| MGMaplegrove Gluten Free Foods INC. | Fontana | CA | Food Manufacturing311823 | — | ◇ UNVERIFIED |
| MLMarathon LLC | Fontana | CA | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| MPMeza Pallets INC | Fontana | CA | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| MWMikes Welding INC | Fontana | CA | Furniture and Related Product Manufacturing337215 | — | ◇ UNVERIFIED |
| MMMill Man Steel INC | Fontana | CA | Fabricated Metal Product Manufacturing332313 | — | ◇ UNVERIFIED |
| MPMonthes Pallets, Inc. | Fontana | CA | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
 Musco Sports Lighting LLC | Fontana | CA | Electrical Equipment, Appliance & Component Manufacturing335129 | — | ◇ UNVERIFIED |
| MMMv M16 LLC | Fontana | CA | Transportation Equipment Manufacturing336340 | — | ◇ UNVERIFIED |
| NLNew Leaf Bio-fuel for Separation By Design | Fontana | CA | Petroleum and Coal Products Manufacturing324110 | — | ◇ UNVERIFIED |
| NANorberto Alvarado an Ind. Dba Artista's Pallets | Fontana | CA | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
 Oldcastle Infrastructure, INC - Fontana | Fontana | CA | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| OPOn Point Truck Sales LLC | Fontana | CA | Transportation Equipment Manufacturing336111 | — | ◇ UNVERIFIED |
| PDPacific Diazo Prods INC Fontana | Fontana | CA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| PTPacific Tank Engineering, INC | Fontana | CA | Transportation Equipment Manufacturing336992 | — | ◇ UNVERIFIED |
| PSParcell Steel CORP | Fontana | CA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
 Patrick Industries INC | Fontana | CA | Wood Product Manufacturing321212 | — | ◇ UNVERIFIED |
| PRPioneer Roofing Tile INC | Fontana | CA | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| PSPioneer Star Group, INC. | Fontana | CA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| PLPrologis LP | Fontana | CA | Wood Product Manufacturing321114 | — | ◇ UNVERIFIED |
| PGPryor Giggey CO | Fontana | CA | Nonmetallic Mineral Product Manufacturing327124 | — | ◇ UNVERIFIED |
| QSQuanex Screens/quanex Building Products | Fontana | CA | Fabricated Metal Product Manufacturing332321 | — | ◇ UNVERIFIED |
| RCRafael Carillo | Fontana | CA | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| RSRed Star Logistics, Inc. | Fontana | CA | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| RSRegional Steel CORP | Fontana | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| RBRichard Brahier dba R&K CUSTOM CYCLES AND HOT ROD CITY | Fontana | CA | Transportation Equipment Manufacturing336991 | — | ◇ UNVERIFIED |
| RWRj Welding | Fontana | CA | Machinery Manufacturing333415 | — | ◇ UNVERIFIED |
| RCRnd Contractors INC | Fontana | CA | Fabricated Metal Product Manufacturing332117 | — | ◇ UNVERIFIED |
| RSRoad Systems INC | Fontana | CA | Transportation Equipment Manufacturing336212 | — | ◇ UNVERIFIED |
| RRRobertson's Ready Mix INC | Fontana | CA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| RERoca Engineering Inc. | Fontana | CA | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| RCRodolfo Cortes | Fontana | CA | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| RERogers Exhaust Shop | Fontana | CA | Beverage and Tobacco Product Manufacturing312230 | — | ◇ UNVERIFIED |
| SGSan Gabriel Valley Lumber & Milling CO INC | Fontana | CA | Wood Product Manufacturing321918 | — | ◇ UNVERIFIED |
 Schlosser Forge Company Rancho Plant #2 | Fontana | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| SCSchutz Container Systems INC | Fontana | CA | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SPShawcor Pipe Protection LLC. | Fontana | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| SASierra Aluminum Architectural | Fontana | CA | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| SASierra Aluminum CO | Fontana | CA | Furniture and Related Product Manufacturing337215 | — | ◇ UNVERIFIED |
| SASierra Aluminum Company | Fontana | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| SASierra Aluninum Fontana Extrusion Operation | Fontana | CA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| SSSimpson Sandblasting & Special Coatings, INC | Fontana | CA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| SCSouthern California Screen Pri | Fontana | CA | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| SMSouthwest Medical Resources LLC | Fontana | CA | Computer and Electronic Product Manufacturing334510 | — | ◇ UNVERIFIED |
| SMSpecialized Milling Corporation | Fontana | CA | Wood Product Manufacturing321912 | — | ◇ UNVERIFIED |
| SSSpeedway Sbc Development, LLC | Fontana | CA | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| SGSunkist Growers INC | Fontana | CA | Food Manufacturing311421 | — | ◇ UNVERIFIED |
| SLSuperior Lawn Mower Center INC | Fontana | CA | Machinery Manufacturing333112 | — | ◇ UNVERIFIED |
| SSSuperior Sandblasting & Coatings | Fontana | CA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| STSuperior Trailer Work | Fontana | CA | Machinery Manufacturing333924 | — | ◇ UNVERIFIED |
| STSupreme Truck Bodies of Cal | Fontana | CA | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
