Quant Trading in the Stock Market: SEBI’s Jane Street Ban and What It Means for India

July 7, 2025 by PC

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In today’s data-driven financial world, quantitative trading—or quant trading—is transforming how markets operate. Unlike traditional trading based on gut instinct or news headlines, quant trading relies on algorithms, mathematical models, and vast datasets to make fast, precise trading decisions. It’s the engine behind many hedge funds and investment strategies, quietly driving trades in milliseconds with minimal human intervention.

Quant Trading Introduction: What is Quantitative (Quant) Trading?

Imagine using math, data, and computers to decide when to buy or sell stocks — that’s quantitative trading (or quant trading). It’s like putting the brain of a data scientist inside the stock market!

Instead of gut feelings or “tips,” quant traders use algorithms — step-by-step formulas — that analyze huge amounts of data like:

Stock prices
Volume
Economic trends
Market sentiment

These algorithms can spot patterns and execute thousands of trades in seconds — way faster than any human can.

Simple Example of Quant Trading

Let’s say a quant algorithm finds that:

Whenever a stock falls by 2% at the market open but has high trading volume, it tends to bounce back by 1.5% by afternoon

The algorithm is programmed to automatically buy the stock in such a situation and sell it after it gains — all without human intervention.

This is how hedge funds and institutions like Jane Street, Renaissance Technologies, and Two Sigma trade.

Quant Trading – Who is Jane Street, and What Did SEBI Ban?

Jane Street is a global proprietary trading firm known for high-frequency and quant-based trading. It’s one of the biggest players in U.S. and global markets.

What SEBI Did:

In June 2024, SEBI (India’s stock market regulator) barred Jane Street from trading in Indian markets, citing “unfair trading practices” that allegedly led to market distortions.

This has raised questions like:

Is quant trading bad?
Are global players manipulating Indian markets?
What does this mean for retail investors?
SEBI claimed that Jane Street’s Trading bots used “latency arbitrage” exploiting micro-second delays to make profits – something Indian investors could not compete with.

How Does Quant Trading Move the Market?

When big firms use quant strategies, they can:

Trigger rapid price movements
Create sudden spikes or crashes (flash crashes)
Influence market liquidity

Example:

If an algorithm notices Nifty 50 falling with high volume, it might short-sell — betting on further fall. If many algorithms do this, the index could drop further — not because of bad news, but due to algorithms feeding off each other.

Quant Trading Boom: A Quick History

Quantitative trading has grown rapidly over the past two decades, especially in global markets. Here’s how it evolved:

In the early 2000s, high-frequency trading began gaining popularity in the U.S. as computers got faster and data became more accessible. By 2010, we witnessed the infamous “Flash Crash” where automated algos triggered a sudden market collapse — all within minutes — showing the raw power and risks of such trading systems.

From 2015 to 2023, quant hedge funds like Renaissance Technologies and Citadel consistently outperformed traditional ones, thanks to their ability to process massive data and act in milliseconds.

As the Indian stock market grew, global quant players like Jane Street began entering the space aggressively in 2023–24. India started seeing a rise in algorithmic trading volume across NSE and BSE.

Finally, in 2024, SEBI stepped in, banning Jane Street from Indian markets, citing unfair practices and potential market distortion — marking a turning point in India’s approach to regulating algorithmic and quant-based trading.

India’s stock market volumes show that nearly 30% of trades are now algorithmic, even on retail platforms.

Forecast: What’s Next for India?

With Jane Street gone, will the market become safer or slower?

Positives: More level playing field for Indian investors
Negatives: Reduced liquidity and institutional activity

But Indian firms are building their own quant desks, and local startups are entering the scene. Expect more AI-powered trading by 2026.

Tip for Retail Investors: If you are not into Quant, don’t fear! Use this time to learn, diversify, and avoid blind trades based on noise.

Learn Quant Trading in Simple Terms

You don’t need to be a math genius. Here’s how to start:

Backtesting: Use historical data to test strategies. E.g., “What if I bought TCS after every earnings dip?”
Data Sources: Use NSE, Yahoo Finance, or APIs like Alpha Vantage.
Tools: Try Python with Pandas and NumPy or platforms like QuantConnect.

Free Resources:

Final Thoughts: Should We Fear Quants?

Quant trading isn’t evil. It brings efficiency, liquidity, and lower costs. But unchecked automation can destabilize markets, especially if only a few firms dominate.

SEBI’s move signals a shift toward fairer, more transparent trading — giving Indian investors a fighting chance in a tech-driven future.

References & Sources