- YMI
- YM BIOSCIENCES INC
- YORW
- The York Water Company
- YAVY
- Yadkin Valley Financial Corporation
- YHOO
- Yahoo! Inc.
- YNDX
- Yandex N.V.
- YONG
- Yongye International, Inc.
- YOD
- You On Demand Holdings, Inc.
- YRCW
- YRC Worldwide, Inc.
- YY
- YY Inc.
- YEWTF
- Environmental Waste International Inc
- YDVL
- Yadkin Valley Corp
- YAHOY
- Yahoo Japan Corp
- YAHOF
- Yahoo Japan Corp
- YRLLF
- Yale Resources Ltd
- YAMHF
- YAMAHA MOTOR ORD
- YATRY
- Yamato Holdings Co Ltd
- YOOIF
- Yangaroo Inc
- YSYB
- Yanglin Soybean
- YSHLF
- Yangzijiang Shipbuilding Holdings Ltd
- YNAJF
- Yantai North Andre Juice Co Ltd
- YARIY
- YARA INT SP ADR
- YHGG
- YASHENG GROUP
- YYIN
- Yayi Internatnal
- YLWPF
- YELLOW PAGES INC FD
- YCKM
- Yellowcake Minin
- YESD
- YesDTC Holdings Inc
- YIPI
- Yippy Inc
- YIPCF
- Yips Hang Cheung Ord
- YOCM
- Yocream Intl Inc
- YOHOF
- Yoho Res Inc
- YBLT
- Youblast Global
- YDNT
- Young Innovations Inc
- YTBLA
- YTB International Inc
- YTBLB
- YTB International Inc
- YTEC
- Yucheng Technologies Ltd
- YUEIY
- Yue Yuen Industrial Holdings Ltd
- YUEIF
- Yue Yuen Industrial Holdings Ltd
- YUII
- Yuhe Intl Inc
- YNGFF
- Yukon-Nevada Gold Corp
- Y
- Alleghany Corporation
- YZC
- Yanzhou Coal Mining Company Limited
- YELP
- Yelp Inc.
- YGE
- Yingli Green Energy Holding Company Limited
- YOKU
- Youku Tudou Inc.
- YPF
- YPF Sociedad Anonima
- YUM
- Yum! Brands, Inc.
- YAO
- Claymore/AlphaShares China All-Cap ETF
- YXI
- ProShares Short FTSE Xinhua China 25
- YCL
- ProShares Ultra Yen
- YCS
- ProShares UltraShort Yen
- YSI
- U-STORE-IT TRUST