| Oak Ridge Schools TN | Educational Services | 0 | — | C |
| Oak Ridge Services Inc. VA | Construction | 0 | — | A |
| Oak Ridge Utility District TN | Utilities | 0 | — | A |
| Oak Ridge Waste & Recycling CT | Administrative & Waste Services | 0 | — | F |
| Oak Ridge Waste & Recycling of CT LLC CT | Administrative & Waste Services | 0 | — | F |
| Oak River Farms Inc CA | Agriculture & Forestry | 0 | — | A |
| Oak River Insurance Company CA | Professional & Technical Services | 3 | $178,073 | — |
| Oak Run Associates FL | Construction | 0 | — | A |
| Oak Spring Inc. FL | Accommodation & Food Services | 0 | — | F |
| Oak Springs Nursery CA | Administrative & Waste Services | 0 | — | A |
| Oak Street Health MSO LLC RI | Retail Trade | 1 | $151,885 | — |
| Oak Street Health MSO, LLC IL | Healthcare & Social Assistance | 10 | $122,690 | — |
| Oak Street Manufacturing IA | Manufacturing | 0 | — | F |
| Oak Technologies Inc. TX | Professional & Technical Services | 3 | $98,121 | — |
| Oak Terrace Assisted Living of North Mankato MN | Healthcare & Social Assistance | 0 | — | F |
| OAK TERRACE SENIOR HOUSING JORDAN MN | Healthcare & Social Assistance | 0 | — | F |
| OAK TERRACE SENIOR HOUSING LESUER MN | Healthcare & Social Assistance | 0 | — | A |
| Oak Valley Hospital District CA | Healthcare & Social Assistance | 0 | — | F |
| Oak Valley Hotel, LLC CA | Accommodation & Food Services | 0 | — | F |
| Oak View Animal Hospital, PLLC AL | Professional & Technical Services | 1 | $250,000 | — |
| Oak View Auto Auction LA | Wholesale Trade | 0 | — | A |
| Oak View Group OH | — | 0 | — | — |
| Oak View Group PA | — | 0 | — | — |
| Oak View Group - at McCormick Place IL | — | 0 | — | — |
| Oak View Group LLC CA | Professional & Technical Services | 1 | $200,000 | — |
| Oak View Group OVG360 OK | Arts & Entertainment | 0 | — | A |
| Oak View Group, LLC TX | Administrative & Waste Services | 0 | — | A |
| Oak Village Healthcare IN | Healthcare & Social Assistance | 0 | — | F |
| Oak Wells Aquatics FL | Construction | 0 | — | F |
| Oak-It, Inc. CA | Manufacturing | 0 | — | F |
| Oak-Leyden Developmental Services IL | Healthcare & Social Assistance | 0 | — | F |
| Oak-Mitsui Technologies, LLC NY | — | 0 | — | — |
| Oak-Mitsui, Inc. NY | — | 0 | — | — |
| OakBend Medical Center TX | Healthcare & Social Assistance | 0 | — | B |
| Oakbrook WI | Real Estate | 0 | — | A |
| Oakbrook Center IL | Real Estate | 0 | — | F |
| Oakbrook Health and Rehab SC | Healthcare & Social Assistance | 0 | — | F |
| Oakbrook Health and Rehabilitation WI | Healthcare & Social Assistance | 0 | — | F |
| Oakbrook Operations, LLC FL | Healthcare & Social Assistance | 0 | — | C |
| Oakbrook Terrace Fire Protection District IL | Agriculture & Forestry | 0 | — | A |
| Oakcraft,1nc AZ | Manufacturing | 0 | — | F |
| Oakcrest Lumber Inc. GA | Manufacturing | 0 | — | F |
| Oakcrest Lumber Inc. TN | Manufacturing | 0 | — | F |
| Oakdale Community Hospital LA | Healthcare & Social Assistance | 0 | — | D |
| Oakdale Ear, Nose & Throat Clinic MN | Administrative & Waste Services | 0 | — | A |
| Oakdale Ear, Nose & Throat Clinic PA MN | Healthcare & Social Assistance | 0 | — | F |
| Oakdale Nursing OpCo LLC AR | Healthcare & Social Assistance | 0 | — | A |
| Oakdale Veterinary Center IL | Professional & Technical Services | 0 | — | A |
| Oakes & Parkhurst Glass, Inc. ME | Construction | 0 | — | F |
| Oakes Community Hospital ND | Healthcare & Social Assistance | 1 | $65,998 | — |
