What is the Uptick Rule?(업틱 룰이란 무엇인가?) Posted By: Steve Burnson: : The uptick rule stops the short selling of a stock in a sharp downtrend by restricting the ability to sell when a stock is going down in price and only allowing new short selling as a stock is going up in price. To follow the rule a new short sell can only occur at a price that is higher than the last price a stock traded at. upt..