Big Change for F&O Traders

If you trade in the stock market, especially in F&O (Futures & Options), there's an important change you should know.Until now, the closing price of F&O stocks was calculated using the average price (VWAP) of trades during the last 30 minutes of trading.From now on, that will change.The stock exchange is introducing a Closing Auction Session (CAS) for F&O stocks.What is CAS?CAS stands for Closing Auction Session. It is a special 15-minute session held before the market closes to decide the final closing price of an F&O stock.Instead of taking an average price, the exchange will match buy and sell orders. The price at which the maximum orders match will become the official closing price.What will happen?

• Normal trading will continue until 3:15 PM.
• After 3:15 PM, cash market trading for F&O stocks will stop.
• Traders can place orders during the auction session.
• The exchange will display an indicative closing price.
• Finally, the price where the highest number of buy and sell orders match will become the official closing price.
• Futures trading will continue until 3:40 PM, with a 3% price movement limit during the extended session.

Why is this change important?This new system is expected to:

• Make closing prices more accurate.
• Reduce the chances of price manipulation.
• Improve fairness during market closing, especially on expiry days.

Final ThoughtsIf you trade in F&O stocks, don't leave your screen at 3:15 PM anymore. The last few minutes of the trading day will now play a much bigger role in deciding the official closing price.
Disclaimer: This article is for educational purposes only and should not be considered investment advice. Always do your own research before making any investment decisions