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An uptick is a transaction that occurs at a higher price than the previous trade for a given security. An uptick is sometimes called a plus tick. The opposite of an uptick is a downtick. A zero uptick, while not actually a downtick, is a trade that occurs at the same price as the prior transaction where that prior trade was an uptick. The zero uptick is sometimes called a zero-plus tick. The opposite of the zero downtick is the zero uptick. The uptick and zero uptick sometimes matter in the case of short sales. For instance, SEC regulations limit certain short sales to trades that are either an uptick or a zero uptick. Such a rule is called a tick test. |
