One hour special Pre-Open session has been introduced only for IPOs & Re-listed scrips through the call auction trading mechanism on the first day of their trading (in case of IPOs) and recommencement of trading (in case of re-listed scrip). The special pre-open session will run parallel to the existing cycle of pre-open session for SENSEX/NIFTY & BSE exclusively traded stocks followed by subsequent continuous trading session.
The equilibrium price computation will follow the same volume maximization logic based on aggregated demand & supply of orders, which is currently followed for the existing pre-open session. All orders entered in the system should match at the same price, i.e. the equilibrium price, if they qualify as match-able. Once price is discovered during special Pre-open session, the scrip will move to continuous trading session.