Summary: The Nifty 50 fell nearly 200 points on August 4 while the Sensex remained largely unchanged due to the introduction of the Closing Auction Session (CAS) for F&O stocks. The new closing price mechanism created temporary differences between NSE and BSE closing prices, leading to divergent index movements. NSE said such variations are expected … Continue reading The CAS Conundrum: Why Nifty Fell Nearly 200 Points While Sensex Stayed Flat