MARKET STRUCTURE DICTIONARY

jiggle  A slang term for an unexplained short lived price increase followed by an abrupt drop.  Sometimes the result of an attempt to (briefly) improve the perceived value of a large position.  For example, That was a nice little jiggle in XYZ.  I wander who got suckered.

jitters  Anxiety over market conditions, as in The market experienced early jitters this morning after the jobless numbers came out.

jobber  An abbreviation of stock jobber.  An older, less used term for market maker.  Originated in London.

jobber's turn  A London term for the portion of the bid/asked spread that a stock jobber is able to capture as profit.   

joint account  An account owned by two or more persons. 

joint adventure  An archaic term for a joint account.

Josh!  Historically, a word shouted at the New York Stock Exchange to wake a sleeping member.

jumping the gun  The illegal practice of trading based on nonpublic information that will likely affect the market price when made public.  See also FRONT RUNNING.

junior trader  A trader who trades under the loose supervision of a more senior trader.  In a team trading environment in a broker/dealer, the junior traders are often responsible for the execution of order flow, while the more senior traders focus on block trading, proprietary trading, and inventory management.  See also TRADER, ASSISTANT TRADER, SENIOR TRADER, and HEAD TRADER.

just me asking  A personal request for information.  As opposed to a customer request for information.  For example, How much XYZ do we really have for sale?  Just me asking.