| PSPacific Steel Casting Co-plant | Berkeley | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| PSPacific Steel Casting Co-plant #1 | Berkeley | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| PSPacific Steel Casting Co-plant #3 | Berkeley | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| PSPacific Steel Group | Bloomington | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| PCParamit Corporation | Morgan Hill | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| PEParamount Extrusions CO. | Paramount | CA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| PRParamount Roll & Forming, INC. | Adelanto | CA | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| PMPaul Matsumoto | Rio Linda | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| PSPciw Steel CORP | San Diego | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| PAPerformance Aluminum Products | Ontario | CA | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| PMPerformance Machine LLC | Cerritos | CA | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| PSPerimeter Solutions LP | Mcclellan | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| PIPhibro-tech, INC. | Buttonwillow | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| PAPhysician's Automated Laboratory Dba Central Coast Pathology Laborator | San Luis Obispo | CA | Primary Metal Manufacturing331311 | — | ◇ UNVERIFIED |
| PSPmb Supply and Mfg INC | Chico | CA | Primary Metal Manufacturing331411 | — | ◇ UNVERIFIED |
| PMPmw Manufacturing | Industry | CA | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| PEPowerhouse Entertainment LLC | North Hollywood | CA | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| PCPrecision Cast Products | Oakland | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
 Precision Founders, INC. Dba Pcc Structurals San Leandro | San Leandro | CA | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| PRProfessional Refinishing Org | La Puente | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| PSProminent Systems INC | City of Industry | CA | Primary Metal Manufacturing331311 | — | ◇ UNVERIFIED |
| PDProtech Design | Anaheim | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| PWPutzmeister West INC | Santa Fe Spgs | CA | Primary Metal Manufacturing331411 | — | ◇ UNVERIFIED |
| QAQuailty Automotive | Westminster | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
 Quality Aluminum Forge INC | Long Beach | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| QFQuantum Fuel Systems Technologies INC | Lake Forest | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| QIQuemetco INC | City of Industry | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| QQQuick Quack Car Wash Coe | Roseville | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| RFRain for Rent INC | Woodland | CA | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| RORamcast Ornamental Supply CO INC | Fresno | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| RFRamirez Foundry | El Cajon | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| RDRangers Die Casting CO | Lynwood | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| RIRasirc INC | San Diego | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| RHRaymond Handling | Santa Fe Springs | CA | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| RSRecycling Services Alliance, I | Fremont | CA | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| RMReed Manufacturing INC Dba American Casting CO | Hollister | CA | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| RSRegional Steel CORP | Fontana | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| RSRelativity Space INC | Inglenook | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| RSReliable Steel Building Products INC | South Gate | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| RSRenco Systems INC | Banning | CA | Primary Metal Manufacturing331529 | — | ◇ UNVERIFIED |
| RTRennsteig Tools INC | Camarillo | CA | Primary Metal Manufacturing331529 | — | ◇ UNVERIFIED |
| REReuland Electric CO | Industry | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| RMRichard Macdonald Studios INC. | Monterey | CA | Primary Metal Manufacturing331522 | — | ◇ UNVERIFIED |
| RFRidge Foundry INC | San Leandro | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| RIR&k Industrial Products INC | Richmond | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| RMRoto Metals, INC | San Francisco | CA | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| RSRoy S. Waisman | Palmdale | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| RPR P M Centerless Grinding CO | Norco | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| RWRt Welding | Hesperia | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| RARucker and Kolls INC | Milpitas | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
