| O'Reilly Auto Parts MA | Retail Trade | 0 | - | F |
| O'Reilly Auto Parts MI | Retail Trade | 0 | - | C |
| O'Reilly Auto Parts MN | Retail Trade | 0 | - | D |
| O'Reilly Auto Parts MO | Retail Trade | 0 | - | F |
| O'Reilly Auto Parts MS | Retail Trade | 0 | - | D |
| O'Reilly Auto Parts NC | Retail Trade | 0 | - | D |
| O'Reilly Auto Parts OH | Retail Trade | 0 | - | B |
| O'Reilly Auto Parts OK | Retail Trade | 0 | - | B |
| O'Reilly Auto Parts TN | Retail Trade | 0 | - | D |
| O'Reilly Auto Parts TX | Retail Trade | 0 | - | C |
| O'Reilly Auto Parts UT | Retail Trade | 0 | - | F |
| O'Reilly Auto Parts WA | Retail Trade | 0 | - | F |
| O'Reilly Automotive Stores, Inc AL | Retail Trade | 0 | - | D |
| O'Reilly Automotive Stores, Inc AZ | Retail Trade | 0 | - | F |
| O'Reilly Automotive Stores, Inc CA | Retail Trade | 0 | - | F |
| O'Reilly Automotive Stores, Inc CO | Retail Trade | 0 | - | D |
| O'Reilly Automotive Stores, Inc FL | Retail Trade | 0 | - | F |
| O'Reilly Automotive Stores, Inc GA | Retail Trade | 0 | - | D |
| O'Reilly Automotive Stores, Inc IA | Retail Trade | 0 | - | F |
| O'Reilly Automotive Stores, Inc IL | Retail Trade | 0 | - | D |
| O'Reilly Automotive Stores, Inc IN | Retail Trade | 0 | - | F |
| O'Reilly Automotive Stores, Inc LA | Retail Trade | 0 | - | D |
| O'Reilly Automotive Stores, Inc MA | Transportation & Warehousing | 0 | - | F |
| O'Reilly Automotive Stores, Inc MI | Retail Trade | 0 | - | C |
| O'Reilly Automotive Stores, Inc MN | Retail Trade | 0 | - | F |
| O'Reilly Automotive Stores, Inc MO | Retail Trade | 0 | - | A |
| O'Reilly Automotive Stores, Inc MS | Retail Trade | 0 | - | F |
| O'Reilly Automotive Stores, Inc NC | Retail Trade | 0 | - | F |
| O'Reilly Automotive Stores, Inc OH | Retail Trade | 0 | - | C |
| O'Reilly Automotive Stores, Inc TN | Retail Trade | 0 | - | F |
| O'Reilly Automotive Stores, Inc TX | Retail Trade | 0 | - | D |
| O'Reilly Automotive Stores, Inc UT | Retail Trade | 0 | - | D |
| O'Reilly Automotive Stores, Inc WA | Retail Trade | 0 | - | F |
| O'Reilly Automotive, Inc. AZ | - | 0 | - | - |
| O'Reilly Hospitality Management CO | Accommodation & Food Services | 0 | - | F |
| O'Reilly Hospitality Management TX | Accommodation & Food Services | 0 | - | F |
| O(1) Labs Operating Corporation CA | Information & Media | 2 | $235,000 | - |
| O-AT-KA Milk Products NY | Manufacturing | 0 | - | F |
| O-I (Owens-Illinois, Inc./Owens-Brockway Glass Container, Inc.) TX | - | 0 | - | - |
| O.C. Jones & Sons, Inc. CA | Construction | 0 | - | F |
| O.C. Seacrets, Inc. MD | Accommodation & Food Services | 0 | - | C |
| O.C. Tanner Company UT | Manufacturing | 2 | $135,506 | - |
| O.E.C. Shipping Los Angeles, Inc. CA | Professional & Technical Services | 2 | $63,000 | - |
| O.E.S. Equipment, LLC TX | Real Estate | 1 | $98,509 | - |
| O.M.G Entertainment CA | Professional & Technical Services | 2 | $74,880 | - |
| O.P.E.N. America, Inc. dba: OpenWorks AZ | - | 0 | - | - |
| O.P.H Laguna Hills, Inc. dba The Original Pancake House CA | - | 0 | - | - |
| O.P.H. - R.B., Inc., The Original Pancake House CA | - | 0 | - | - |
| O.P.I. Products Inc. CA | - | 0 | - | - |
| O.R. Builders Inc. CA | Construction | 0 | - | F |