NSE implements Short-Term Additional Surveillance Measure (ST-ASM) on select securities with increased margin requirements effective December 4, 2025.
Impact
High
Severity
High
Justification
High margin requirements (50% or existing margin, whichever is higher, capped at 100%) being imposed on specific securities due to surveillance concerns, significantly affecting trading in these stocks
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.