| L2Location 2 / FNA | Fontana | 20–99 | ◐ LIKELY ACTIVE |
| LMLyco Machining, INC | Colton | — | ◐ LIKELY ACTIVE |
| MWMelvin Wrought Iron Inc - Main Shop | Ontario | 20–99 | ◐ LIKELY ACTIVE |
| MSMetal Sales - Fontana | Fontana | 20–99 | ◐ LIKELY ACTIVE |
| MCMfab CORP | Oak Hills | — | ◐ LIKELY ACTIVE |
| QTQuality Tech Mfg., INC. | Bloomington | — | ◐ LIKELY ACTIVE |
| RRancho | Rancho Cucamonga | 20–99 | ◐ LIKELY ACTIVE |
 Schlosser Forge - Rancho Cucamonga | Rancho Cucamonga | 100–499 | ◐ LIKELY ACTIVE |
| SISmith Iron Works-Hesperia Iron | Hesperia | 20–99 | ◐ LIKELY ACTIVE |
| SCSpecialty Coating Systems Ontario CA | Ontario | 20–99 | ◐ LIKELY ACTIVE |
| SSteelcraft-Chino | Chino | 20–99 | ◐ LIKELY ACTIVE |
| TBThe Bedelian Collection & CO LLC | Apple Valley | — | ◐ LIKELY ACTIVE |
| WAWalrath a Matthew | Oak Hills | — | ◐ LIKELY ACTIVE |
| WPWatsons Profiling CORP | Ontario | — | ◐ LIKELY ACTIVE |
| WWCC-Ontario | Ontario | 20–99 | ◐ LIKELY ACTIVE |
| WCWest Coast Spiral Pipe | Rialto | 20–99 | ◐ LIKELY ACTIVE |
| WIWestco Industries Inc | Bloomington | 20–99 | ◐ LIKELY ACTIVE |
| DPDcl Precision, INC. | Apple Valley | — | ◐ LIKELY ACTIVE |
| UGUnlimited Garage Doors and Gates LLC | Yucca Valley | — | ◐ LIKELY ACTIVE |
| XEXavier Edward Lizardi | Rch Cucamonga | — | ◐ LIKELY ACTIVE |
| COChoi Ornamental Iron Works Corporation Dba Best Iron Works | San Bernardino | — | ◇ UNVERIFIED |
| CFCustom Fabricated Metals, LLC | Fontana | — | ◇ UNVERIFIED |
| FAFalcon Abrasive Manufacturing INC | Montclair | — | ◇ UNVERIFIED |
| IMInnovative Metal Industries INC | San Bernardino | — | ◇ UNVERIFIED |
| VFVanguard Fabrications Corporation | Fontana | — | ◇ UNVERIFIED |
| 3C333 Custom Spectrum, INC. | Chino | — | ◇ UNVERIFIED |
| AOAce Ornamental | Pomona | — | ◇ UNVERIFIED |
| AIAcra Industries,Corp. | Ontario | — | ◇ UNVERIFIED |
| ADAdvance Disposal CO. | Hesperia | — | ◇ UNVERIFIED |
| AMAerospace Mill Products LLC | Ontario | — | ◇ UNVERIFIED |
| ALAlaco Ladder CO | Chino | — | ◇ UNVERIFIED |
| AAAll American Fence | Hesperia | — | ◇ UNVERIFIED |
| ABAllegiance Business Corporation Dba Hi Tech Precision | Montclair | — | ◇ UNVERIFIED |
| AMAllen Machine INC. | Montclair | — | ◇ UNVERIFIED |
| ALA L M Services | Bloomington | — | ◇ UNVERIFIED |
| AFAlpha Fabrication | San Bernardino | — | ◇ UNVERIFIED |
| ASAmazing Steel | Montclair | — | ◇ UNVERIFIED |
| ASAmazing Steel CORP Dba Amazing Hydraulics Dba Mitc | Montclair | — | ◇ UNVERIFIED |
| AEAmerican Equipment | Victorville | — | ◇ UNVERIFIED |
| ASAmerican Security Products INC | Fontana | — | ◇ UNVERIFIED |
| AIAmp INC | Ontario | — | ◇ UNVERIFIED |
| AIAndersen Industries - Adelanto | Adelanto | — | ◇ UNVERIFIED |
| ACAnderson Charnesky Structural Steel INC | Yucaipa | — | ◇ UNVERIFIED |
| AMAngelus Mfg. | Chino | — | ◇ UNVERIFIED |
| ACApnivex CORP Dba Comm-fab | Chino | — | ◇ UNVERIFIED |
| AArconic | Fontana | — | ◇ UNVERIFIED |
| AIArconic INC. | Rancho Cucamonga | — | ◇ UNVERIFIED |
| APArtifex Plumbing &pipeline LLC | Chino | — | ◇ UNVERIFIED |
| APAsc Profiles INC Dba Aep Span | Fontana | — | ◇ UNVERIFIED |
| APAsr Powder Coating LLC. | Fontana | — | ◇ UNVERIFIED |
