- XRA
- Exeter Resource Corporation
- XPL
- Solitario Exploration & Royalty Corp
- XGC
- Claymore Great Compans Lrg Cp Grwth Indx
- XRO
- Claymore Zacks Sector Rotation
- XLY
- Consumer Discretionary Select Sector SPD
- XLP
- Consumer Staples Select Sector SPDR Fund
- XLE
- Energy Select Sector SPDR Fund
- XPO
- XPO Logistics, Inc.
- XLF
- Financial Select Sector SPDR Fund
- XLV
- Health Care Select Sector SPDR Fund
- XLI
- Industrial Select Sector SPDR Fund
- XLB
- Materials Select Sector SPDR Fund
- XLG
- RYDEX RUSSELL TOP 50 ETF
- XBI
- SPDR S&P BIOTECH
- XHB
- SPDR S&P HM BLDR
- XME
- SPDR S&P MTL&MNG
- XES
- SPDR S&P O&G EQU
- XOP
- SPDR S&P O&G EXP
- XPH
- SPDR S&P PHARMA
- XRT
- SPDR S&P RETAIL
- XSD
- SPDR S&P SEMICND
- XLK
- Technology Select Sector SPDR Fund
- XLU
- Utilities Select Sector SPDR Fund
- XNN
- XENONICS HLDGS INC
- XFN
- XFONE INC
- XTXI
- Crosstex Energy, Inc.
- XTEX
- Crosstex Energy, L.P.
- XRAY
- DENTSPLY International Inc.
- XIDE
- Exide Technologies
- XXIA
- Ixia
- XONE
- The ExOne Company
- XWES
- World Energy Solutions Inc (DE)
- XBKS
- Xenith Bankshares, Inc.
- XNPT
- XenoPort, Inc.
- XLNX
- Xilinx, Inc.
- XOMA
- XOMA Corporation
- XOOM
- Xoom Corporation
- XPLR
- Xplore Technologies Corp
- XRSC
- XRS Corporation
- XRTX
- Xyratex Ltd.
- XTRN
- Las Vegs Railway
- XPRT
- LECG CP
- XDSL
- Mphase Tech Inc
- XLYS
- PowerShares S&P SmallCap Consumer Discre
- XLPS
- PowerShares S&P SmallCap Consumer Staple
- XLES
- PowerShares S&P SmallCap Energy
- XLFS
- PowerShares S&P SmallCap Financials
- XLVS
- PowerShares S&P SmallCap Health Care
- XLIS
- PowerShares S&P SmallCap Industrials
- XLKS
- PowerShares S&P SmallCap Information Tec
- XLBS
- PowerShares S&P SmallCap Materials
- XLUS
- PowerShares S&P SmallCap Utilities
- Qiao Xing Uni Re
- XCASF
- X Cal Resources Ltd
- XRIT
- X-Rite Inc
- XAND
- Xanadoo Company
- XATA
- Xata Corp
- XCEL
- Xcellink Internl
- XPGH
- Xcelplus Global Holdings Inc
- XCTGF
- XCite Energy Ltd
- XCRP
- Xcorporeal Inc
- XEBEF
- Xebec Adsorption
- XDRC
- Xedar Corp
- XELR
- Xelr8 Holdings
- XEPRF
- Xemplar Energy Corp
- XCHO
- XenaCare Holdings Inc
- XNTIF
- Xentel DM Inc
- XETA
- Xeta Tech Inc
- XFMY
- Xformity Tech
- XNGSF
- Xinao Gas Holdings Ltd
- XRGYF
- Xinergy Ltd
- XNGAF
- Xing AG
- XSEL
- Xinhua Sports and Entertainment Limited
- XNYH
- Xinyinhai Technology Ltd
- XOHO
- XO HOLDINGS INC
- XODGE
- Xodtec Led Inc
- XPLT
- Xpel Technologies Corp
- XLRT
- Xplore Technolgs
- XRMGF
- XRM Global Inc
- XSRAF
- Xstrata PLC
- XSRAY
- Xstrata PLC
- XSNX
- Xsunx Inc
- XTLBY
- Xtl Biopharm Adr
- XTGR
- Xtra-Gold Resources Corp
- XSAF
- Xtrasafe Inc
- XTMCF
- Xtreme Coil Drilling Corp
- XTMM
- Xtreme Motorsports International Inc
- XLEFF
- XXL Energy Corp
- XAA
- American Municipal Income Portfolio
- XNY
- China Xiniya Fashion Limited
- XEC
- Cimarex Energy Co
- XCO
- EXCO Resources NL
- XLS
- Exelis Inc.
- XOM
- Exxon Mobil Corporation
- XFP
- Lehman ABS Corporation
- XFR
- Lehman ABS Corporation
- XKE
- Lehman ABS Corporation
- XKO
- Lehman ABS Corporation
- XVG
- Lehman ABS Corporation
- XRS
- TAL Education Group
- X
- United States Steel Corporation
- XCJ
- Xcel Energy Inc
- XEL
- Xcel Energy Inc.
- XRM
- Xerium Technologies, Inc.
- XRX
- Xerox Corporation
- XIN
- Xinyuan Real Estate Co Ltd
- XL
- XL Group plc
- XOXO
- XO Group, Inc.
- XUE
- Xueda Education Group
- XYL
- Xylem Inc.
- XRU
- CurrencyShares Russian Ruble Trust
- XJT
- EXPRESSJET HLDGS INC
- XVF
- LEHMAN ABS 8.0 CORTS 03-6 FORD
- XFB
- LEHMAN ABS 8.125 CORTS 02-9
- XFD
- LEHMAN AIG DB BK
- XKN
- LEHMAN FORD MOTR
- XKK
- LEHMAN GOODYEAR
- XFJ
- LEHMAN MOT A-1
- XFH
- LEHMAN MOTOROLA
- XFL
- LEHMAN VERIZON
- XPP
- ProShares Ultra MSCI FTSE/Xinhua China 2
- XTO
- XTO Energy Inc