| Abbreviation | Definition |
|---|---|
| QCSB | Queens County Bancorp, Inc. |
| QCSB | Queens County Bancorp, Incorporated (de-listed) |
| QCSB | Queens County Bancorp, Incorporated (de-listed) |
| QDEL | Quidel Corporation |
| QDELW | Quidel Corporation Warrants |
| QDELW | Quidel Corporation Warrants (de-listed) |
| QDELW | Quidel Corporation Warrants (de-listed) |
| QDIN | Quality Dining, Inc. |
| QDIN | Quality Dining, Incorporated (de-listed) |
| QDIN | Quality Dining, Incorporated (de-listed) |
| QDLCE | Quadlogic Controls Corporation |
| QDRMY | Banca Quadrum, S. A. |
| QDXC | Quadrax Corporation |
| QEDC | Quest Education Corporation |
| QEDI | Quantum Effect Devices, Inc. |
| QEKG | Q Med, Inc. |
| QEPC | Q E P Company, Inc. |
| QFAB | Quaker Fabric Corporation |
| QGENF | Qiagen, N. V. |
| QGLY | Quigley Corporation |