| Abbreviation | Definition |
|---|---|
| PYSU | Polymer Solutions, Inc., N. V. |
| PYTV | T V Filme, Inc. |
| PYTV | TV Filme, Incorporated (de-listed) |
| PYTV | TV Filme, Incorporated (de-listed) |
| PZZA | Papa Johns International, Inc. |
| PZZA | Papa John's International, Incorporated |
| PZZI | Pizza Inn, Inc. |
| QADA | QAD, Inc. Class A |
| QADB | QAD, Inc. Class B |
| QADI | Q A D, Inc. |
| QAN | Queensland And Northern Territory Aerial Services Limited |
| QANT | Quantech Electronics Corporation |
| QANT | Quantech Electronics Corporation (de-listed) |
| QANT | Quantech Electronics Corporation (de-listed) |
| QBAK | Qualstar Corporation (de-listed) |
| QBIO | Quest Biotechnology, Incorporated (de-listed) |
| QBIOE | Quest Biotechnology, Inc. |
| QBIOE | Quest Biotechnology, Incorporated (de-listed) |
| QBIOE | Quest Biotechnology, Incorporated (de-listed) |
| QCBC | Quaker City Bancorp, Inc. |