India’s financial markets have been jolted by a landmark regulatory crackdown that could redefine how foreign proprietary trading firms operate in the country. At the heart of this storm is Jane Street, a globally renowned high-frequency trading (HFT) firm based in New York, known for its sophisticated, algorithm-driven strategies. The SEBI has accused Jane Street of manipulating the Indian derivatives market, triggering a regulatory response that signals a zero-tolerance stance against market abuse, no matter how advanced or globally respected the player involved.
Jane Street was founded by a small group of traders and technologists in a tiny New York office. Today, it has more than 3000 employees across five global offices and trades a broad range of asset classes on more than 200 venues in 45 countries. By leveraging cutting-edge algorithms and ultra-fast trading infrastructure, the firm targeted India’s booming derivatives market.
Jane Street entered India in 2020 through entities like JSI Investments, JSI2 Investments, Jane Street Asia Trading, and Jane Street Singapore, partnering with Nuvama Wealth Management for its operations in the cash segment. By leveraging cutting-edge algorithms and ultra-fast trading infrastructure, the firm targeted India’s booming derivatives market, where the National Stock Exchange accounted for over 60 per cent of global equity derivatives trades.
Between January 2023 and March 2025, Jane Street reportedly earned ₹36,502 crore, including ₹735 crore in a single day—January 17, 2024. These eye-popping profits drew scrutiny. SEBI launched an investigation and uncovered a deliberate manipulation scheme designed to distort price discovery and unfairly profit from expiry-day volatility.
SEBI’s 105-page interim order, backed by over 500 pages of annexures, outlined two core strategies used by Jane Street. First was ‘Index Inflation and Dumping’: In the morning, Jane Street entities bought large quantities of Bank Nifty stocks and index futures to artificially push the index higher. Simultaneously, they took short positions in Bank Nifty options. Later in the day, they dumped the stocks, causing the index to fall, maximising profits on their options trades.
The second strategy was ‘Marking the Close’: In the final minutes of trading, Jane Street allegedly placed large buy or sell orders aimed at influencing the closing prices of the Nifty and Bank Nifty indices. These are critical benchmarks for settling derivatives, and manipulating them distorted settlement values in Jane Street’s favour. These strategies allowed Jane Street to extract significant profits with limited capital, destabilising the market and undermining fair price discovery.
SEBI’s Crackdown
Despite receiving a warning from NSE in February 2025, Jane Street resumed these tactics by May, leading SEBI to label them a “bad faith actor.”
In July 2025, SEBI took unprecedented action:
- Banned Jane Street and its affiliates from Indian markets
- Impounded ₹4,843.5 crore in alleged illicit gains
- Restricted bank operations and carry-forward exposure in derivatives
- Launched broader investigations into similar malpractices by other firms
This response sent a strong message: foreign firms, regardless of global stature, would not be allowed to compromise Indian market integrity.
Structural Flaws Exposed
Jane Street’s actions exposed critical weaknesses in India’s financial infrastructure:
- Shallow cash markets, where even modest trades can distort index values
- Lack of integrated, cross-segment surveillance
- Inadequate algorithm accountability, as firms blame automated systems
- Weak deterrents, allowing wrongdoers to pay fines and re-enter markets
The FPI Factor and Capital Flight
Jane Street allegedly repatriated over ₹32,681 crore in profits, raising concerns about capital flight and the opacity of foreign portfolio investor (FPI) structures. The case underscores the need for stricter disclosures, including ownership transparency and algorithm reporting, to prevent misuse of India’s open-door policy for foreign capital.
Lessons and Reforms
While SEBI is now investing in AI-based surveillance tools, broader regulatory reforms are necessary:
- Restrict or rework expiry-day trading norms
- Raise margins for high-risk positions
- Introduce a retail investor compensation mechanism
- Enforce equal access to trading infrastructure
- Launch system-wide probes into FPIs and institutional traders
The scandal also offers key lessons for investors:
- Avoid expiry-day speculation, often targeted by manipulative actors
- Be cautious with derivatives trading, especially options
- Don’t chase index movements blindly—they may not reflect fundamentals
- Stay informed about regulatory actions and market dynamics
A Moment of Reckoning
The Jane Street episode is a turning point. It forces regulators to evolve rapidly in a financial world dominated by speed, data, and complex strategies. While SEBI’s recent actions are commendable, they are just the beginning. The regulator must now move beyond penalties and focus on restitution and systemic reform.
India’s markets cannot be left vulnerable to algorithmic abuse. Protecting retail trust and ensuring fair play must become non-negotiable. If SEBI can seize this moment to strengthen rules, surveillance, and enforcement, it can restore credibility. But if the lessons are ignored, the damage to investor confidence could be irreversible.
