| Ohio Mulch Supply OH | Manufacturing | 0 | - | D |
| Ohio Northern University OH | Educational Services | 2 | $67,500 | - |
| Ohio Public Employees Retirement System OH | Finance & Insurance | 1 | $88,962 | - |
| Ohio Recovery Center OH | - | 0 | - | - |
| Ohio Retail Security & Mainstreet Maint. FL | - | 0 | - | - |
| Ohio River Laboratories, LLC OH | Professional & Technical Services | 1 | $140,000 | - |
| Ohio River Laboratories, LLC TX | Professional & Technical Services | 1 | $140,000 | - |
| Ohio Star Forge Co OH | Manufacturing | 0 | - | F |
| Ohio State Dental Faculty Practice, Inc. OH | Healthcare & Social Assistance | 3 | $149,989 | - |
| Ohio Steel Industries, Inc. OH | Manufacturing | 0 | - | F |
| Ohio Valley Bistro's Inc. (TGI Friday's at the Pittsburgh Airport) PA | - | 0 | - | - |
| Ohio Valley Coal Company Powhatan No. 6 Mine OH | - | 0 | - | - |
| Ohio Valley Electric Corporation OH | Utilities | 0 | - | F |
| Ohio Valley Gas IN | Utilities | 0 | - | F |
| Ohio Valley Manufacturing OH | Manufacturing | 0 | - | F |
| Ohio Valley Medical Center WV | - | 0 | - | - |
| Ohio Valley Transloadling Company OH | - | 0 | - | - |
| Ohio Valley Waste Services, Inc. OH | Administrative & Waste Services | 0 | - | F |
| Ohio Valley Wine OH | Wholesale Trade | 0 | - | F |
| OhioHealth Corp. OH | Healthcare & Social Assistance | 19 | $77,814 | D |
| OhioHealth Physician Group, Inc. OH | Healthcare & Social Assistance | 6 | $341,866 | - |
| Ohiopyle Prints, Inc. PA | Manufacturing | 0 | - | F |
| Ohk Global INC TX | Retail Trade | 1 | $60,500 | - |
| OHLA Building, Inc. FL | Professional & Technical Services | 1 | $91,229 | A |
| Ohla USA, INC CA | Construction | 0 | - | F |
| OHLA USA, Inc. NY | Professional & Technical Services | 3 | $101,725 | A |
| Ohm Laboratories, Inc. NJ | Manufacturing | 3 | $112,333 | - |
| OHM Specialty Pharmacy LLC MI | Retail Trade | 1 | $100,000 | - |
| OIA Global KY | - | 0 | - | - |
| OIA Global NV | - | 0 | - | - |
| Oiae Systems LLC. FL | Professional & Technical Services | 2 | $88,750 | - |
| Oil City Iron Works Inc. TX | Manufacturing | 0 | - | F |
| Oil Creek Plastics PA | Manufacturing | 0 | - | F |
| Oil Search (Alaska) LLC AK | Mining & Extraction | 3 | $231,333 | - |
| Oil States Industries, INC. TX | Manufacturing | 0 | - | F |
| Oiles America Corporation NC | Manufacturing | 0 | - | F |
| Oilfield Trucking Solutions, a subsidiary of Seventy Seven Energy, Inc. TX | - | 0 | - | - |
| Oilstop LLC CA | Other Services | 0 | - | F |
| Oishii Farm Corporation CA | - | 0 | - | - |
| Oishii Farm Corporation NJ | Agriculture & Forestry | 1 | $92,978 | A |
| OJ Insulation, LP CA | Construction | 0 | - | F |
| Ojai Valley Inn CA | - | 0 | - | - |
| Ojus LLC. NJ | Professional & Technical Services | 1 | $95,680 | - |
| OJV Construction CA | Manufacturing | 0 | - | F |
| OK Foods AL | Manufacturing | 0 | - | A |
| OK Foods OK | Manufacturing | 0 | - | C |
| Ok Foods, INC. AR | Manufacturing | 0 | - | D |
| OK International, Inc. CA | Manufacturing | 1 | $98,918 | - |
| OK Tire Store Inc ND | Retail Trade | 0 | - | C |
| Okami, Inc. CA | - | 0 | - | - |
