| HMHeavy Motions INC | Ontario | CA | Machinery Manufacturing333996 | — | ◇ UNVERIFIED |
| HCHenry CO | Ontario | CA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| HFHeritage Foods | Ontario | CA | Textile Mills313310 | — | ◇ UNVERIFIED |
| HWHernandez Wrought Iron, INC. | Ontario | CA | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
| HPHexagon Purus Systems USA LLC | Ontario | CA | Transportation Equipment Manufacturing336992 | — | ◇ UNVERIFIED |
| HBHillerich & Bradsby CO INC | Ontario | CA | Miscellaneous Manufacturing339920 | — | ◇ UNVERIFIED |
| HHHillman Holdings LLC | Ontario | CA | Food Manufacturing311611 | — | ▲ REPORTED CLOSED |
| HPHi Performance Electric Vehicle Systems INC | Ontario | CA | Electrical Equipment, Appliance & Component Manufacturing335312 | — | ◇ UNVERIFIED |
| HIHubbell INC | Ontario | CA | Electrical Equipment, Appliance & Component Manufacturing335931 | — | ◇ UNVERIFIED |
| HCHuntsman Corporation | Ontario | CA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| HSHydraulic Solutions and Supplies LLC | Ontario | CA | Machinery Manufacturing333995 | — | ◇ UNVERIFIED |
| IPInca Plastics Molding CO INC | Ontario | CA | Plastics and Rubber Products Manufacturing326121 | — | ◇ UNVERIFIED |
| IDIndustrial Design System Inc. | Ontario | CA | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| IDIndustrial Design System Inc. | Ontario | CA | Furniture and Related Product Manufacturing337215 | — | ◇ UNVERIFIED |
| ITIndustrial Threaded Products INC | Ontario | CA | Fabricated Metal Product Manufacturing332722 | — | ◇ UNVERIFIED |
| IGInfinity Garment INC. | Ontario | CA | Apparel Manufacturing315999 | — | ◇ UNVERIFIED |
| IFInk Fx INC | Ontario | CA | Textile Product Mills314999 | — | ◇ UNVERIFIED |
| IEInland Empire Drive Line Service INC | Ontario | CA | Transportation Equipment Manufacturing336350 | — | ◇ UNVERIFIED |
| ICInnovative Conveyor System | Ontario | CA | Machinery Manufacturing333922 | — | ◇ UNVERIFIED |
| IPInnovative Polymer Sys INC | Ontario | CA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| IEInter-city Engery Systems, INC | Ontario | CA | Machinery Manufacturing333415 | — | ◇ UNVERIFIED |
| IIInvapharm INC | Ontario | CA | Food Manufacturing311999 | — | ◇ UNVERIFIED |
| ICIsmenia Campos | Ontario | CA | Plastics and Rubber Products Manufacturing326211 | — | ◇ UNVERIFIED |
| ICIvar's Cabinet Shop | Ontario | CA | Furniture and Related Product Manufacturing337215 | — | ◇ UNVERIFIED |
| JOJacck Oil INC. | Ontario | CA | Petroleum and Coal Products Manufacturing324110 | — | ◇ UNVERIFIED |
| JSJamac Steel, INC | Ontario | CA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| JSJames Schneider Products INC Dba Js Products | Ontario | CA | Furniture and Related Product Manufacturing337215 | — | ◇ UNVERIFIED |
 Jensen Enterprises INC Dba Jensen Precast | Ontario | CA | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| JVJesse Villarreal | Ontario | CA | Nonmetallic Mineral Product Manufacturing327410 | — | ◇ UNVERIFIED |
| JCJet Cutting Solutions Inc. | Ontario | CA | Plastics and Rubber Products Manufacturing326111 | — | ◇ UNVERIFIED |
| JJJ & J Enterprises | Ontario | CA | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| JSJnl Spring Mfg., INC. | Ontario | CA | Fabricated Metal Product Manufacturing332613 | — | ◇ UNVERIFIED |
| JBJohnson Bateman CO Inc/ a Calif CORP | Ontario | CA | Nonmetallic Mineral Product Manufacturing327332 | — | ◇ UNVERIFIED |
| JCJohnson-bateman Company | Ontario | CA | Nonmetallic Mineral Product Manufacturing327332 | — | ◇ UNVERIFIED |
| JBJon Bouch | Ontario | CA | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| JVJpjw Ventures LLC Dba Pirtek Inland Valley | Ontario | CA | Fabricated Metal Product Manufacturing332912 | — | ◇ UNVERIFIED |
| KIKargo-flex INC | Ontario | CA | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| KAKeystone Automotive Industries, INC. | Ontario | CA | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| KEKeystone Engineering Company | Ontario | CA | Transportation Equipment Manufacturing336413 | — | ◇ UNVERIFIED |
| KLKim Lighting | Ontario | CA | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| KAKo Am Machine Company | Ontario | CA | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| KFKomatsu Forklift USA LLC Dba Nationwide Mat'l Handling | Ontario | CA | Transportation Equipment Manufacturing336999 | — | ◇ UNVERIFIED |
| KUKost USA INC. | Ontario | CA | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| KMKovatch Mobile Equipment/fire Apparatus | Ontario | CA | Machinery Manufacturing333998 | — | ◇ UNVERIFIED |
| KFKw Food INC | Ontario | CA | Food Manufacturing311999 | — | ◇ UNVERIFIED |
| KZK & Z Cabinet CO INC | Ontario | CA | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| LBLa Bruna Industries INC | Ontario | CA | Wood Product Manufacturing321918 | — | ◇ UNVERIFIED |
| LILabruna Industries INC | Ontario | CA | Wood Product Manufacturing321918 | — | ◇ UNVERIFIED |
| LCLandec CORP | Ontario | CA | Machinery Manufacturing333241 | — | ◇ UNVERIFIED |
| LMLarry Methvin Installations INC | Ontario | CA | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
