SEBI has impounded ₹3.68 crore from Copthall Mauritius Investment and Mansi Share & Stock Broking for allegedly manipulating Sensex prices during the new Closing Auction Session. The Association of National Exchanges Members of India (ANMI) has backed the regulator’s strict stance, highlighting the importance of maintaining market integrity as new trading windows evolve.
The Securities and Exchange Board of India (SEBI) has taken enforcement action against two entities for alleged price manipulation. The regulator impounded ₹3.68 crore from Copthall Mauritius Investment Ltd and Mansi Share and Stock Broking Pvt Ltd. The regulator identified wrongful gains of ₹2.96 crore and ₹71.65 lakh respectively from the accused parties.
This action follows suspicious trading patterns observed during the newly introduced Closing Auction Session (CAS) on August 13, 2026. The CAS framework, which officially began on August 3, 2026, aims to improve price discovery at the end of the trading day. However, this incident demonstrates that regulators are closely monitoring these new trading windows to prevent unfair practices.
Industry Reaction and Regulatory Oversight
Kamlesh Shroff, President of the Association of National Exchanges Members of India (ANMI), publicly supported SEBI’s decision. He stated that the regulator’s move sends a clear message to market participants about the necessity of maintaining market integrity. Shroff noted that while extended trading windows, such as the 3:20 PM to 3:50 PM period, can contribute to better market depth and price discovery, they also require careful surveillance.
Shroff remarked that the regulator is observing structural changes within the market very carefully. He suggested that market participants must pay close attention to trading data, especially around major market expiries, as SEBI is using a data-driven approach to identify potential irregularities.
Expanding Market Infrastructure
Beyond enforcement, the regulator and industry bodies are pushing for new frameworks to improve market structure. This includes the Fixed Income Channel Partners (FICP) framework and the use of the ‘riskometer’ to help investors understand credit risks. These initiatives are designed to encourage more retail and smaller investors to participate in the bond market, which has traditionally been dominated by institutional players.
Technology-driven initiatives, including online bond platforms and tokenization, are also being promoted to improve liquidity. Liquidity remains a key challenge in the corporate bond market, as it directly impacts price discovery and prevents investors from facing disadvantageous trade executions.
What Investors Should Monitor
This incident highlights that even with advanced trading mechanisms, risks like price manipulation can occur. Investors should be aware that the regulator is keeping a close watch on structural changes in the market, particularly in newer sessions like the CAS.
The key monitorable moving forward will be how brokerage firms and market intermediaries strengthen their internal compliance controls. As SEBI continues to focus on risk-based oversight, the ability of intermediaries to maintain strict adherence to evolving rules will be a crucial factor in ensuring smooth market operations and protecting investor interests.