India’s newly introduced Closing Auction Session is facing its first major regulatory test after the securities regulator moved against two market participants accused of using the new mechanism to influence stock prices on a derivatives expiry day. The action involving Copthall Mauritius Investment and Mansi Share and Stock Broking has raised a broader issue for India’s market architecture: whether a mechanism designed to make closing prices more transparent can itself become vulnerable to concentrated trading pressure.

The Securities and Exchange Board of India has issued an interim order restraining the two entities from accessing the securities market and ordered funds associated with the alleged activity to be impounded. The regulator estimated wrongful gains of about 29.6 million rupees for Copthall and 7.2 million rupees for Mansi. Copthall is owned by JPMorgan Chase, giving the case additional significance because it involves an international financial institution operating through an investment entity in India. The allegations remain subject to further investigation, and the regulator has not established that the two firms acted together.

The timing of the alleged activity is particularly important. The trades took place on August 13, only days after the new closing mechanism was introduced. That means the episode is not merely a conventional market manipulation case. It also provides an early indication of how sophisticated participants can attempt to exploit the characteristics of a newly designed price-setting system.

Why the Closing Auction Changed the Market

The Closing Auction Session was introduced on August 3 for stocks with derivatives contracts as part of an effort to improve the reliability of official closing prices. Under the earlier system, closing prices were calculated using trading activity during the final 30 minutes of continuous trading. The new system instead creates a separate 20-minute auction from 3:15 pm to 3:35 pm, during which orders are collected and matched to establish an equilibrium closing price.

The objective is straightforward. An auction can bring together buying and selling interest at the end of the trading day and potentially reduce the influence of isolated transactions on the final price. Similar auction mechanisms are used in major international markets because the closing price is important for index calculations, portfolio valuations, derivatives settlement and investment benchmarks.

But changing the method also changes the way traders interact with the market. A concentrated order during an auction can potentially have greater influence on the eventual equilibrium price than the same order might have had during a long period of continuous trading. That makes the behaviour of participants during the auction especially important.

The first days of the new system already produced unusual movements in India’s major stock indexes. The Nifty and Sensex showed notable divergence after the new mechanism began, prompting questions about liquidity, market structure and differences in the composition of the two benchmarks. Regulators and market participants subsequently indicated that the system itself had functioned as designed, while acknowledging the need for the market to adjust to the new process.

Expiry Day Increased the Stakes

The alleged manipulation identified by the regulator occurred on a day when weekly Sensex derivatives expired. That detail provides an important explanation for why closing prices could have had unusually high financial significance.

Derivative contracts derive their value from an underlying asset or index. When contracts approach expiry, small changes in the underlying market can affect the value of positions substantially. The closing price of constituent stocks can therefore influence the final level of an index, which in turn can affect the settlement value of related derivatives.

According to the regulator’s interim findings, Copthall placed aggressive buy orders while Mansi placed large sell orders during the closing auction involving Sensex constituent stocks. The regulator said Mansi subsequently cancelled a substantial portion of its sell-side activity. It concluded that the trading patterns distorted prices and produced gains connected with existing derivative positions.

This is why the case matters beyond the two entities involved. A closing mechanism can only work effectively if participants believe that the price emerging from the auction reflects genuine buying and selling interest. Orders that are placed primarily to influence the final price rather than to execute a genuine investment strategy can undermine that objective.

At the same time, the regulator’s interim order does not establish that every aggressive order is manipulative. Large orders can have legitimate commercial purposes, particularly for institutional investors managing substantial portfolios. The critical issue is whether the orders, cancellations, trading patterns and associated positions demonstrate an intention to create an artificial price.

The JPMorgan Connection Raises the Stakes

The involvement of a JPMorgan-owned entity gives the case a dimension beyond a domestic brokerage dispute. Copthall Mauritius Investment is part of the wider JPMorgan group, and the allegation therefore places a globally significant financial institution within an Indian regulatory proceeding.

That does not mean the allegations have been established against JPMorgan Chase itself. The regulator’s action is directed at the specific entity identified in its order, and the investigation remains interim in nature. JPMorgan has declined to comment publicly on the matter.

The significance instead lies in what the case demonstrates about India’s increasingly sophisticated financial market. International investment firms participate heavily in Indian equities and derivatives, bringing substantial capital, sophisticated trading systems and complex strategies into a market where regulatory mechanisms are evolving rapidly.

India’s regulator therefore faces the challenge of ensuring that new market structures remain robust enough to handle sophisticated participants without discouraging legitimate institutional activity.

Transparency Alone Cannot Prevent Manipulation

One of the regulator’s central observations is that the Closing Auction Session is designed to be transparent and therefore potentially makes unusual trading behaviour easier to identify. That distinction is important.

A transparent system does not necessarily prevent manipulation. It can, however, provide regulators with better information about order placement, cancellation and price formation. Surveillance systems can examine patterns across orders, trades and derivatives positions to identify behaviour that would be difficult to detect through price movements alone.

SEBI’s speed in this case is notable. The alleged activity occurred on August 13, and the interim action followed within six days. Rapid intervention can be important in market surveillance because the deterrent effect depends partly on the perception that suspicious activity will be identified quickly.

The regulator’s challenge will now be to distinguish between deliberate manipulation and legitimate trading strategies. That will require detailed examination of the firms’ orders, their timing, cancellations, derivative exposures and the relationship between those positions and movements in the underlying stocks.

The Bigger Challenge Is Market Design

The case exposes a broader problem that accompanies almost every major change in market structure. When regulators close one potential weakness, market participants may discover another.

The Closing Auction Session was introduced to improve price discovery and bring India’s market closer to international practices. Yet the early volatility and the alleged manipulation case show that implementation matters as much as design. Liquidity during the auction, the concentration of orders, the behaviour of derivative traders and the ability of surveillance systems to identify suspicious activity will all influence whether the mechanism delivers its intended benefits.

SEBI has indicated that the new system will remain in place while improvements are considered. The regulator has also been working with market participants on issues surrounding the transition into the auction and liquidity conditions.

That approach is significant because abandoning the mechanism after an early problem would risk treating implementation difficulties as evidence that the underlying concept is flawed. The more important response is to determine whether safeguards, surveillance and market participation can be improved without weakening the purpose of the auction.

The episode also illustrates why derivatives and cash markets cannot be monitored separately. A trader may have an apparently unusual position in individual stocks for reasons that become clearer only when related derivative positions are examined. Closing-price surveillance therefore needs to connect activity across markets rather than treating each transaction in isolation.

India’s new closing auction has been created to make the end of the trading day more orderly and the final price more representative. Its first serious regulatory challenge demonstrates that the effectiveness of the system will ultimately depend not simply on its rules, but on how those rules interact with sophisticated trading strategies.

The allegations against Copthall and Mansi will have to be established through the regulatory process. But regardless of the final outcome, the case has already highlighted the central test facing the new mechanism: ensuring that the price produced at the end of the trading day reflects genuine market forces rather than the financial interests of participants capable of exerting disproportionate influence over a narrow trading window.

(Adapted from MarketScreener.com)

Categories: Economy & Finance, Regulations & Legal, Strategy