| Abbreviation | Definition |
|---|---|
| OPTH | Optimum Human Performance Centers |
| OPTI | Opti, Inc. |
| OPTK | Optika, Inc. |
| OPTL | Optisystems Solutions, LTD. |
| OPTLW | Optisystems Solutions, LTD. Warrants |
| OPTLW | Optisystems Solutions, LTD. Warrants (de-listed) |
| OPTLW | Optisystems Solutions, LTD. Warrants (de-listed) |
| OPTMQ | Opto Mechanik, Inc. (in bankruptcy) |
| OPTN | Option Care, Inc. |
| OPTO | Optio Software |
| OPTQD | Ocean Optique Distributors, Inc. |
| OPTS | Opta Food Ingredients, Inc. |
| OPTV | OpenTV Group |
| OPTX | NetOptix Corporation |
| OPWR | Ocean Power Corporation |
| OPWR | OnLine Power Supply, Inc. |
| ORAE | ORA Electronics, Inc. |
| ORAEH | ORA Electronics, Inc. |
| ORAEI | ORA Electronics, Inc. |
| ORAEW | ORA Electronics, Inc. Warrants |