Zero Plus Tick Law and Legal Definition
Zero Plus Tick refers to a securities transaction made at the same price as a preceding trade, but at a price higher than two transactions previous. It is also know as zero up tick. Since many years there was an "uptick rule" as established by the U.S. Securities and Exchange Commission (SEC); the rule stated that stocks could be shorted only on an uptick or a zero plus tick, not on a downtick. This rule was lifted in 2007.