Definitions Starting with "X"
X-Efficiency
X-efficiency describes a company's inability to get the maximum output for its inputs due to a lack of competitive pressure. Economist Harvey Leibenstein, a Harvard professor who studied the psychological aspects of economics, first used the term. Read more
X-Mark Signature
An X-mark signature is a mark made by a person who is not able to sign his or her name. Let's say John Doe suffers a traumatic brain injury and can no longer read or write. Read more
XBRL
XBRL stands for Extensible Business Reporting Language. XBRL is a code through which companies and other entities can communicate business information. Read more
XD
XD is a symbol to indicate that a security is trading ex-dividend. The ex-dividend date is the day on which all shares bought and sold no longer come attached with the right to receive the most recently declared dividend. Read more
XDIS
XDIS is a symbol to indicate that a security is trading ex-dividend (or ex-distribution, as the abbreviation suggests). The ex-dividend date is the day on which all shares bought and sold no longer come attached with the right to receive the most recently declared dividend. Read more
Xenocurrency
Xenocurrency is a currency that trades in foreign markets. For example, Euros trade in American markets, making the Euro a xenocurrency. Read more
Xetra
Xetra is a trading system owned by the Deutsche Borse (German stock exchange). Started in 1997, about 250 participants (mostly brokerages, dealers, and market makers) in 19 countries use Xetra, which is an electronic trading system for stocks, bonds, warrants, ETFs and other securities. Read more
XPO
An XPO is a perpetual option. An option gives the holder the right, but not the obligation, to purchase (or sell) 100 units of a particular underlying security at a specified strike price on or before the option's expiration date. Read more
