Shares of BSE (Bombay Stock Exchange) took a sharp hit on June 11, plunging nearly 6% after the National Stock Exchange (NSE) placed the stock under the Additional Surveillance Measures (ASM) framework. This regulatory action, designed by SEBI to curb excessive volatility and safeguard investor interests, pushed BSE’s stock to an intra-day low of ₹2,823.10. Despite a 1.5% gain over the past five trading sessions, this sudden move has triggered concern among investors. Being listed under the long-term ASM category comes with significant trading restrictions, including prohibition of stock pledging, removal of collateral margins, and reduced collateral value, making it harder for traders to leverage positions. The ASM tag is typically applied to stocks showing abnormal price movements or volumes, hinting at speculative activity. Alongside BSE, other notable names like Data Patterns, Cochin Shipyard, Senco Gold, and Paras Defence have also been placed under ASM, signaling broader regulatory tightening. For retail and institutional investors alike, this highlights the importance of caution when navigating highly volatile counters.