NSE circular announcing securities added to, moved within, and excluded from the Short-Term Additional Surveillance Measure (ST-ASM) framework effective May 20, 2026.
Impact
High
Severity
High
Justification
Directly affects trading conditions for a large number of securities. ST-ASM inclusion imposes enhanced margin and price band restrictions, materially impacting traders and investors in the listed stocks.
NSE places 51 securities under Short-Term ASM Framework Stage-I effective April 27, 2026, with no securities added to Stage-II and no movement between stages.
Impact
High
Severity
Medium
Justification
51 securities placed under Short-Term ASM Stage-I affecting a broad set of listed companies with enhanced surveillance and potential trading restrictions from April 27, 2026.
NSE places multiple securities under ST-ASM Stage I (50% margin) and Stage II (100% margin) effective April 10, 2026, covering open positions as on April 09, 2026 and new positions thereafter.
Impact
High
Severity
High
Justification
This circular imposes significantly elevated margin requirements (50%-100%) on multiple securities under the ST-ASM framework, directly restricting trading activity and increasing cost of holding positions effective April 10, 2026. Affects a large number of securities across segments.
List of securities subject to Reversal Trade Cancellation Mechanism (RTCM) for December 2025, covering over 300 stocks where specific trade cancellation procedures will apply.
Impact
Medium
Severity
Medium
Justification
Affects trading operations for over 300 securities with specific trade cancellation procedures. Important for traders and market participants dealing with these stocks to understand RTCM applicability.