| X split history United States Steel Corporation | NYSE | Basic Materials |
| XAA split history American Municipal Income Portfolio Inc | NYSE | Financials |
| XATA split history XATA Corporation | NASDAQ | Technology |
| XBKS split history Xenith Bankshares Inc | NASDAQ | Financials |
| XCO split history EXCO Resources Inc | NYSE | Energy |
| XCRA split history Xcerra Corp | NASDAQ | Industrials |
| XEC split history Cimarex Energy Co | NYSE | Energy |
| XEL split history Xcel Energy Inc | NYSE | Utilities |
| XENT split history Intersect ENT Inc | NASDAQ | Healthcare |
| XETA split history XETA Technologies, Inc. | NASDAQ | Technology |
| XFN split history Xfone, Inc. | AMEX | Services |
| XGTI split history xG Technology Inc | NASDAQ | Technology |
| XIDE split history Exide Technologies | NASDAQ | Technology |
| XIN split history Xinyuan Real Estate Co., Ltd. (ADR) | NYSE | Financials |
| XING split history Qiao Xing Universal Telephone, Inc. | NASDAQ | Technology |
| XJT split history ExpressJet Holdings, Inc. | NYSE | Industrials |
| XL split history XL Group plc | NYSE | Financials |
| XLNX split history Xilinx, Inc. | NASDAQ | Technology |
| XLRN split history Acceleron Pharma Inc | NASDAQ | Healthcare |
| XLS split history Exelis Inc | NYSE | Industrials |
| XNCR split history Xencor Inc | NASDAQ | Healthcare |
| XNET split history Xunlei Ltd | NASDAQ | Technology |
| XNN split history Xenonics Holdings Inc | AMEX | Technology |
| XNPT split history XenoPort, Inc. | NASDAQ | Healthcare |
| XNY split history China Xiniya Fashion Ltd (ADR) | NYSE | Cyclical Consumer Goods & Services |
| XOM split history Exxon Mobil Corporation | NYSE | Energy |
| XOMA split history XOMA Corp | NASDAQ | Healthcare |
| XON split history Intrexon Corp | NYSE | Healthcare |
| XONE split history ExOne Co | NASDAQ | Industrials |
| XOOM split history Xoom Corp | NASDAQ | Industrials |
| XOXO split history XO Group Inc | NYSE | Non-Cyclical Consumer Goods & Services |
| XPL split history Solitario Exploration & Royalty Co (USA) | NYSEMKT | Basic Materials |
| XPLR split history Xplore Technologies Corp. | NASDAQ | Technology |
| XPO split history XPO Logistics Inc | NYSE | Industrials |
| XPRT split history LECG Corporation | NASDAQ | Non-Cyclical Consumer Goods & Services |
| XRA split history Exeter Resource Corp. | NYSEMKT | Basic Materials |
| XRAY split history DENTSPLY International Inc. | NASDAQ | Healthcare |
| XRIT split history X-Rite, Incorporated | NASDAQ | Technology |
| XRM split history Xerium Technologies, Inc. | NYSE | Cyclical Consumer Goods & Services |
| XRS split history TAL Education Group (ADR) | NYSE | Non-Cyclical Consumer Goods & Services |
| XRSC split history XRS Corp | NASDAQ | Industrials |
| XRTX split history Xyratex Ltd. | NASDAQ | Technology |
| XRX split history Xerox Corp | NYSE | Industrials |
| XSEL split history Xinhua Sports & Entertainment Ltd (ADR) | NASDAQ | Services |
| XTEX split history Crosstex Energy, L.P. | NASDAQ | Energy |
| XTLB split history X T L Biopharmaceuticals Ltd (ADR) | NASDAQ | Healthcare |
| XTO split history XTO Energy Inc. | NYSE | Energy |
| XTXI split history Crosstex Energy Inc | NASDAQ | Energy |
| XUE split history Xueda Education Group (ADR) | NYSE | Non-Cyclical Consumer Goods & Services |
| XWES split history World Energy Solutions, Inc. | NASDAQ | Financials |
| XXIA split history Ixia | NASDAQ | Technology |
| XXII split history 22nd Century Group Inc | NYSEMKT | Basic Materials |
| XYL split history Xylem Inc | NYSE | Industrials |