| Abbreviation | Definition |
|---|---|
| OKSB | Southwest Bancorp, Incorporated |
| OKSBO | Southwest Bancorp, Inc., of Oklahoma Capital Trust |
| OKSBO | Southwest Bancorp, Incorporated, Capital Trust (de-listed) |
| OKSBO | Southwest Bancorp, Incorporated, Capital Trust (de-listed) |
| OLAB | OraLabs Holdings Corporation |
| OLCMF | Olicom, A. S. |
| OLCWF | Olicom A/ S |
| OLDB | Old National Bancorp of Indiana |
| OLEX | Oilex, Inc. |
| OLGC | Orthologic Corporation |
| OLGR | Oilgear Company |
| OLOG | Offshore Logistics, Inc. |
| OLOG | Offshore Logistics, Incorporated (de-listed) |
| OLOG | Offshore Logistics, Incorporated (de-listed) |
| OLOGW | Offshore Logistics, Inc. Warrants |
| OLOGW | Offshore Logistics, Incorporated When issued (de-listed) |
| OLOGW | Offshore Logistics, Incorporated When issued (de-listed) |
| OLVTY | Olivetti Ing C & Company, S. P. A. |
| OLVXY | Olivetti Ing C & Company, S. P. A. |
| OLYOY | Olympus Optical Company, LTD. |