| Y split history Alleghany Corporation | NYSE | Financials |
| YAVY split history Yadkin Valley Financial Corp. | NASDAQ | Financials |
| YDKN split history Yadkin Financial Corp | NYSE | Financials |
| YDLE split history Yodlee Inc | NASDAQ | Technology |
| YDNT split history Young Innovations, Inc. | NASDAQ | Healthcare |
| YELP split history Yelp Inc | NYSE | Cyclical Consumer Goods & Services |
| YGE split history Yingli Green Energy Hold. Co. Ltd. (ADR) | NYSE | Energy |
| YHOO split history Yahoo! Inc. | NASDAQ | Technology |
| YMI split history YM BioSciences Inc. (USA) | NYSEAMEX | Healthcare |
| YNDX split history Yandex NV | NASDAQ | Technology |
| YOD split history You On Demand Holdings, Inc. | NASDAQ | Cyclical Consumer Goods & Services |
| YOKU split history Youku Tudou Inc (ADR) | NYSE | Technology |
| YONG split history Yongye International Inc | NASDAQ | Basic Materials |
| YORW split history The York Water Company | NASDAQ | Utilities |
| YPF split history YPF SA (ADR) | NYSE | Energy |
| YRCW split history YRC Worldwide Inc | NASDAQ | Industrials |
| YSI split history U-Store-It Trust | NYSE | Services |
| YTEC split history Yucheng Technologies Limited | NASDAQ | Technology |
| YUII split history Yuhe International, Inc | NASDAQ | Non-Cyclical Consumer Goods & Services |
| YUM split history Yum! Brands, Inc. | NYSE | Cyclical Consumer Goods & Services |
| YUME split history YuMe Inc | NYSE | Technology |
| YY split history YY Inc (ADR) | NASDAQ | Technology |
| YZC split history Yanzhou Coal Mining Co Ltd (ADR) | NYSE | Energy |