| TMThyssenkrupp Materials Na/ - Ken Mac Metals | Santa Fe Spgs | CA | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| TSTitanium Specialties | Taft | CA | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| TWTi Wire | Etiwanda | CA | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| TTTotten Tubes INC - Santee | Santee | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TTTransition45 Technologies INC | Orange | CA | Primary Metal Manufacturing331528 | — | ◇ UNVERIFIED |
| TITree Island Steel Dba Tree Island Wire USA INC | San Bernardino | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| TITree Island Wire | Rancho Cucamonga | CA | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| TITree Island Wire (usa) INC. | Walnut | CA | Primary Metal Manufacturing331422 | — | ◇ UNVERIFIED |
| TGTri-alloy Group, LLC | Montclair | CA | Primary Metal Manufacturing331312 | — | ◇ UNVERIFIED |
| TFTriangle Fasteners INC | Ontario | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| TITru-cut INC | Gardena | CA | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| TSTryad Service CORP. | Shafter | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| THTubbs Holding | Sacramento | CA | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| TBTube Bending Specialists & Machinery, LLC | Hayward | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TCTusco Casting Corporation | Lodi | CA | Primary Metal Manufacturing331528 | — | ◇ UNVERIFIED |
| TBTy Bar CORP | South Gate | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| TNTyvak Nano Satellite Systems | Irvine | CA | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| UUlbrich | Pico Rivera | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| UUUltra USA INC | Los Angeles | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| UAUmc Acquisition CORP | Lynwood | CA | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| UAUnited Alloys INC | Los Angeles | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| UPUnited Pipe & Steel | Stockton | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| USUnited Security Product INC | Poway | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| USUnited Spiral Pipe LLC Manufacturing Plan | Pittsburg | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| UAUniversal Alloy Corporation | Anaheim | CA | Primary Metal Manufacturing331316 | — | ◇ UNVERIFIED |
| UDUniversal Die Casting CO | Los Angeles | CA | Primary Metal Manufacturing331522 | — | ◇ UNVERIFIED |
| UMUniversal Machine Company INC | Paramount | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| UMUniversal Molding Company | Lynwood | CA | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| UMUniversal Molding Company INC. | Anaheim | CA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| UPUSA Produce | Los Banos | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| UCUsg Ceilings Plus LLC | Commerce | CA | Nonmetallic Mineral Product Manufacturing327122 | — | ◇ UNVERIFIED |
| UPUS Pole Company | Palmdale | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| USU S Reduction CO | Fontana | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| USU S Technical Ceramics INC | Morgan Hill | CA | Primary Metal Manufacturing331311 | — | ◇ UNVERIFIED |
| VPValley Pattern & Mfg INC. | Stockton | CA | Primary Metal Manufacturing331529 | — | ◇ UNVERIFIED |
| VEVcx Enviro. Lab. / Accu Labs Irvine | Irvine | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| VCVeneman Collection | Westminster | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| VIViasat, INC. | Carlsbad | CA | Primary Metal Manufacturing331528 | — | ◇ UNVERIFIED |
| VIVigindustries INC | Vernon | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| VCVoltaire Compressor Solution Dba Voltaire Incorporated | Oakland | CA | Primary Metal Manufacturing331410 | — | ◇ UNVERIFIED |
| WFWaterman Foundry | Exeter | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| WWelaco | Bakersfield | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| WEW E Machine INC. | San Dimas | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| WCWesgo Ceramics | Belmont | CA | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| WCWest Coast Innovations | Redding | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| WCWest Coast Stainless Products | Huntington Park | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| WCWestern Castings Company | Santa Clara | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| WMWestern Metal Enterprises, INC. | Montebello | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| WOWestern Oilfield Supply CO Dba Rain for Rent | Bakersfield | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| WWet | Sun Valley | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
