| Order of the Eastern Star - South Dakota SD | Healthcare & Social Assistance | 0 | — | F |
| Orders Construction Company, Inc. WV | Construction | 0 | — | C |
| Orders Services LLC SC | Construction | 0 | — | A |
| OrderUp (a subsidiary of Groupon) MD | — | 0 | — | — |
| Ordes Electric, Inc. LA | Construction | 0 | — | A |
| Ordnance Technology Service, Inc. OH | Manufacturing | 0 | — | A |
| Ordner Construction GA | Construction | 0 | — | A |
| Ordr, Inc. CA | Information & Media | 2 | $195,146 | — |
| Ordway Center for the Performing Arts MN | Arts & Entertainment | 0 | — | D |
| Ordway Corporation CA | Wholesale Trade | 0 | — | A |
| Ordway Research Institute Inc. NY | — | 0 | — | — |
| Oreck TN | — | 0 | — | — |
| Oregon Advanced Imaging LLC OR | Healthcare & Social Assistance | 0 | — | F |
| Oregon Aerial Construction LLC OR | Construction | 0 | — | F |
| Oregon Aero OR | Manufacturing | 0 | — | D |
| Oregon Anesthesiology Group OR | Healthcare & Social Assistance | 0 | — | A |
| Oregon Berry Packing, Inc. OR | Agriculture & Forestry | 0 | — | F |
| Oregon Bolt OR | Wholesale Trade | 0 | — | A |
| Oregon Canadian Forest Products OR | Manufacturing | 0 | — | F |
| OREGON CASCADE BUILDING MATERIALS OR | Manufacturing | 0 | — | A |
| Oregon Cascade Plumbing & Heating, Inc. OR | Construction | 0 | — | F |
| Oregon Cascades West Council of Governments OR | Public Administration | 0 | — | A |
| Oregon Clean Energy LLC OH | Utilities | 0 | — | A |
| Oregon Coast Aquarium OR | Arts & Entertainment | 0 | — | C |
| OREGON COAST COMMUNITY ACTION OR | Healthcare & Social Assistance | 0 | — | F |
| Oregon Conference of Seventh-day Adventists OR | Other Services | 1 | $54,960 | — |
| Oregon Corrections Enterprises OR | Other Services | 0 | — | B |
| Oregon County Sheltered Workshop MO | Healthcare & Social Assistance | 0 | — | A |
| Oregon Custom Cabinets, Inc OR | Manufacturing | 0 | — | F |
| Oregon Dairy PA | Retail Trade | 0 | — | A |
| Oregon Department of Forestry OR | Agriculture & Forestry | 0 | — | B |
| Oregon Department of Human Services OR | Healthcare & Social Assistance | 0 | — | A |
| Oregon Department of Transportation OR | Public Administration | 0 | — | C |
| Oregon Employment Department OR | Public Administration | 0 | — | A |
| Oregon Endoscopy Center OR | Healthcare & Social Assistance | 0 | — | F |
| Oregon Fire Protection District IL | Public Administration | 0 | — | A |
| Oregon Harvesting Inc OR | Agriculture & Forestry | 0 | — | A |
| Oregon Health & Science University OR | Educational Services | 67 | $149,135 | C |
| Oregon Health & Science University (OHSU) OR | — | 0 | — | — |
| OREGON HEALTH AND SCIENCE UNIVERSITY OR | Educational Services | 2 | $301,500 | — |
| Oregon Health and Science Unviersity OR | Educational Services | 1 | $240,178 | — |
| Oregon Health Authority OR | Public Administration | 0 | — | A |
| Oregon Healthcare, LLC MO | Healthcare & Social Assistance | 0 | — | F |
| Oregon Heating & Air Conditioning, LLC OR | Construction | 0 | — | F |
| Oregon Historical Society OR | Arts & Entertainment | 0 | — | A |
| Oregon Ice Cream LLC OR | Manufacturing | 0 | — | F |
| Oregon Ice Cream LLC WA | Manufacturing | 0 | — | A |
| Oregon Industrial Lumber Products OR | Manufacturing | 0 | — | F |
| Oregon Institute of Technology OR | Educational Services | 4 | $78,877 | — |
| Oregon International Port of Coos Bay OR | Transportation & Warehousing | 0 | — | C |
