New Delhi, Sept. 3 -- The National Stock Exchange (NSE) is set to revise the rules governing its pre-open session from Monday, September 7, while keeping the overall session timings unchanged.

The key changes include splitting the order-entry period into two phases and imposing restrictions on market orders during the second phase. The revised framework is aimed at aligning the pre-open session with Sebi's introduction of the Closing Auction Session (CAS) in the equity cash market.

The changes are also intended to bring greater alignment between the cash and derivatives segments and ensure a smoother transition in market operations.

Effective September 7, the order-entry period will be divided into two phases. Phase 1 will run from 9:0...