will introduce a pre-open trading session in index and stock futures and options from December 8, 2025, expanding the mechanism already available in the equity cash market.
The move follows directions by the (SEBI) as part of its recent series of changes in the futures and options (F&O) market. The pre-open session is aimed at helping absorb price-sensitive information and managing volatility before the start of regular trading hours.
“There shall be no new changes in the ETI API or market data broadcast streams to facilitate the roll-out of the said functionality,” BSE said in a circular on Thursday. The same message structures and field definitions currently used for equity pre-open sessions will apply to the derivatives segment.
Testing for the new facility will be available from October 6, 2025, in the simulation environment, the exchange said. Further details on operational aspects will be communicated through a separate circular.
At present, both BSE and the National Stock Exchange (NSE) conduct a pre-open session for equities between 9:00 AM and 9:15 AM. This mechanism is designed to reduce abnormal price fluctuations that could arise from overnight news or corporate announcements before the regular market opens.
By extending the system to equity derivatives, BSE aims to bring similar price-discovery benefits to futures and options trading.