Opening price, closing price and trading sessions of stock market
Have you ever wondered why opening price of a stock is different from closing price from previous day? This is because before opening of stock market, there is a session called "pre-opening". Similarly prior to closing of trading day, there is a corresponding "pre-closing" session. Opening price and closing price are determined separately during these sessions based on share price that can result in the highest matched quantities , therefore closing price and opening price could be different.
