| SWSentry Welding | Barstow | — | ◇ UNVERIFIED |
| SPShawcor Pipe Protection LLC. | Fontana | — | ◇ UNVERIFIED |
| STSierra Torque Converters,dba Nasir Kassa | Ontario | — | ◇ UNVERIFIED |
| SSSimpson Strong Tie | Riverside | — | ◇ UNVERIFIED |
| SCSo Cal Tank & Fab | Chino | — | ◇ UNVERIFIED |
| SPSoc-co Plastic Coating CO | Rancho Cucamonga | — | ◇ UNVERIFIED |
| SGSouth Gate Engineering LLC | Chino | — | ◇ UNVERIFIED |
| SPSouthland Pipe Corporation | Hesperia | — | ◇ UNVERIFIED |
| STSpede Tool Mfg CO -yucca Rd | Adelanto | — | ◇ UNVERIFIED |
| SESprayline Enter. INC | Ontario | — | ◇ UNVERIFIED |
| SDStanley Doors Sys | Rancho Cucamonga | — | ◇ UNVERIFIED |
| SCSteel Co, INC | Bloomington | — | ◇ UNVERIFIED |
| SISteelco INC | Bloomington | — | ◇ UNVERIFIED |
| SUSteelCo U.S.A | Chino | — | ◇ UNVERIFIED |
| SBSummers Brothers Inc. | Ontario | — | ◇ UNVERIFIED |
| SSSuperior Sandblasting & Coatings | Fontana | — | ◇ UNVERIFIED |
 Superior Tank CO INC | Rancho Cucamonga | — | ◇ UNVERIFIED |
| TSTehran Sanaat INC | San Bernardino | — | ◇ UNVERIFIED |
| TITgeg INC. | Chino | — | ◇ UNVERIFIED |
| TOThe Outdoor Plus Company, Inc. | Ontario | — | ◇ UNVERIFIED |
| TITomkins Industrial Painting | Trona | — | ◇ UNVERIFIED |
| TSTournesal Siteworks | Fontana | — | ◇ UNVERIFIED |
| TLTracy Lynn Oakley & David Jonathan Burke | Colton | — | ◇ UNVERIFIED |
| TITree Island Wire USA INC Dba Halsteel INC | Ontario | — | ◇ UNVERIFIED |
| TTTrend Technologies LLC | Chino | — | ◇ UNVERIFIED |
| TSTreon Steel Fabricators INC | Fontana | — | ◇ UNVERIFIED |
| UPUnited Partition Systems Inc | Ontario | — | ◇ UNVERIFIED |
| UTUnited Tube Bending | Montclair | — | ◇ UNVERIFIED |
| USUniversal Steel Services, INC. | San Bernardino | — | ◇ UNVERIFIED |
| UPUS Pipe Fabrication | Fontana | — | ◇ UNVERIFIED |
| VPVorteq Pacific | Rancho Cucamonga | — | ◇ UNVERIFIED |
| VIVsc INC Dba Vulcan Steel Company | Bloomington | — | ◇ UNVERIFIED |
| VIVsc Incorporated Dba Vulcan Steel Company | Bloomington | — | ◇ UNVERIFIED |
| WLWac LLC | Ontario | — | ◇ UNVERIFIED |
| WIWadco Ind INC | Fontana | — | ◇ UNVERIFIED |
| WCWalker Corporation | Ontario | — | ◇ UNVERIFIED |
| WSWarrior Systems | Ontario | — | ◇ UNVERIFIED |
| WBWc Brown Welding INC | Rialto | — | ◇ UNVERIFIED |
| WCW C Brown Weldingna INC. | Fontana | — | ◇ UNVERIFIED |
| WCWest Coast Metal Works | Hesperia | — | ◇ UNVERIFIED |
| WCWest Coast Steel & Processing Dba Great Pacific Elbow | Chino | — | ◇ UNVERIFIED |
| WCWest Coast Steel & Processing, LLC | Chino | — | ◇ UNVERIFIED |
| WFWestern Fabricators | Hesperia | — | ◇ UNVERIFIED |
| WMWestern Metal Decorating CO | Rancho Cucamonga | — | ◇ UNVERIFIED |
| WMWestern Mouldings | Upland | — | ◇ UNVERIFIED |
| WDWilliam D Ludlow | Ontario | — | ◇ UNVERIFIED |
| WAWorthington Armstrong Venture | Fontana | — | ◇ UNVERIFIED |
| ZWZimex Well Products, LLC | Ontario | — | ◇ UNVERIFIED |
