Pre-open Session . How is the equilibrium price determined ?

Pre-open Session . How is the equilibrium price determined ?

If you are a trader you must have seen that there is a pre-open session from 9 am to 9:15 am for both the National Stock Exchange (NSE) and Bombay Stock Exchange (BSE). It is basically the period of trading activity that takes place just before the regular stock market session. Traders keep a close eye on this Pre-market session to guess the strength and mood of the market while looking forward to market opening. Let us try to understand how things work during these 15 minutes. At the outset let me tell you that you can place two types of orders in the stock market – market order and limit order (refer to the following graph). The 15 minutes of pre-open session consists of 3 time slots Now that we know the activities carried during these 3 time slots belonging to the pre-market session, let us take a look at how the equilibrium price determination or the call-auction session functions. Case I Say for example, previous day closing price of Stock A is Rs. 200. The following table gives the price and quantity figures during the pre-open session Share Price Order Book Demand & Supply Quantity Maximum Tradable Quantity Unmatched Orders BUY SELL Demand Supply 202 1000 985 3400 985 985 2415 204 1275 1161 13600 22000 22000 -8400 205 5000 4300 10000 10500 1000 -500 207 4000 7500 4000 6250 4000 -2250 199 2000 10000 27000 37000 27000 -10000 Share price Rs.199 corresponds to the highest tradable quantity of 27000 and hence will be considered as the equilibrium or call auction price. Case II Let’s have a look at another possible...