Explainer: What Are SEBI’s Findings on Jane Street Group’s Market Manipulation

Moneylife Digital Team 04 July 2025

Investor Interest

1. What did SEBI accuse Jane Street of doing?

SEBI found that Jane Street entities engaged in manipulating the market indices, mainly Bank Nifty index. They placed large, aggressive trades in cash and futures segments to artificially push index prices up or down, enabling them to profit from massive positions in index options built on that false movement.

2. How exactly did Jane Street profit from this alleged manipulation?

In one strategy, they created a temporary rally in the index, making put options cheaper and call options more expensive. They then built large bearish options positions (buying puts and selling calls). After that, they reversed their buying, sold aggressively to push the index back down, causing puts to surge in value and calls to fall, locking in large profits.

3. How big were their trades compared to the rest of the market?

On expiry days, Jane Street’s index options volumes were 353 times larger than the cash market turnover in Bank Nifyy constituent stocks. In individual stocks, their trades accounted for 15%–25% of total market volume during critical time windows.

4. Was this an isolated incident or a repeated strategy?

This was a repeated strategy. SEBI’s investigation covered 18 expiry days between January 2023 and March 2025 and found similar trading patterns used systematically.

5. Why does SEBI consider this manipulation under Indian law?

Under SEBI’s Prohibition of Fraudulent and Unfair Trade Practices Regulations, creating artificial price movements that mislead other market participants constitutes market manipulation and fraud.

6. Did SEBI warn Jane Street before taking this action?

Yes. In February 2025, the National Stock Exchange (NSE), on SEBI’s instructions, issued a caution letter advising Jane Street to stop such trading behaviour. Despite acknowledging the warning, Jane Street continued the same patterns.

7. What was the scale of their profits and losses?

During the review period, Jane Street earned Rs43,289 crore in profits from index options, while incurring Rs7,687 crore in losses from stock futures, index futures and cash trades. This imbalance shows that profits primarily came from options positions established through the alleged manipulation.

8. What actions has SEBI taken so far?

SEBI has issued an interim order barring Jane Street entities from continuing these trading strategies. Further penalties, recovery of unlawful gains and potential bans from Indian markets may follow after a final hearing.

9. How were retail traders impacted?

Retail traders often rely on index levels when deciding on options trades. Jane Street’s conduct distorted prices, misleading thousands of small investors and causing unfair losses or missed opportunities.

10. Will this episode lead to broader reforms in India’s derivatives markets?

Not sure. SEBI has already issued new circulars to curb excessive expiry-day speculation and may introduce further measures to improve market integrity, such as tighter position limits and enhanced surveillance. Besides, SEBI’s order will be contested in the securities appellate tribunal (SAT) which has, often, overturned SEBI’s orders.

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