Uptick rule (short sale circuit breaker)

The US rule that restricts short selling in a stock for the rest of the day and the next day once it has fallen 10% from the previous close.

The original uptick rule, which allowed a short sale only at a price above the last different price, was removed in 2007. Its replacement, Rule 201 of Regulation SHO (2010), is a circuit breaker: once a stock falls 10% from the previous day's close, short sales are permitted only at a price above the current best bid for the remainder of that day and the following day.

It constrains how short sales are executed on volatile days; it changes nothing about the disclosure figures shown here.