| NSNorthland Stainless INC | Tomahawk | WI | — | ◇ UNVERIFIED |
| OSOak Street Tank & Steel INC | Ashland | OR | — | ◇ UNVERIFIED |
| OLOhmstede LTD - Ohmstede LTD St Gabriel Plant | Saint Gabriel | LA | — | ◇ UNVERIFIED |
| OCOsynergy Company, LLC | Edinburg | TX | — | ◇ UNVERIFIED |
| PTPacific Tank & Energy LLC | Arlington | WA | — | ◇ UNVERIFIED |
| PMPalmer Mfg. & Tank, Inc.-palm | Dickinson | ND | — | ◇ UNVERIFIED |
| POPalmer of Texas | Loco Hills | NM | — | ◇ UNVERIFIED |
| PTPalmer Tank & Construction, INC. | Bakersfield | CA | — | ◇ UNVERIFIED |
| PIPamlar INC | Ojai | CA | — | ◇ UNVERIFIED |
| PRPaso Robles Tank -brown- Minneapolis Tank INC. | Sparks | NV | — | ◇ UNVERIFIED |
| PIPcl Industrial Services INC | Bakersfield | CA | — | ◇ UNVERIFIED |
| PHPermian Holdings, INC. | Odessa | TX | — | ◇ UNVERIFIED |
| PTPermian Tank & Manufacturing | Odessa | TX | — | ◇ UNVERIFIED |
| PTPermian Tank & Manufacturing INC Belle Fourche Plant | Belle Fourche | SD | — | ◇ UNVERIFIED |
 Phoenix Fabricators and Erectors INC | Nicholasville | KY | — | ◇ UNVERIFIED |
| Phoenix Fabricators and Erectors INC | Helena | GA | — | ◇ UNVERIFIED |
| PFPhoenix Fabricators & Erectors INC | Sebree | KY | — | ◇ UNVERIFIED |
| PTPioneer Tank & Vessel LLC | Portland | OR | — | ◇ UNVERIFIED |
| PTPioneer Tank & Vessel LLC | Portland | OR | — | ◇ UNVERIFIED |
| PKPortland Kettle Works LLC | Portland | OR | — | ◇ UNVERIFIED |
| PTPrairie Tank & Construction CO. | Pell City | AL | — | ◇ UNVERIFIED |
| PPPremier Protective Coatings CO. | Evans, 0.2 Mi Se of | CO | — | ◇ UNVERIFIED |
| PPPremier Pump and Power | Vancouver | WA | — | ◇ UNVERIFIED |
| PSPressed Steel Tank CO INC | Milwaukee | WI | — | ◇ UNVERIFIED |
| PIProco, INC. | Kingsville | TX | — | ◇ UNVERIFIED |
| PSProcyon-alpha Squared INC | Cookeville | TN | — | ◇ UNVERIFIED |
| PTProfessional Tank Gauge, INC. | Georgetown | TX | — | ◇ UNVERIFIED |
 Progressive Recovery, Inc. | Ballwin | MO | — | ◇ UNVERIFIED |
| Progressive Recovery, Inc. | Ballwin | MO | — | ◇ UNVERIFIED |
| Progressive Recovery, Inc. | St. Louis | MO | — | ◇ UNVERIFIED |
| Progressive Recovery, Inc. | Ballwin | MO | — | ◇ UNVERIFIED |
| PTPro Tank Products | Plentywood | MT | — | ◇ UNVERIFIED |
| PTPro Tank Products | Minot | ND | — | ◇ UNVERIFIED |
| PCPrt/bmt Company | Albuquerque | NM | — | ◇ UNVERIFIED |
| PSPuget Sound Repair INC | Seattle | WA | — | ◇ UNVERIFIED |
| QSQuality Steel Corporation | West Jordan | UT | — | ◇ UNVERIFIED |
| QSQuality Steel Corporation | Thomasville | GA | — | ◇ UNVERIFIED |
| QTQuality Tank Solutions, LLC | Marshfield | WI | — | ◇ UNVERIFIED |
| RFRamco Fabricators, INC. | Colfax | NC | — | ◇ UNVERIFIED |
| RMRatermann Manufacturing, Inc. | Nashville | TN | — | ◇ UNVERIFIED |
| RCR. C. Technical Welding & Fabrication, INC. | Stafford | TX | — | ◇ UNVERIFIED |
| RRedguard | Wichita | KS | — | ◇ UNVERIFIED |
| RRedguard | Wichita | KS | — | ◇ UNVERIFIED |
| RLRedguard LLC | Halstead | KS | — | ◇ UNVERIFIED |
| RTRiverside Tank & Manufacturing CORP | Saint Clair | MI | — | ◇ UNVERIFIED |
| RBRobert Bosch Tool CORP | Heber Springs | AR | — | ◇ UNVERIFIED |
| RWRolando's Welding & Fabricating | Robstown | TX | — | ◇ UNVERIFIED |
| SPSamuel Pressure Vessel Group | Tomahawk | WI | — | ◇ UNVERIFIED |
| SISchake Ind/oil City | Oil City | PA | — | ◇ UNVERIFIED |
| SWShawn Wallace Dba United Maintenance & Fabrication | Memphis | TN | — | ◇ UNVERIFIED |
