BSE shares slid nearly 6% after SEBI rescheduled weekly Sensex expiry to Thursday, raising fears of lower market share. Analyst Finlight Research flagged a 20-24% downside as BSE enters the ASM list. Falling option volumes and tighter liquidity from hedge fund curbs may fuel volatility. Buy-on-dip levels seen at ₹2,450- ₹2,050.