| Y | Alleghany Corp. | YGE | Yingli Green Energy Holding Co. Ltd. | YRCW | YRC Worldwide Inc. |
| YAO | Claymore/AlphaShares China All-Cap ETF | YHOO | Yahoo! Inc. | YSI | U-STORE-IT TRUST |
| YAVY | Yadkin Valley Financial Corp. | YMI | YM BioSciences Inc. | YTEC | Yucheng Technologies Limited |
| YCL | ProShares Ultra Yen | YONG | Yongye Intl | YUM | Yum! Brands Inc. |
| YCS | ProShares UltraShort Yen | YORW | York Water Co. | YXI | ProShares Short FTSE Xinhua China 25 |
| YDNT | Young Innovations Inc. | YPF | YPF S.A. | YZC | Yanzhou Coal Mining Co. Ltd. |
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