The Indian stock market saw a significant change in trading timings on August 3, as the National Stock Exchange (NSE) and the Bombay Stock Exchange (BSE) introduced new rules for Futures & Options (F&O) trading. Under the updated schedule, F&O trading now concludes at 3:40 PM instead of the previous 3:30 PM.
The exchanges have also launched a Closing Auction Session for stocks with F&O contracts. This new session is designed to improve price discovery by setting more accurate closing prices and giving traders additional time to manage their positions.
New Trading Schedule Breakdown
- Regular trading for F&O stocks: Ends at 3:15 PM
- Closing Auction Session: Runs from 3:15 PM to 3:35 PM
- F&O trading extension: Continues until 3:40 PM, providing traders five extra minutes after the auction ends
Zerodha CEO Nithin Kamath commented on the change via X, noting, “Things get a little more complicated from Monday, August 3.”
How the Closing Auction Session Works
The Closing Auction Session will alter how exchanges determine closing prices. During this period, the exchanges collect buy and sell orders from traders. The price at which the highest number of orders match becomes the official closing price. The process begins after regular trading ends at 3:15 PM, starting with a reference price calculation before accepting orders, followed by order matching to determine the final closing price.
What Remains Unchanged
- Stocks without F&O contracts: Continue trading until 3:30 PM
- Trade modification window: Remains open until 4:15 PM
The new timings mean different market segments will now have varying closing times. Traders must adapt to these changes when planning trades and hedging positions. The system is expected to improve price discovery near market close and reduce sudden price movements during the final trading period.
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