BY HIMANSHU YADAV, THIRD-YEAR STUDENT AT MNLU, CS.
INTRODUCTION
India is the world’s largest derivatives market, accounting for nearly 60% of the 7.3 billion equity derivatives traded globally in April, according to the Futures Industry Association. Amid growing concerns over market integrity and transparency, the Securities Exchange Board of India (‘SEBI’) took decisive action to protect the interests of investors. On July 3, 2025, the SEBI banned Jane Street from Indian markets for manipulating indices. The US-based global proprietary trading firm, Jane Street Group, operating in 45 countries with over 2,600 employees, is banned from trading until further notice. The order marks a significant regulatory action against market manipulation. Jane Street reportedly earned ₹36,502 crore through aggressive trading strategies, facing ₹4,843 crore in impounded unlawful gains.
In April 2024, based on prima facie evidence, SEBI initiated an investigation against entities of Jane Street for alleged market abuse. The firm’s activities were found to have violated SEBI’s Prohibition of Fraudulent and Unfair Trade Practices relating to Securities Market Regulations, 2003 (‘PFUTP’). The further investigation by SEBI led to findings that on the weekly index options expiry dates, the firm was holding extremely large positions in cash equivalents in the Future and Options (‘F&O’) market. Based on prima facie evidence, the SEBI issued a caution letter to Jane Street and its related entities.
The activity of Jane Street, mostly done on expiry dates, allowed the firm to influence the settlement outcomes. On expiry day, the closing price of an index (like Nifty or Bank Nifty) determines the final settlement value of all outstanding options and futures contracts. Even a small change in the index’s closing value can lead to huge profits or losses, especially when large positions are involved. Due to the large position held by Jane Street, it allowed the firm to easily conceive the motive.
SEBI held Jane Street accountable for the two-phase strategy on January 17, 2024 intensive morning buying of Bank Nifty stocks/futures and simultaneous bearish options positioning, followed by aggressive afternoon sell-off to push the index lower at close. These trades directly influenced Bank Nifty’s settlement value, disproportionately benefiting Jane Street’s option positions at the expense of others.
HOW JANE STREET’S JANUARY 17, 2024 TRADES MANIPULATED THE BANK NIFTY INDEX ON EXPIRY DAY
The SEBI analysed the top 30 profitable trades of Jane Street, out of which 17 days were shortlisted for detailed analysis concerning derivative expiry day trades. The critical analysis of these days resulted in 15 days with the same deployed strategy for manipulation of indexes, which can also be termed as “Intraday Index Manipulation Strategy”.
The manipulation strategy was deployed in such a manner that JS Group held a large position. In Patch-I, the net purchases of JS group were INR 4,370.03 crore in cash and future markets. As the purchases in the Index stocks in the morning were executed, it raised the prices of Bank Nifty constituents and the index. The purchases were so high, it made the index move upward. Now that the index moved upward, the put option would become cheaper and the call option would become expensive. This sudden surge gives a misleading signal of bullish interest in Bank Nifty. Based on this delusion of a bullish trend, the JS group purchased the put positions at a cheaper rate quietly. In Patch-II, the JS group sells all the futures positions that were purchased in Patch-I, as the volume bought and sold was so large that it resulted in pushing the index downward. Now, the premium of put prices rises, and there is a drop in the value of call options. This sole movement by JS group entities misled the retail investors, resulting in a loss booked by the retailers, as they were the single largest net buyer across Bank Nifty during this patch. This price upward movement reflects that the Jane Street group was creating an upward pressure during Patch-I.
EXTENDED MARKING THE CLOSE STRATEGY ADOPTED BY JANE STREET
On July 10, 2024, the entity was again held liable for “Extended Marking the Close” manipulation. The tactic used under this strategy is to aggressively give a sell or purchase order in the last trading session, upon which the final closing price of a security or index is reflected. On the last day of trading (called expiry day), the final value of an index like Bank Nifty is very important because all option contracts are settled based on that final number, known as the closing price. Jane Street had placed bets that the market would fall (these are called short options positions, like buying puts or selling calls). If the market closed lower, they would make more money. So, in the last hour of trading on July 10, 2024, Jane Street sold a lot of stocks and index futures very quickly. This sudden selling pushed the Bank Nifty index down, even if only slightly. Even a small drop in the index at the end of the day can increase the value of their bets and bring in huge profits. This tactic is called “marking the close” It means influencing the final price at which the market closes to benefit your trades.
THE LEGAL PERSPECTIVE ON THE STRATEGIES ADOPTED BY JS GROUP
In trading, manipulating the market effectively creates and uses monopolistic power. Order-Based Manipulation (‘OBM’) by high-frequency traders have several negative effects, such as heightened price volatility in both frequency and size, unfair and monopolistic profit from manipulated investors’ losses and instability potential.
The JS group and its entities are allegedly held liable for the Intra-day Index Manipulation strategy and Extended Marking the Close strategy. Regulations 3 and 4 of the SEBI PFUTP Regulations, 2003, prohibit any act that manipulates the price of securities or misleads investors. The JS Group was held liable under section 12A(a), (b) and(c) of the SEBI Act, 1992; regulations 3(a), (b), (c), (d), 4(1) and 4(2)(a) and (e) of the PFUTP Regulations, 2003.
The SEBI, which acts as a market watchdog, is well within its jurisdiction to initiate criminal proceedings as well as impose penalties against entities of the JS group under Section 24 of the SEBI Act, 1992. Section 11 of the SEBI Act 1992 empowers SEBI “to protect the interests of investors in securities and to promote the development of, and to regulate, the securities market.” Section 11B – Directions by SEBI gives SEBI quasi-judicial powers to issue directions “in the interest of investors or the securities market,” even in the absence of specific wrongdoing. It allows the regulator to: Restrain trading activities, modify operational practices, and Direct intermediaries and related entities to cease and desist from certain actions.
Further, the defence of arbitrage cannot be validly exercised by Jane Street. The activity incurred by Jane Street cannot be termed as a traditional arbitrage practice, as arbitrage means taking advantage of existing price gaps naturally. Jane Street was not only finding pricing gaps and making fair profits rather Jane Street was also manipulating the pricing of some index options and futures to change the market in a way that isn’t normal arbitrage.
Jane Street artificial price moves through high-frequency, manipulative trading to mislead the market.
WAY FORWARD
The Jane Street ‘Soft Close’ Strategy and SEBI’s delayed discovery of such transactions highlight the extent to which a system can lag in evaluating manipulative actions by traders at machine speed. It was actually in 2023, the U.S. Millennium, a prominent global hedge fund, filed a lawsuit against Jane Street after poaching its employees. These employees disclosed a previously covert Indian market strategy centred around artificially influencing expiry-day closing prices to benefit Jane Street’s derivatives positions, a tactic akin to a “soft close.” Only upon the filing of such a suit, the SEBI launched a full-fledged investigation, and the regulator analyzed the 3-year expiry trades of the JS Group. The SEBI’s long-term sustained efforts over the years to safeguard the retail investors from losing their money, at this juncture, a much more advanced regulatory scrutiny is required. Jane Street, being a high-frequency trader, the tactics deployed by such an entity shock the market and have a grave impact on the retail investors. High-frequency Trading (‘HFT’), has the potential to bring the most worrisome instability to the market. The Flash Crash 2010, which was triggered by automated selling orders worsened by HFT, is one of the most severe events that disrupted market stability. Going forward, SEBI must adopt a more agile and tech-driven oversight model, capable of detecting unusual volumes, timing-based trade clusters, and order book imbalances in real time. It should also consider making a special HFT Surveillance Unit that works with AI-powered systems. This isn’t to replace human judgment, but to help with pattern recognition and rapidly identify anything that doesn’t seem right.
CONCLUSION
The regulator recently released statistics showing that the number of retail investors in the derivatives market is close to 10 million. They lost 1.05 trillion rupees ($11.6 billion, £8.6 billion) in FY25, compared to 750 billion rupees in FY24. Last year, the average loss for a retail investor was 110,069 rupees ($1,283; £958). Due to such manipulative trading activities, it is the retail derivative traders who face a tight corner situation and end up losing their money. SEBI, in its report published on July 7, 2025, highlights that 91% of retail investors lose their money in the Equity Derivative Segment (‘EDS’) The regulatory check and stricter analysis on the trading session are the need of the hour. But on the contrary, cracking down on the practice of such a global level player is what SEBI should be praised for. More dedicated and faster technology should be adopted by SEBI to carry out such an investigation in a swifter manner.
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