| Oklahoma Coring & Cutting, Inc. OK | Construction | 0 | — | A |
| Oklahoma Electric Cooperative OK | Utilities | 0 | — | D |
| Oklahoma Electrical Supply Company OK | Construction | 0 | — | D |
| OKLAHOMA GAS & ELECTRIC CO AR | Utilities | 0 | — | C |
| OKLAHOMA GAS & ELECTRIC CO OK | Utilities | 0 | — | A |
| OKLAHOMA HOME CENTERS LLC OK | Retail Trade | 0 | — | A |
| Oklahoma Joe's NE | — | 0 | — | — |
| Oklahoma Medical Research Foundation OK | Professional & Technical Services | 8 | $53,755 | — |
| Oklahoma Natural Gas OK | Utilities | 0 | — | A |
| Oklahoma Panhandle State University OK | Educational Services | 3 | $43,150 | — |
| Oklahoma Philharmonic Society, Inc OK | Arts & Entertainment | 1 | $61,173 | — |
| Oklahoma roofing and sheet metal OK | Construction | 0 | — | F |
| Oklahoma Safety Equipment Company OK | Manufacturing | 0 | — | B |
| Oklahoma Shirt Company OK | Manufacturing | 0 | — | A |
| Oklahoma Spine Hospital OK | Healthcare & Social Assistance | 0 | — | A |
| Oklahoma State Bureau of Investigation OK | Administrative & Waste Services | 1 | $92,266 | — |
| Oklahoma State Fair, Inc. OK | Accommodation & Food Services | 0 | — | F |
| Oklahoma State University OK | Educational Services | 28 | $75,580 | — |
| Oklahoma Steel & Wire OK | Manufacturing | 0 | — | F |
| Oklahoma Waterproofing Co OK | Construction | 0 | — | F |
| Oklahoma Wesleyan University OK | Educational Services | 3 | $38,975 | — |
| Okland Construction UT | Construction | 0 | — | B |
| Okoboji Motor Company IA | Retail Trade | 0 | — | A |
| Okon Metals Inc. TX | Administrative & Waste Services | 0 | — | A |
| Okon Recycling TX | Administrative & Waste Services | 0 | — | A |
| OKOS Solutions LLC VA | Manufacturing | 0 | — | A |
| Oksenholt Hospitality - Meredith Lodgin OR | — | 0 | — | — |
| Oksenholt Hospitality Company - Meredit OR | — | 0 | — | — |
| Oksenholt Hospitality Company - Mojo Re OR | — | 0 | — | — |
| Okta, Inc. CA | Professional & Technical Services | 80 | $171,610 | — |
| Oktibbeha County Co-op MS | Wholesale Trade | 0 | — | F |
| Oktibbeha County Cooperative -AAL- MS | Wholesale Trade | 0 | — | C |
| Okuma Fishing Tackle Corp CA | Wholesale Trade | 0 | — | C |
| OKURA USA INC FL | Wholesale Trade | 0 | — | F |
| OL Frontal Solutions IN | Manufacturing | 0 | — | F |
| Olaf Anderson Construction Company ND | Construction | 0 | — | D |
| Olaguez Family LLC CA | Wholesale Trade | 0 | — | F |
| Olam Agri Americas - Richardson HQ TX | Management of Companies | 0 | — | F |
| Olam Agri Americas, inc. AZ | Agriculture & Forestry | 0 | — | A |
| Olam Agri Americas, Inc. CA | Agriculture & Forestry | 0 | — | A |
| Olam Agri Americas, Inc. MS | Transportation & Warehousing | 0 | — | A |
| Olam Agri Americas, Inc. TX | Transportation & Warehousing | 0 | — | A |
| Olam Americas NM | Manufacturing | 0 | — | C |
| Olam Americas LLC IL | Manufacturing | 0 | — | F |
| Olam Americas, LLC CA | Manufacturing | 8 | $180,631 | C |
| Olam Farming Inc. CA | Agriculture & Forestry | 0 | — | A |
| Olam Food Ingredients AL | Agriculture & Forestry | 0 | — | B |
| Olam Peanut Shelling Co. GA | Agriculture & Forestry | 0 | — | C |
| Olam Spices CA | Agriculture & Forestry | 0 | — | F |
| Olam Spices & Vegetables CA | — | 0 | — | — |
