| Abbreviation | Definition |
|---|---|
| YTD | Year To Date |
| YUM | Tricon Global Restaurants |
| YZC | Yanzhou Coal Mining Company, LTD. |
| Z | Venator Group, Inc. |
| ZAP | Zapata Corporation of Nevada |
| ZBQ | Zebra Technologies |
| ZD | Ziff- Davis, Inc. |
| ZDZ | Ziff- Davis, Inc. |
| ZE | Zenith Electronics |
| ZF | Zweig Fund, Inc. |
| ZIF | Zenix Income Fund, Inc. |
| ZL | Zarlink Semiconductor, Inc. |
| ZL | Zarlink Semiconductor, Incorporated (de-listed) |
| ZL | Zarlink Semiconductor, Incorporated (de-listed) |
| ZLC | Zale Corporation |
| ZMX | Zemex Canada Corporation |
| ZNH | China Southern Airlines, LTD. |
| ZNT | Zenith National Insurance Corporation |
| ZQK | Quiksilver, Inc. |
| ZTR | Zweig Total Return Fund, Inc. |