| Ontic NC | Manufacturing | 0 | — | C |
| ONTIVITY LLC TX | Construction | 1 | $104,000 | A |
| Onto Innovation, Inc. MA | Manufacturing | 8 | $129,894 | — |
| Onton Inc. CA | Information & Media | 2 | $161,277,500 | — |
| Ontrac AZ | Transportation & Warehousing | 0 | — | A |
| Ontrac CA | Transportation & Warehousing | 0 | — | D |
| Ontrac CO | Transportation & Warehousing | 0 | — | B |
| Ontrac IA | Transportation & Warehousing | 0 | — | A |
| Ontrac ID | Transportation & Warehousing | 0 | — | C |
| Ontrac MN | Transportation & Warehousing | 0 | — | A |
| Ontrac NE | Transportation & Warehousing | 0 | — | A |
| Ontrac NV | Transportation & Warehousing | 0 | — | D |
| Ontrac SD | Transportation & Warehousing | 0 | — | A |
| Ontrac TX | Transportation & Warehousing | 0 | — | C |
| Ontrac UT | Transportation & Warehousing | 0 | — | D |
| Ontrac WA | Transportation & Warehousing | 0 | — | D |
| Ontrac, Inc KY | Construction | 0 | — | F |
| OnTrack Scheduling, Inc. NV | Professional & Technical Services | 2 | $148,500 | — |
| OnTrack, Inc. SC | Administrative & Waste Services | 0 | — | F |
| Ontrail, Inc. CA | Finance & Insurance | 1 | $167,710 | — |
| ONU LOGISTICS VA | Transportation & Warehousing | 0 | — | B |
| Onur Ulgen, Inc. MI | Professional & Technical Services | 1 | $82,638 | — |
| Onward Energy CO | Utilities | 0 | — | A |
| Onward Energy MN | Utilities | 0 | — | F |
| Onward Energy NC | Utilities | 0 | — | A |
| Onward Manufacturing Company TN | Manufacturing | 0 | — | F |
| Onward Robotics (f/k/a IAM ROBOTICS, INC.) PA | Professional & Technical Services | 1 | $100,000 | — |
| ONWARD TECHNOLOGIES, INC IL | Professional & Technical Services | 21 | $97,648 | — |
| ONX, Inc. FL | — | 0 | — | — |
| ONX, Inc. TX | Construction | 1 | $90,000 | — |
| ONY Biotech NY | Manufacturing | 0 | — | F |
| Onyett Fabricators, LLC IN | Manufacturing | 0 | — | A |
| ONYX CAPITAL TEQUILA PARTNERS IV LLC TX | Manufacturing | 0 | — | F |
| Onyx Engineering Inc. TX | Professional & Technical Services | 0 | — | A |
| Onyx Paving Company Inc CA | Construction | 0 | — | A |
| Onyx Pharmaceuticals, Inc CA | — | 0 | — | — |
| Onyx Resource Services, LLC TX | Professional & Technical Services | 0 | — | A |
| Onyx Safety Services, LLC TX | Professional & Technical Services | 0 | — | A |
| Onyx Specialty Papers MA | Manufacturing | 0 | — | F |
| Onyx Technology, LLC KS | Professional & Technical Services | 1 | $117,749 | — |
| Onyx Venus Global LLC CA | Transportation & Warehousing | 0 | — | F |
| Onyx+East IN | Construction | 0 | — | A |
| OnyxMP GrowthCo Inc. TX | Retail Trade | 1 | $160,000 | — |
| OOBE Apparel Design Group SC | Manufacturing | 0 | — | A |
| Oodle AI, Inc. CA | Professional & Technical Services | 1 | $200,000 | — |
| Ooma, Inc. CA | Professional & Technical Services | 1 | $140,000 | — |
| Oorvi Systems Inc TX | Professional & Technical Services | 1 | $85,000 | — |
| Oostburg Concrete Products WI | Construction | 0 | — | F |
| OOTB Minds, Inc. DC | Professional & Technical Services | 4 | $123,876 | — |
| Oour Lady of Bellefonte Hospital, L.L.C. KY | — | 0 | — | — |
