On June 11, BSE Ltd shares fell 5% intraday to ₹2,855 after being placed under Stage 1 of the NSE's Additional Surveillance Measures (ASM) framework. The stock had surged over 130% since March, driven by BSE’s growth in the equity derivatives market and anticipation of NSE’s IPO. The ASM framework, introduced by SEBI and exchanges, aims to curb speculative trading by imposing stricter margin requirements and limiting intraday leverage. It serves as a caution for investors amid high volatility. BSE’s inclusion in ASM ended a nine-day winning streak and underscores the need for investor diligence during rapid price movements.