| TITst INC | Fontana | CA | Primary Metal Manufacturing331313 | 100-499 | ● ACTIVE |
 Pacific Corrugated Pipe Company LLC | Fontana | CA | Plastics and Rubber Products Manufacturing326122 | — | ● ACTIVE |
| VMVista Metals Corporation | Fontana | CA | Primary Metal Manufacturing331314 | 100-499 | ◐ LIKELY ACTIVE |
| CSCalifornia Steel Industries | Fontana | CA | Primary Metal Manufacturing331110 | 500+ | ◐ LIKELY ACTIVE |
| FMForged Metals INC | Fontana | CA | Primary Metal Manufacturing331110 | 100-499 | ◐ LIKELY ACTIVE |
| SASierra Aluminum- Finishing | Fontana | CA | Primary Metal Manufacturing331313 | 100-499 | ◐ LIKELY ACTIVE |
| ASAmeron Steel Fabrication Division | Fontana | CA | Nonmetallic Mineral Product Manufacturing327332 | — | ◇ UNVERIFIED |
| SASierra Aluminum - Bonanza | Fontana | CA | Primary Metal Manufacturing331318 | 100-499 | ◐ LIKELY ACTIVE |
| SASierra Aluminum - NAPA | Fontana | CA | Primary Metal Manufacturing331318 | 20-99 | ◐ LIKELY ACTIVE |
| SASierra Aluminum - Union | Fontana | CA | Primary Metal Manufacturing331318 | 20-99 | ◐ LIKELY ACTIVE |
| ADAmerican Die Casting | Fontana | CA | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| CMCamco Machine INC | Fontana | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| D1Drivetime-fontana 1c (drivetime Car Sale | Fontana | CA | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| FKFormer Kaiser Steel Mill Facility | Fontana | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| HIHartman Industries Dba Commercial Casting Company | Fontana | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| KCKaiser Commerce Center | Fontana | CA | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| KMKloeckner Metals Corporation | Fontana | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| RSRegional Steel CORP | Fontana | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
 Schlosser Forge Company Rancho Plant #2 | Fontana | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| SPShawcor Pipe Protection LLC. | Fontana | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| SASierra Aluminum Architectural | Fontana | CA | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| SASierra Aluminum Company | Fontana | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| SASierra Aluninum Fontana Extrusion Operation | Fontana | CA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| USU S Reduction CO | Fontana | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
