New Delhi, July 28 -- India's stock market is set for a significant operational change from August 3, 2026, as the Securities and Exchange Board of India (SEBI) rolls out the Closing Auction Session (CAS) for eligible Futures & Options (F&O) stocks. The move changes how the closing price is determined for these stocks, extends trading in equity derivatives by 10 minutes and introduces a structured auction mechanism aimed at making end-of-day prices more transparent and representative of actual market demand and supply.

While regular cash market trading hours remain unchanged for most stocks, investors trading F&O-enabled shares will have to adapt to a new closing process that replaces the existing Volume Weighted Average Price (VWAP)-bas...