| Oak Grove Institute Foundation, Inc. CA | Healthcare & Social Assistance | 0 | - | A |
| Oak Grove Racing Gaming & Hotel KY | Arts & Entertainment | 0 | - | A |
| Oak Grove School District CA | Educational Services | 6 | $66,630 | - |
| Oak Hammock at the University of Florida, Inc. FL | Healthcare & Social Assistance | 0 | - | F |
| Oak Harbor Freight Lines CA | Transportation & Warehousing | 0 | - | F |
| Oak Harbor Freight Lines NV | Transportation & Warehousing | 0 | - | D |
| Oak Harbor Freight Lines OR | Transportation & Warehousing | 0 | - | F |
| Oak Harbor Freight Lines WA | Transportation & Warehousing | 0 | - | F |
| Oak Health Care Investors of North Carolina, INC NC | Healthcare & Social Assistance | 0 | - | F |
| Oak Health Care Investors of Richmond, Virginia, INC VA | Healthcare & Social Assistance | 0 | - | F |
| Oak Hill CT | Healthcare & Social Assistance | 0 | - | F |
| Oak Hill Advisors, LP NY | Finance & Insurance | 6 | $200,000 | - |
| Oak Hill Capital Management LLC CT | Finance & Insurance | 1 | $150,000 | - |
| Oak Hill Country Club NY | Arts & Entertainment | 0 | - | F |
| Oak Hill Manor Nursing Home NY | Healthcare & Social Assistance | 0 | - | - |
| Oak Hills Nursing & Rehab Center OH | Healthcare & Social Assistance | 0 | - | F |
| Oak Leaf Engineering CORP. NJ | Professional & Technical Services | 1 | $49,920 | - |
| Oak Orchard Community Health Center, Inc. NY | - | 2 | $160,000 | - |
| Oak Point University IL | - | 0 | - | - |
| Oak Ridge Care Center WI | Healthcare & Social Assistance | 0 | - | F |
| Oak Ridge Nursing Center OK | Healthcare & Social Assistance | 0 | - | - |
| Oak Ridge Schools TN | Educational Services | 0 | - | C |
| 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 Insurance Company CA | Professional & Technical Services | 4 | $140,000 | - |
| Oak Springs Nursery CA | Administrative & Waste Services | 0 | - | A |
| Oak Street Health MSO LLC RI | Retail Trade | 12 | $146,574 | - |
| Oak Street Health MSO, LLC IL | Healthcare & Social Assistance | 10 | $122,690 | - |
| Oak Technologies Inc. TX | Professional & Technical Services | 3 | $98,121 | - |
| Oak Terrace Senior Housing Jordan MN | Healthcare & Social Assistance | 0 | - | F |
| Oak Thistle LLC NY | - | 1 | $113,131 | - |
| Oak Tree Ventures, LLC NJ | - | 1 | $103,210 | - |
| Oak Valley Hospital District CA | Healthcare & Social Assistance | 3 | $320,008 | F |
| Oak View Animal Hospital, PLLC AL | Professional & Technical Services | 1 | $250,000 | - |
| Oak View Animal Hospital, PLLC d/b/a Mission Pet Health AL | - | 1 | $145,000 | - |
| Oak View Group PA | - | 0 | - | - |
| Oak View Group OH | - | 0 | - | - |
| Oak View Group - at McCormick Place IL | - | 0 | - | - |
| Oak View Group LLC CA | Professional & Technical Services | 1 | $200,000 | - |
| Oak-It, Inc. CA | Manufacturing | 0 | - | F |
| Oak-Mitsui Technologies, LLC NY | - | 0 | - | - |
| Oak-Mitsui, Inc. NY | - | 0 | - | - |
| OakBend Medical Center TX | Healthcare & Social Assistance | 0 | - | B |
| 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 |
| Oakes Community Hospital ND | Healthcare & Social Assistance | 2 | $64,480 | - |
| Oakes Farms, Seed to Table FL | Retail Trade | 0 | - | A |
| Oakhurst Dairy ME | Manufacturing | 0 | - | F |