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An illegal practice in which two or more market makers collude in order to artificially inflate or deflate the price of a stock, hoping to profit on the uptick or downturn. One firm will buy or sell large amounts of a certain stock and the second firm does the same, causing a buy or sell frenzy. The supposed competitors then have the opportunity to profit as the market is unaware of their collusion. See also: Insider trading, antitrust.
Illegal collusion among market makers to manipulate the market price of a stock.