NSE overhauls closing price discovery, changes F&O expiry settlement rules from December 7
Economic Times 55 min ago·7 Nov 2026, 8:31 am
The National Stock Exchange (NSE) has announced significant changes to its trading rules, set to take effect from December 7, 2026. The exchange will overhaul the Closing Auction Session (CAS) in the equity cash segment, which is used to determine the official closing price for stocks. Additionally, the settlement cycle for equity derivatives will be shortened from the current T+1 to a T+0 settlement cycle. These updates are detailed in two circulars released on November 6.
This shift is a major structural change for the market. The new CAS rules aim to improve price discovery by reducing volatility in the final minutes of trading. Meanwhile, the move to T+0 settlement for derivatives aligns India with global best practices, allowing for faster trade settlement and potentially greater liquidity in the segment.
Investors should prepare for a more dynamic trading environment. The new rules may lead to different price movements during the closing auction. While the changes are primarily for the derivatives market, they could indirectly impact cash market liquidity. Market participants are advised to review their trading strategies to adapt to these new timelines and mechanisms.
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