| ZANE | Zanett Inc. | ZINC | Horsehead Holding Corp. | ZOOMD | Zoom Technlgies |
| ZAP | Zapata Corp. | ZION | Zions Bancorp. | ZQK | Quiksilver Inc. |
| ZBB | ZBB Energy Corporation | ZIOP | ZIOPHARM Oncology, Inc. | ZRAN | Zoran Corp. |
| ZBRA | Zebra Technologies Corp. | ZIPR | zipRealty Inc. | ZRBA | Zareba Systems Inc. |
| ZEP | Zep, Inc. | ZIXI | Zix Corp. | ZROZ | PIMCO 25+ Year Zero Coupon US Treasury I |
| ZEUS | Olympic Steel Inc. | ZLC | Zale Corporation | ZSL | ProShares UltraShort Silver |
| ZF | Zweig Fund Inc. | ZMH | Zimmer Holdings Inc. | ZSTN | ZST Digital Networks Inc |
| ZGEN | ZymoGenetics, Inc. | ZN | Zion Oil & Gas Inc. | ZTR | Zweig Total Return Fund Inc. |
| ZHNE | Zhone Technologies Inc. | ZNH | China Southern Airlines Co. Ltd. | ZUMZ | Zumiez, Inc. |
| ZHNED | Zhone Technlgs | ZNT | Zenith National Insurance Corp. | ZZ | Sealy Corp. |
| ZIGO | Zygo Corp. | ZOLL | ZOLL Medical Corp. | ZZC | SEALY CORPORATION |
| ZILA | Zila, Inc. | ZOLT | Zoltek Companies Inc. | ||
| ZILG | Zilog Inc. | ZOOM | ZOOM Technologies Inc. |
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