Zero Minus Tick

A zero minus tick transaction occurs when a listed stock trades at the exact same price as the previous price, but at a lower price than the last different price. A zero minus tick is also referred to as a zero downtick. For example, a zero minus tick occurs if a stock trades at $9.05, $9.00 and $9.00. The first $9.00 transaction is a minus tick, however, the last $9.00 transaction is a zero minus tick since it was executed at the same price as the previous trade, but at a lower price than the last different price. Short selling is not permitted on a zero minus tick. A zero minus tick is the opposite of a zero plus tick.