NSE implements Short-Term Additional Surveillance Measure (ST-ASM) Stage I on 5 securities with 50% margin requirement effective February 2, 2026.
Impact
High
Severity
High
Justification
High margin requirement of 50% imposed on shortlisted securities affects trading positions and costs for market participants. Immediate compliance required for all open and new positions.
NSE announces list of 323 securities subject to Reversal Trade Mechanism (RTCM) effective February 2026.
Impact
Medium
Severity
Medium
Justification
RTCM is a surveillance measure affecting 323 securities with enhanced monitoring and potential trading reversals to manage market risk and protect investors from abnormal price movements.
BSE announces changes to Enhanced Surveillance Measure framework with 1 new security added, 5 securities moved to higher stage, 15 moved to lower stage, and 26 securities exiting ESM.
Impact
Medium
Severity
Medium
Justification
Affects 47 securities with varying surveillance measures; impacts trading parameters and investor awareness but represents routine surveillance framework adjustments
BSE announces revised price bands for 38 securities across equity segment, with changes ranging from 2% to 20% bands, effective from January 27, 2026.
Impact
Medium
Severity
Medium
Justification
Affects trading volatility limits for 38 securities; impacts traders and market participants dealing with these specific scrips but represents routine surveillance action rather than systemic market change
NSE circular listing 324 securities subject to Reversal Trade Cancellation Mechanism (RTCM) for November 2025, a surveillance measure to prevent price manipulation.
Impact
High
Severity
Medium
Justification
RTCM is a critical surveillance mechanism affecting 324 securities, enabling NSE to cancel erroneous or manipulative trades. High impact on trading operations and investor protection, though routine monthly update.
BSE announces demat auction for settlement number 740 covering 90 scrips with quantities ranging from 1 to 10,000 shares for delivery settlement.
Impact
Medium
Severity
Medium
Justification
Routine demat auction for delivery settlement affecting 90 scrips. While operationally important for settlement integrity, it represents standard market infrastructure process with limited broader market impact.
Four securities added to ESM Stage-I effective October 23, 2025, with 100% margin requirement and shift to Trade-for-Trade segment.
Impact
High
Severity
High
Justification
High impact due to immediate 100% margin requirement on open positions and shift to Trade-for-Trade segment, significantly affecting liquidity and trading for four securities.
BSE circular detailing securities moving in and out of the Short Term Additional Surveillance Measure (ST-ASM) framework effective October 21, 2025.
Impact
Medium
Severity
Medium
Justification
Affects trading conditions for multiple securities through surveillance framework changes. No new securities added to ST-ASM, but 9 securities removed and moved to other frameworks.
BSE circular on securities being added to, moved within, or removed from the Short Term Additional Surveillance Measure (ST-ASM) framework effective October 13, 2025.
Impact
Medium
Severity
Medium
Justification
Affects trading surveillance measures for 21 securities across multiple sectors. While not market-wide, ST-ASM application impacts liquidity and trading mechanisms for affected stocks.