Pre opening market session helps traders to know at which price stocks are going to open. But it doesn't shows the direction of market and how it is going to trade for rest of the day. It is not an indicator. It shows sentiments and opening price of stocks and indices.
Does pre-market trading predict?
After-Hours Trading Such activity can help investors predict the open market direction. In fact, gauges such as the Nasdaq-100 Pre-Market and After-Hours Indicators are designed to track extended hours activity specifically for this purpose.