How it works
Once a stock's price reaches the upper bound of its daily price-limit range (set based on the previous day's close), no trade can execute above that price for the rest of the day. This state is called limit up.
Things to watch for
A stock with favorable news that attracts a concentration of buy orders is prone to hitting limit up, but this also reflects a strongly skewed supply-demand balance, and it has limited value as a predictor of how the price will move on subsequent days.
