What is Jane Street? Why Has SEBI Banned This Global Trading Giant?

In a significant regulatory move, the Securities and Exchange Board of India (SEBI) has barred Jane Street, one of the world’s largest quantitative trading firms, from participating in the Indian securities market. SEBI has also impounded ₹4,841 crore from the US-based firm after an investigation revealed that Jane Street made unlawful gains through alleged market manipulation. This is one of the strongest actions ever taken by SEBI against a foreign firm.

Who is Jane Street?

Jane Street is a well-known name in the global financial ecosystem, especially in the world of quantitative and algorithmic trading. The firm:

• Was founded in 2000

• Has over 3,000 employees

• Operates from five global offices across the United States, Europe, and Asia

• Earned $20.5 billion in revenue last year

• Trades securities in 45 countries

Jane Street describes itself as a firm that leverages sophisticated quantitative analysis and a deep understanding of market dynamics to maintain pricing efficiency. Their strategies are known to be highly data-driven and fast-paced.

Jane Street’s India Presence

How does Jane Street operate in India?

Jane Street has established its India presence through four group entities, with:

• Two entities based in India

• Two others based in Hong Kong and Singapore, operating as foreign portfolio investors (FPIs)

The firm started its first Indian entity in December 2020, and its activities since then have expanded significantly.

Scale of operations in India

According to SEBI, between January 2023 and March 2025, these four entities generated over $5 billion in profit by trading equity options on Indian stock exchanges. Jane Street’s India-related activities came under the spotlight last year when the firm filed a lawsuit against Millennium Management, accusing it of stealing a proprietary trading strategy.

That lawsuit revealed that the strategy—focused on Indian options trading—had made $1 billion in profits in 2023 alone. The dispute was eventually settled in December.

What are the allegations?

SEBI’s investigation revealed a two-phase market manipulation strategy:

1. Phase 1: Artificial Price Rise
   Jane Street aggressively bought banking stocks and futures, temporarily pushing up prices on the Bank Nifty index.

2. Phase 2: Profit from Fall
   Simultaneously, the firm had built large short positions in Bank Nifty options, which would profit from a price fall. After raising the prices, they aggressively sold off their holdings, triggering a market decline, from which they profited.

Circumventing regulations

SEBI also stated that Jane Street created Indian-based entities to bypass restrictions on foreign portfolio investors, who are not allowed to engage in intraday trades in the cash segment. By setting up domestic companies, they were allegedly able to engage in practices not allowed under FPI guidelines.

What is the market impact?

While the broader equity markets remained relatively stable, the news had an immediate effect on:

• Stockbroking firms: Several stocks of intermediaries fell sharply due to concerns over tighter surveillance on derivatives trading volumes

• Market sentiment: Traders expressed concerns over possible increased scrutiny from SEBI on algorithmic and high-frequency trading

Jane Street’s Response

Jane Street has disputed SEBI’s findings, stating that the firm complies with applicable regulations in every market it operates in. The firm is likely to challenge the order and may pursue legal options to contest the ban and the funds impounded.