| NINew Indy Containerboard Ontario | Ontario | CA | Paper Manufacturing322130 | 100-499 | ◐ LIKELY ACTIVE |
| NBNiagara Bottling, LLC - Concours St. | Ontario | CA | Beverage and Tobacco Product Manufacturing312112 | 100-499 | ◐ LIKELY ACTIVE |
| O3Ontario-3mus-ca 3m Pi | Ontario | CA | Miscellaneous Manufacturing339113 | 1-19 | ◐ LIKELY ACTIVE |
| OCOntario Container | Ontario | CA | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| OPOntario Plant | Ontario | CA | Transportation Equipment Manufacturing336214 | 20-99 | ◐ LIKELY ACTIVE |
| OIOtto Instrument Services, INC. | Ontario | CA | Transportation Equipment Manufacturing336411 | 100-499 | ◐ LIKELY ACTIVE |
| PCPMR Co., Inc. | Ontario | CA | Plastics and Rubber Products Manufacturing326291 | 20-99 | ◐ LIKELY ACTIVE |
| PBPrimo Brands - Ontario Factory | Ontario | CA | Beverage and Tobacco Product Manufacturing312112 | 20-99 | ◐ LIKELY ACTIVE |
| PBPrimo Brands - West Transport | Ontario | CA | Plastics and Rubber Products Manufacturing326160 | 20-99 | ◐ LIKELY ACTIVE |
| PProtecPac | Ontario | CA | Plastics and Rubber Products Manufacturing326150 | 1-19 | ◐ LIKELY ACTIVE |
| RWRecycled Wood Prodcuts | Ontario | CA | Wood Product Manufacturing321999 | 20-99 | ◐ LIKELY ACTIVE |
| RBRyder - Birchstone Ontario | Ontario | CA | Wood Product Manufacturing321920 | 1-19 | ◐ LIKELY ACTIVE |
| SASan Antonio Winery | Ontario | CA | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| SDSan Dimas Luggage-ontario | Ontario | CA | Leather and Allied Product Manufacturing316992 | 100-499 | ◐ LIKELY ACTIVE |
| SPSchwarz Partners | Ontario | CA | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| SCSpecialty Coating Systems Ontario CA | Ontario | CA | Fabricated Metal Product Manufacturing332812 | 20-99 | ◐ LIKELY ACTIVE |
| S5Store 584 | Ontario | CA | Food Manufacturing311812 | 20-99 | ◐ LIKELY ACTIVE |
| TUToto USA Ontario | Ontario | CA | Nonmetallic Mineral Product Manufacturing327110 | 20-99 | ◐ LIKELY ACTIVE |
| TPTranscontinental Packaging Ontario | Ontario | CA | Plastics and Rubber Products Manufacturing326113 | 20-99 | ◐ LIKELY ACTIVE |
| TPTravel Pallets, LLC | Ontario | CA | Wood Product Manufacturing321920 | — | ◐ LIKELY ACTIVE |
| VLVenturaFoods LLC | Ontario | CA | Food Manufacturing311225 | 500+ | ◐ LIKELY ACTIVE |
| VLVWGoA Los Angeles PDC | Ontario | CA | Transportation Equipment Manufacturing336111 | 20-99 | ◐ LIKELY ACTIVE |
| WDWagner Die Supply | Ontario | CA | Machinery Manufacturing333514 | 1-19 | ◐ LIKELY ACTIVE |
| WPWatsons Profiling CORP | Ontario | CA | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| WOWebasto Ontario | Ontario | CA | Computer and Electronic Product Manufacturing334515 | 1-19 | ◐ LIKELY ACTIVE |
| WEWinholt Equipment Corp | Ontario | CA | Furniture and Related Product Manufacturing337127 | 20-99 | ◐ LIKELY ACTIVE |
| WFWorldwide Foam - Ontario, CA | Ontario | CA | Plastics and Rubber Products Manufacturing326150 | 1-19 | ◐ LIKELY ACTIVE |
| ZPZapp Packaging, Inc. | Ontario | CA | Paper Manufacturing322212 | 20-99 | ◐ LIKELY ACTIVE |
| 7D7 Daze LLC | Ontario | CA | Beverage and Tobacco Product Manufacturing312230 | — | ◇ UNVERIFIED |
| ASAaren Scientific INC | Ontario | CA | Miscellaneous Manufacturing339115 | — | ◇ UNVERIFIED |
| ABAlmazan Bakery #2 | Ontario | CA | Food Manufacturing311812 | 1-19 | ◇ UNVERIFIED |
| ATAuburn Tile | Ontario | CA | Nonmetallic Mineral Product Manufacturing327332 | 1-19 | ◇ UNVERIFIED |
| BIBert-co Industries INC. | Ontario | CA | Paper Manufacturing322212 | — | ◇ UNVERIFIED |
| BFBesteel Fabricaiton INC | Ontario | CA | Fabricated Metal Product Manufacturing332312 | 1-19 | ◇ UNVERIFIED |
| CIConverse INC | Ontario | CA | Leather and Allied Product Manufacturing316211 | — | ◇ UNVERIFIED |
| CPCustom Plastics INC | Ontario | CA | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◇ UNVERIFIED |
| DBDb Building Fasteners INC | Ontario | CA | Fabricated Metal Product Manufacturing332312 | 20-99 | ◇ UNVERIFIED |
| HPHi Performance Electric Vehicle Systems INC | Ontario | CA | Machinery Manufacturing333999 | 1-19 | ◇ UNVERIFIED |
| ISInland Signs INC | Ontario | CA | Fabricated Metal Product Manufacturing332813 | 1-19 | ◇ UNVERIFIED |
| IAInnovative Architectural Solutions INC | Ontario | CA | Fabricated Metal Product Manufacturing332323 | 1-19 | ◇ UNVERIFIED |
| MIMinsley, INC. | Ontario | CA | Food Manufacturing311999 | 20-99 | ◇ UNVERIFIED |
| NINicca Investments, Inc. | Ontario | CA | Fabricated Metal Product Manufacturing332812 | 1-19 | ◇ UNVERIFIED |
| OBOntario Bakery INC | Ontario | CA | Food Manufacturing311811 | 1-19 | ◇ UNVERIFIED |
| PPPsa - Printing & Mailing Services INC | Ontario | CA | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| RPReed Printing INC | Ontario | CA | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| RJR & J Welding & Metal Fabrication | Ontario | CA | Fabricated Metal Product Manufacturing332313 | — | ◇ UNVERIFIED |
| SISentry Industries INC | Ontario | CA | Chemical Manufacturing325991 | 1-19 | ◇ UNVERIFIED |
| SLSolar Link International INC | Ontario | CA | Leather and Allied Product Manufacturing316210 | — | ◇ UNVERIFIED |
| TPThoro Packaging | Ontario | CA | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| WCWalker Corporation | Ontario | CA | Fabricated Metal Product Manufacturing332119 | — | ◇ UNVERIFIED |