DEFINITION of 'Zero Minus Tick'

A securities trade executed on an exchange at the same price as the preceding trade, but at a lower price than the last trade of a different price. For example, if a succession of trades occur in the following order - $10.25, $10.00, and $10.00 - the last trade would be considered a zero minus tick or zero downtick trade.

BREAKING DOWN 'Zero Minus Tick'

Until 2007, Securities And Exchange Commission (SEC) regulations prohibited against selling a stock short on a down tick or a zero minus tick. As a result potential short sales would have to pass a tick test to make sure that the stock was trading up or flat before the short sale could go through. The restriction was eliminated after the SEC concluded that U.S. markets functioned orderly enough that excessive short sales would not artificially drive down prices. The advent of decimalization also helped the rule get lifted because it reduced the average size of a tick move from fractions to pennies.

  1. Minus Tick

    Designates a trade that occurs at a lower price than the immediately ...
  2. Zero Plus Tick

    A security trade that is executed at the same price as the preceding ...
  3. Tick Index

    The number of stocks trading on an uptick minus the number of ...
  4. Tick Size

    The minimum price movement of a trading instrument. The price ...
  5. Closing Tick

    The difference between the number of stocks that closed higher ...
  6. Zero Uptick

    A transaction executed at the same price as the trade immediately ...
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