| OIOldcastle Infrastructure - Azusa 10th | Azusa | CA | — | ◇ UNVERIFIED |
| OIOldcastle Infrastructure - Azusa Dalou | Azusa | CA | — | ◇ UNVERIFIED |
| OPOlmsted Products CO. | Traverse City | MI | — | ◇ UNVERIFIED |
| OCOlson & Company Steel | Fresno | CA | — | ◇ UNVERIFIED |
| OSOlson Steel | San Leandro | CA | — | ◇ UNVERIFIED |
| OTOlympus Technologies Incorporated | Eugene | OR | — | ◇ UNVERIFIED |
| ONOmega Natchiq New Iberia Facility | New Iberia | LA | — | ◇ UNVERIFIED |
| OSOmega Steel Products, INC | Jemison | AL | — | ◇ UNVERIFIED |
| OMO & M Fabricators, LLC | Pensacola | FL | — | ◇ UNVERIFIED |
| OIOmni Industrial Services | Buffalo | WV | — | ◇ UNVERIFIED |
| OSOne Source Systems LLC | Vicksburg | MS | — | ◇ UNVERIFIED |
| OTOn Time Fab INC | Saint Joseph | KY | — | ◇ UNVERIFIED |
| OFOpc Fabrication and Equipment, INC. (fn) | Phoenix | AZ | — | ◇ UNVERIFIED |
 Optimum Controls Corporation | Reading | PA | — | ◇ UNVERIFIED |
| OSOrange State Steel | Bartow | FL | — | ◇ UNVERIFIED |
| OSOrange State Steel Construction, INC | Pinellas Park | FL | — | ◇ UNVERIFIED |
| OSOrange State Steel Construction, INC. | Riverview | FL | — | ◇ 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 |
| OTOrganic Transit INC. | Durham | NC | — | ◇ UNVERIFIED |
| OMOrion Marine Construction, INC | Tampa | FL | — | ◇ UNVERIFIED |
| OIOrlando Iron Works | Paterson | NJ | — | ◇ UNVERIFIED |
| OMOrnamental Metalworks INC | Decatur | IL | — | ◇ UNVERIFIED |
| OWOsborne Welding, INC. | Hampton | VA | — | ◇ UNVERIFIED |
| OAOshkosh Aerotech - Jetway Systems | Ogden | UT | — | ◇ UNVERIFIED |
| OIOssi's Iron Works | Las Vegas | NV | — | ◇ UNVERIFIED |
| OSOutland Steel, INC. | Caldwell | ID | — | ◇ UNVERIFIED |
| OIOutlaw Industries, LLC | Clinton | LA | — | ◇ UNVERIFIED |
| OSOwens & Sons, INC. | Metairie | LA | — | ◇ UNVERIFIED |
| OBOzark Barge & Dock Service Inc.* | Gravois Mills | MO | — | ◇ UNVERIFIED |
| PIPacal Industries LLC | La Crosse | WI | — | ◇ UNVERIFIED |
| PEPacific Electric | Yorba Linda | CA | — | ◇ UNVERIFIED |
| PEPacific Embedment Products | Adelanto | CA | — | ◇ UNVERIFIED |
| PFPacific Fabrication INC | Rancho Cucamonga | CA | — | ◇ UNVERIFIED |
| PPPacific Power System Integration INC | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| PRPacific Rebar INC | Ontario | CA | — | ◇ UNVERIFIED |
| PSPacific Steel Group | Benicia | CA | — | ◇ UNVERIFIED |
| PSPacific Steel Group | Bloomington | CA | — | ◇ UNVERIFIED |
| PSPacific Steel Group | Livermore | CA | — | ◇ UNVERIFIED |
| PSPacific Steel Group | Bloomington | CA | — | ◇ UNVERIFIED |
| PSPacific Steel Group | Stockton | CA | — | ◇ UNVERIFIED |
| PSPacific Steel Group | Napa | CA | — | ◇ UNVERIFIED |
| PWPacific Welding Services | Asan | GU | — | ◇ UNVERIFIED |
| PBPaint Booth | Houston | TX | — | ◇ UNVERIFIED |
| PAPall Aerospace | Pinellas Park | FL | — | ◇ UNVERIFIED |
| PAPanel Authority, INC. | Plainfield | IL | — | ◇ UNVERIFIED |
| PCPanelboy Controls LLC | Grand Rapids | MI | — | ◇ UNVERIFIED |
| PMPanhandle Machine LLC | Priest River | ID | — | ◇ UNVERIFIED |
| PMPanhandle Metal Fabrication, INC. | Pensacola | FL | — | ◇ UNVERIFIED |
| PIPAOK Industries LLC | Houston | TX | — | ◇ UNVERIFIED |
| PMParadigm Machine INC. | El Dorado | KS | — | ◇ UNVERIFIED |
| PSParadigm Steel Fabricators, INC. | Bakersfield | CA | — | ◇ UNVERIFIED |
| PSParcell Steel CORP | Fontana | CA | — | ◇ UNVERIFIED |
| PPParedes Properties LLC | Corona | CA | — | ◇ UNVERIFIED |
| PCParker-hannifin CORP. | Lincoln | NE | — | ◇ UNVERIFIED |
| PHParker Hannifin CORP Mobile Cylinder Div | Minneapolis | MN | — | ◇ UNVERIFIED |
| PHParker Hannifin Integrated Hydraulics Division | Lincolnshire | IL | — | ◇ UNVERIFIED |
| PHParker Hannifin /mobile Systems | Elk Grove Village | IL | — | ◇ UNVERIFIED |
| PPParker-hose Products Division | Mason | MI | — | ◇ UNVERIFIED |
| PSPark Steel Company INC | Compton | CA | — | ◇ UNVERIFIED |
| PMPar Metal Products, INC. | North Arlington | NJ | — | ◇ UNVERIFIED |
| PMPartners Metalfab, LP | La Marque | TX | — | ◇ UNVERIFIED |
| PPParton & Preble INC | Warren | MI | — | ◇ UNVERIFIED |
| PAPascor Atlantic Corporation | Bland | VA | — | ◇ UNVERIFIED |
| PCPaslin Company | Shelby Township | MI | — | ◇ UNVERIFIED |
| PMPatten's Metal Express, LLC | Franklinton | LA | — | ◇ UNVERIFIED |
| PKPaul Krivoy | Corpus Christi | TX | — | ◇ UNVERIFIED |
| PFPaul's Fabricating and Machine Works, INC. | Corpus Christi | TX | — | ◇ UNVERIFIED |
| PFPauls Fabricating and Machine Works INC. | Corpus Christi | TX | — | ◇ UNVERIFIED |
| PMPd Mechanical INC | Rialto | CA | — | ◇ UNVERIFIED |
| PPPdm Precast | Carlisle | IA | — | ◇ UNVERIFIED |
| PSPeak Steel L.l.c. | Apex | NC | — | ◇ UNVERIFIED |
| PMPeartree Manufacturing LLC | New Baltimore | MI | — | ◇ UNVERIFIED |
 Peerless Mfg. CO. | Cisco | TX | — | ◇ UNVERIFIED |
 Pegasus Steel | Ladson | SC | — | ◇ UNVERIFIED |
| PMPelican Metal Products LLC | Harrison Township | MI | — | ◇ UNVERIFIED |
| PSPenn Steel Fabrication, INC. | Bristol | PA | — | ◇ UNVERIFIED |
| PPPenz Products, INC. | Mishawaka | IN | — | ◇ UNVERIFIED |
| PEPerformance Energy Services, L.l.c. | Saint James | LA | — | ◇ UNVERIFIED |
| PEPerformance Energy Services LLC - Amelia Yard | Morgan City | LA | — | ◇ UNVERIFIED |
| PSPerformance Solutions LLC | Smyrna | TN | — | ◇ UNVERIFIED |
| PTPerformance Top Drives LLC | Three Rivers | TX | — | ◇ UNVERIFIED |
| PIPeters Interest LLC | Escondido | CA | — | ◇ UNVERIFIED |
| PSPhilbrook Steel, Inc. | Chelsea | ME | — | ◇ UNVERIFIED |
| PMPhilipp Mfg CO INC | Easthampton | MA | — | ◇ UNVERIFIED |
| PHPhillips Holdings LLC | Marion | IN | — | ◇ UNVERIFIED |
| PHP & H Mining Equipment | Milwaukee | WI | — | ◇ UNVERIFIED |
| PMPhoenix Manufacturing CO | Memphis | TN | — | ◇ UNVERIFIED |
| PMPhoenix Manufacturing, INC | Ogden | UT | — | ◇ UNVERIFIED |
| PMPhoenix Manufacturing LLC | Cole Camp | MO | — | ◇ UNVERIFIED |
| PMPhoenix Metal Desigs, Inc. | Brooklyn | NY | — | ◇ UNVERIFIED |
| PPPhoenix Precision Machining | Santa Clara | CA | — | ◇ UNVERIFIED |
| PMPiedmont Metals of Burlington | Burlington | NC | — | ◇ UNVERIFIED |
| PMPiedmont Metalworks, LLC | Durham | NC | — | ◇ UNVERIFIED |
| PTPiedmont Tower, INC. | Winston Salem | NC | — | ◇ UNVERIFIED |
| PMPierce Metals INC | Bristol | TN | — | ◇ UNVERIFIED |
| PIPinchback Industrial, INC. | Beaumont | TX | — | ◇ UNVERIFIED |
