| OTRXpress LLC TN | Transportation & Warehousing | 0 | — | F |
| OTS LOGISTICS KY | Transportation & Warehousing | 0 | — | A |
| OTS Solutions Inc TX | Professional & Technical Services | 3 | $91,582 | — |
| OTS Solutions, LLC CA | — | 0 | — | — |
| OTS Solutions, LLC dba On Time Staffing CA | — | 0 | — | — |
| Otsar Early Childhood Center NY | — | 0 | — | — |
| OTSC Services, LLC TX | Construction | 0 | — | A |
| OTSCON MO | — | 0 | — | — |
| Otsego County Ambulance Corps inc MI | Healthcare & Social Assistance | 0 | — | A |
| Otsego Electric Cooperative, Inc. NY | Utilities | 0 | — | F |
| Otsego Ready Mix, Inc. NY | Manufacturing | 0 | — | F |
| Otsuka America Pharmaceutical, Inc. NJ | Manufacturing | 5 | $199,274 | — |
| Otsuka America Pharmaceutical, Inc. (OAPI) NJ | Wholesale Trade | 0 | — | A |
| Otsuka America Pharmaceutical, Inc. Hayward (OAPI-Hayward) CA | Wholesale Trade | 0 | — | A |
| Otsuka Pharmaceutical Development & Commercialization, Inc. NJ | Manufacturing | 4 | $166,009 | — |
| Otsuka Pharmaceutical Development and Commercialization, Inc. (OPDC) MD | Wholesale Trade | 0 | — | A |
| OTT Concrete Construction NE | Construction | 0 | — | A |
| OTT HYDROMET CORPORATION VA | Manufacturing | 1 | $106,162 | — |
| Ott Law Firm, LLC MO | Professional & Technical Services | 1 | $69,500 | — |
| Ott Scientific NJ | Manufacturing | 0 | — | A |
| Ottawa Cooperative Association KS | Wholesale Trade | 0 | — | B |
| Ottawa County MI | Public Administration | 0 | — | C |
| Ottawa County Central Dispatch Authority MI | Administrative & Waste Services | 0 | — | A |
| Ottawa County Road Commission MI | Construction | 0 | — | F |
| Ottawa Dental Laboratory, LLC IL | Manufacturing | 0 | — | C |
| Ottawa Dental Laboratory, LLC IN | Manufacturing | 0 | — | A |
| Ottawa Dental Laboratory, LLC WI | Manufacturing | 0 | — | A |
| Ottawa Friendship House IL | Healthcare & Social Assistance | 0 | — | D |
| Ottawa Innovations LLC MI | Wholesale Trade | 0 | — | F |
| Ottawa Lake Co-Op Elevator Company MI | Wholesale Trade | 0 | — | A |
| Ottawa Rubber Company OH | Manufacturing | 0 | — | F |
| Ottawa University KS | Educational Services | 4 | $59,949 | — |
| Otten Bros. Nursery & Landscaping, Inc. MN | Retail Trade | 0 | — | A |
| Otten Brothers Nursery & Landscaping, Inc. MN | Retail Trade | 0 | — | C |
| Ottenweller Company NC | Manufacturing | 0 | — | F |
| Ottenweller Company, Inc. IN | Manufacturing | 0 | — | F |
| Otter Lake Technologies MN | Manufacturing | 0 | — | A |
| Otter Products LLC CA | Manufacturing | 0 | — | A |
| Otter Products LLC CO | Manufacturing | 0 | — | C |
| Otter Tail Power Company MN | Utilities | 0 | — | A |
| Otter Tail Power Company ND | Utilities | 0 | — | B |
| Otter Tail Power Company SD | Utilities | 0 | — | A |
| OTTER.AI, INC. CA | Information & Media | 10 | $174,858 | — |
| Otterbein Home OH | Healthcare & Social Assistance | 0 | — | F |
| Otterbein Homes IN | Healthcare & Social Assistance | 0 | — | F |
| Otterbein Homes OH | Healthcare & Social Assistance | 0 | — | F |
| Otterbein University OH | Educational Services | 1 | $71,500 | — |
| Ottertail Corporation AZ | Manufacturing | 0 | — | A |
| Ottertail County Ind School Dist #542 MN | Educational Services | 0 | — | A |
| Ottery Transportation Inc WI | Transportation & Warehousing | 0 | — | D |
