Tick Test
Tick test is a temporary trading restriction, either when the market is falling or when the market is rising.
When the market is falling, a short sale rule will be engaged, which allows trading only when the price of particular stock is higher than the last trade price (called uptick) or when the price of particular stock is equal to the last trading price (called zero plus tick or zero uptick).
When the market is rising, trading will be allowed only when the price of particular stock is lower than the last trading price (called downtick) or when the price is the same as the last trading price (called zero minus tick or zero downtick).
Tick test is used in order to prevent investors to dramatically destabilize the stock price.
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