SEBI Says Jane Street Investigation Is Still Ongoing as Firm Challenges ₹4,843-Crore Order

Key takeaways

• SEBI’s investigation into Jane Street has not yet reached a final conclusion.
• Jane Street is challenging the regulator’s actions before the Securities Appellate Tribunal.
• The firm wants access to additional trade records, counterparty information and communications between SEBI and the National Stock Exchange.
• Jane Street argues that earlier NSE and SEBI surveillance reviews did not establish market manipulation.
• SEBI has argued that its later, more detailed examination identified a different trading pattern and that the investigation could extend beyond the July 2025 order.
• The case could have wider implications for algorithmic trading, market-making and regulatory surveillance in India’s derivatives market.

What is happening in the Jane Street-SEBI case?

SEBI’s investigation into Jane Street remains a live regulatory matter more than a year after the regulator issued its interim order against the trading firm.

The case began with allegations that Jane Street and related entities used coordinated trading across Bank Nifty constituent stocks, futures and options to influence the index and benefit from large derivatives positions. SEBI’s July 3, 2025 interim order alleged unlawful gains of approximately ₹4,843.57 crore.

The regulator initially imposed restrictions on Jane Street’s participation in India’s securities market. After the firm deposited the disputed amount into an escrow account, SEBI lifted the trading restrictions but directed exchanges to closely monitor the firm’s future activity.

Importantly, the lifting of the restrictions did not mean that SEBI had concluded its investigation. The regulator’s order explicitly stated that monitoring would continue until completion of the investigation and any consequential proceedings.

Why is the investigation still continuing?

The dispute has moved into a complicated procedural phase.

Jane Street is challenging aspects of SEBI’s action before SAT and is seeking access to additional information that it says is necessary to defend itself against the allegations.

During recent hearings, the firm’s lawyers have asked for additional trading records, counterparty information and communications involving SEBI and the NSE. Jane Street argues that it cannot properly test SEBI’s allegations without seeing the underlying information used to construct the regulator’s case.

The firm has also questioned why SEBI reopened the matter after earlier surveillance exercises conducted by the NSE and SEBI’s own Integrated Surveillance Department.

Moneycontrol reported that Jane Street told SAT that earlier reviews did not establish a link between its equity-market activity and movements in Bank Nifty that benefited its derivatives positions.

According to the firm’s submissions, 48 of 53 trading patches examined in those earlier reviews did not establish the alleged relationship. Jane Street therefore wants to understand what changed between those reviews and SEBI’s later enforcement action.

Jane Street says earlier reviews did not establish manipulation

A major part of Jane Street’s defence is based on earlier surveillance work.

According to submissions reported by Moneycontrol and Mint, the NSE conducted a review in 2024, while SEBI’s Integrated Surveillance Department subsequently examined Jane Street’s activity.

Jane Street says these reviews covered a substantial amount of the trading activity that later became part of SEBI’s July 2025 case.

The firm argues that the earlier analysis did not establish that its trading had influenced Bank Nifty prices in a manner that benefited its options positions.

At the October 5 SAT hearing, Jane Street’s senior counsel Darius Khambata reportedly argued that the regulator should disclose the material that led it to establish a new inter-departmental investigation after the earlier surveillance exercises.

The firm has specifically sought information relating to communications between SEBI and the NSE, data exchanged between the institutions and a complaint that was referenced when the new investigation team was constituted.

SEBI, however, has not accepted Jane Street’s characterization of the earlier reviews as a complete clearance.

SEBI says the later analysis was different

The regulator’s position is that the subsequent investigation examined the trading activity in greater detail and over a broader period.

SEBI has argued that the earlier surveillance exercises should not automatically be treated as a final finding that Jane Street had done nothing wrong.

In previous proceedings, SEBI’s counsel said the regulator’s later analysis involved more granular examination of Jane Street’s order flow and trading behaviour.

The distinction matters because the regulator’s allegation is not simply that Jane Street traded heavily.

Large proprietary trading firms routinely buy and sell stocks, futures and options. The regulatory question is whether a trading strategy was designed or executed in a way that artificially influenced prices or otherwise violated securities-market rules.

SEBI’s July 2025 order alleged that Jane Street’s activity involved coordinated positions in underlying securities and derivatives around Bank Nifty expiry sessions.

The regulator’s theory was that large positions in underlying stocks could influence the index while the firm maintained much larger derivatives exposure that could benefit from the resulting movement.

Jane Street disputes that interpretation.

The ₹4,843-crore figure

The financial figure at the centre of the dispute is approximately ₹4,843.57 crore.

SEBI calculated this amount as alleged unlawful gains in its July 2025 interim order and directed the relevant Jane Street entities to deposit the money in an escrow account.

Jane Street complied with the deposit requirement while maintaining that it had not manipulated the market.

That distinction is important. The deposit does not by itself represent an admission of wrongdoing by Jane Street.

The regulator’s July order was an interim order, meaning the proceedings were not necessarily the final determination of every issue.

SEBI’s own order stated that its observations were prima facie findings based on the material available at that stage and that further investigation and proceedings could follow.

The regulator also instructed stock exchanges to monitor Jane Street’s future dealings until completion of its investigation and any consequential proceedings.

Why Jane Street wants the trading data

For a quantitative trading firm, the underlying transaction data can be critical to explaining how its strategies affected the market.

Jane Street has argued that the information supplied to it does not contain all the details it needs to test SEBI’s conclusions.

Among the information sought are counterparty details, order prices, quantities, order types and other trading information.

The firm’s argument is straightforward: if SEBI says Jane Street’s trades moved the market, Jane Street wants to examine what other market participants were doing at the same time.

For example, a large purchase by Jane Street does not necessarily prove that the firm caused a price increase. Other investors may have been buying simultaneously, or Jane Street may have been responding to existing market demand.

This is why counterparty and order-level data can become important in a market-manipulation case.

SEBI’s concern over disclosure

SEBI has resisted some of Jane Street’s broader document requests.

In earlier proceedings, the regulator argued that it had already provided the material on which the July 2025 order was based and that it was not required to disclose every internal document, communication or investigative material that had not been relied upon.

The issue has created a procedural dispute separate from the ultimate question of whether Jane Street actually manipulated the market.

That distinction explains why the case has continued for so long without a final determination on the substantive allegations.

Moneycontrol reported that the confirmatory order following SEBI’s interim order has also been delayed amid the dispute over inspection of documents.

In other words, the document-access fight is affecting the broader regulatory process.

Why the case matters for India’s derivatives market

The Jane Street dispute goes well beyond one trading firm.

India has developed one of the world’s largest derivatives markets, with algorithmic and institutional traders playing a major role in providing liquidity.

Market makers and proprietary trading firms frequently execute large volumes of transactions across cash equities, futures and options.

The regulatory challenge is therefore to distinguish legitimate market-making, hedging and arbitrage from activity that crosses the line into manipulation.

That distinction is particularly important in index derivatives.

An index such as Bank Nifty is calculated from a basket of banking stocks. A trader with a large derivatives position may therefore have an economic incentive to influence the prices of the underlying stocks.

But proving that a particular trader actually intended to manipulate an index, rather than simply responding to market conditions or conducting legitimate arbitrage, requires detailed evidence.

That is one reason the Jane Street case is being watched closely by other global quantitative trading firms.

What happens next?

The immediate dispute before SAT concerns Jane Street’s requests for additional information and SEBI’s decision not to provide some of the material sought by the firm.

Recent hearings have focused heavily on whether Jane Street should receive more information relating to the regulator’s earlier surveillance exercises and the subsequent decision to reopen the matter.

The substantive market-manipulation allegations remain contested.

Jane Street says its trading did not manipulate Bank Nifty and has challenged the regulator’s interpretation of its activity.

SEBI maintains that its investigation identified conduct that warranted regulatory action and that the investigation remains ongoing.

The next stage will therefore be important for both sides. A ruling requiring SEBI to provide more documents could give Jane Street additional material for its defence, while a decision limiting disclosure could leave the firm’s challenge more dependent on the evidence already included in SEBI’s order.

The bigger picture

The Jane Street case is becoming an important test of how India’s market regulator handles sophisticated algorithmic trading strategies.

For regulators, the case highlights the difficulty of monitoring firms whose trading decisions can involve thousands of orders, multiple instruments and extremely short time intervals. Traditional surveillance methods may not always be sufficient to understand the interaction between cash-market trades and derivatives positions.

For trading firms, the dispute raises a different question: how much information should a regulator be required to disclose when imposing a major interim enforcement action, particularly when earlier surveillance work appears to have produced different conclusions?

The answer could influence how global proprietary trading firms assess regulatory and operational risks in India.

What did SEBI actually decide in July 2025?

SEBI’s July 2025 action was an interim order, not the final end of the regulatory process. The order alleged that Jane Street and related entities had engaged in manipulative activity involving Bank Nifty and other index-related trading and directed the firm to deposit approximately ₹4,843.57 crore in alleged unlawful gains.

The order also made clear that the investigation and any consequential proceedings would continue.

Is Jane Street admitting that it manipulated the market?

No.

Jane Street has consistently disputed the market-manipulation allegations. The firm’s deposit of the amount required under SEBI’s interim order was made while it challenged the regulator’s findings.

The current SAT proceedings include Jane Street’s effort to obtain additional information that it says is necessary to challenge SEBI’s conclusions.

Why are earlier SEBI and NSE reports important?

They are important because Jane Street says earlier surveillance exercises did not establish that its trades influenced Bank Nifty prices in a way that benefited its derivatives positions.

Jane Street is therefore questioning what additional information caused SEBI to reopen the matter and subsequently issue its July 2025 interim order.

SEBI’s position is that its later examination was broader and more detailed and that the earlier reviews should not be treated as a final exoneration.

What is the central issue now?

The central procedural issue is access to information, while the larger substantive issue remains whether Jane Street’s trading strategy crossed the line from legitimate trading into market manipulation.

SEBI’s investigation is still ongoing, meaning the regulatory process has not yet reached its final conclusion.

For investors and market participants, the eventual outcome could provide an important precedent for how India’s securities regulator evaluates algorithmic strategies involving large cash-market and derivatives positions.