacturers INC | Hopkinsville | KY | — | ◇ UNVERIFIED |
| OPOrion Properties Group LLC | New Prague | MN | — | ◇ UNVERIFIED |
| OIOrluck Industries INC | Otsego | MN | — | ◇ UNVERIFIED |
| ODOrnalux Design Company, INC. | Oakland | CA | — | ◇ UNVERIFIED |
| ODOrnamental Design Inc | Tampa | FL | — | ◇ UNVERIFIED |
| OIOrnamental Iron Concept,bartolome Fluxa | Van Nuys | CA | — | ◇ UNVERIFIED |
| OIOrnamental Ironworks | Los Angeles | CA | — | ◇ UNVERIFIED |
| OCOrrbilt Compressors, INC. | Atlanta | GA | — | ◇ UNVERIFIED |
| ODOscar Diaz Rivera | San Juan | PR | — | ◇ UNVERIFIED |
| OMOscar Macias and Sandra L. Macias | Gilroy | CA | — | ◇ UNVERIFIED |
| OMO&S Machine Shop, LLC | Latrobe | PA | — | ◇ UNVERIFIED |
| OOOsuna Ornamental LLC | Miami | FL | — | ◇ UNVERIFIED |
| OCOsynergy Company, LLC | Edinburg | TX | — | ◇ UNVERIFIED |
| OTOutlook Tool, Inc. | Dayton | OH | — | ◇ UNVERIFIED |
| OTOutlook Tool, Inc. | Dayton | OH | — | ◇ UNVERIFIED |
| OUOver Under Real Estate, LLC | Riverton | NJ | — | ◇ UNVERIFIED |
| OMOviso Mfg | Fremont | CA | — | ◇ UNVERIFIED |
| OMOwens Machine & Manufacturing | Abilene | TX | — | ◇ UNVERIFIED |
| OPOwens Precision | Carson City | NV | — | ◇ UNVERIFIED |
| OPOwens Precision, INC. | Mound House | NV | — | ◇ UNVERIFIED |
| PPPablo Precision | Oakland Park | FL | — | ◇ UNVERIFIED |
| PSPacesetter Safety, Inc. | Santa Clarita | CA | — | ◇ UNVERIFIED |
| PAPacific Air Cargo Transfer Systems, Inc | Auburn | WA | — | ◇ UNVERIFIED |
| PDPacific Duct INC | Montclair | CA | — | ◇ UNVERIFIED |
| PMPacific Metal Fab LLC | Eugene | OR | — | ◇ UNVERIFIED |
| PMPacific Metal Fabricators | Stockton | CA | — | ◇ UNVERIFIED |
| PMPacific Metal Works INC | Beaverton | OR | — | ◇ UNVERIFIED |
| PSPacific Swiss & Manufacturing, Inc. | Tempe | AZ | — | ◇ UNVERIFIED |
| PTPacific Tank & Energy LLC | Arlington | WA | — | ◇ UNVERIFIED |
| PTPacific Tool, Inc. | Redmond | WA | — | ◇ UNVERIFIED |
| PWPacific Waterjet Cutting INC | Chico | CA | — | ◇ UNVERIFIED |
| PWPacific Welding Services | Asan | GU | — | ◇ UNVERIFIED |
| POPackage One, INC. | Schenectady | NY | — | ◇ UNVERIFIED |
| PDPackaging Dynamics LTD | Bohemia | NY | — | ◇ UNVERIFIED |
| PTPac Tec, LLC | Milton | WI | — | ◇ UNVERIFIED |
| PFPainted Feather Precision LLC | Ramsey | MN | — | ◇ UNVERIFIED |
| PMPaladin Manufacturing LLP | Marietta | OK | — | ◇ UNVERIFIED |
| PSPalatka Sheet Metal, INC. | Palatka | FL | — | ◇ UNVERIFIED |
| PPPalese Proto Tech, INC. | Tucson | AZ | — | ◇ UNVERIFIED |
| PMPalex Metals INC | Santa Clara | CA | — | ◇ UNVERIFIED |
| PMPalladino Metal Fabrication, INC. | Pottstown | PA | — | ◇ UNVERIFIED |
| PBPalm Beach Iron Works, INC. | West Palm Beach | FL | — | ◇ UNVERIFIED |
| PMPalmer Mfg. & Tank, Inc.-palm | Dickinson | ND | — | ◇ UNVERIFIED |
| POPalmer of Texas | Loco Hills | NM | — | ◇ UNVERIFIED |
| PTPalmer Tank & Construction, INC. | Bakersfield | CA | — | ◇ UNVERIFIED |
| PTPalmer Tool Company | Camden | TN | — | ◇ UNVERIFIED |
| PSPalmetto Southern INC | Lexington | SC | — | ◇ UNVERIFIED |
| PMPals Machining INC | Owatonna | MN | — | ◇ UNVERIFIED |
| PMPamco Machine Works INC | Rancho Cucamonga | CA | — | ◇ UNVERIFIED |
| PIPamlar INC | Ojai | CA | — | ◇ UNVERIFIED |
| PAP and J Precision Machine LLC | Chelmsford | MA | — | ◇ UNVERIFIED |
| PPPanhandle Packing & Gasket, Inc. | Lubbock | TX | — | ◇ UNVERIFIED |
| PMPan Man, LLC | Lake Worth Beach | FL | — | ◇ UNVERIFIED |
| PMPan Metal Corporation | Los Angeles | CA | — | ◇ UNVERIFIED |
| PIParadox Intellectual Properties, INC. | Chiefland | FL | — | ◇ UNVERIFIED |
| PMParagon Metal Fabrication, LLC | Bozeman | MT | — | ◇ UNVERIFIED |
