An explainer of how Jane Street manipulated the Bank Nifty index
The Securities and Exchange Board of India (SEBI) has flagged global proprietary trading firm Jane Street for allegedly manipulating Indian stock markets in an “unusual” way.
This is not your typical market violation involving a single stock or a small group of traders. Instead, SEBI suspects that Jane Street used a complex strategy involving highly liquid stocks to manipulate the Bank Nifty index, raking in massive profits from options trading while misleading the broader market — including retail investors.
What is a proprietary trading firm?
A proprietary (or ‘prop’) trading firm is a company that trades financial instruments like stocks, derivatives, bonds, or currencies using its own money — not client money — to make profits. These firms take big bets in the market and are known for employing advanced trading strategies using sophisticated algorithms, high-speed trading systems, and a large workforce of financial experts.
Jane Street is one such global prop trading firm. Founded in 2000, it employs over 3,000 people across five countries and trades on more than 200 stock exchanges and platforms globally. In India, it operates through four companies — two based in Mumbai and two registered as Foreign Portfolio Investors (FPIs) in Singapore and Hong Kong.
What exactly is SEBI alleging?
SEBI’s primary allegation is that Jane Street manipulated the Bank Nifty index — an index made up of major banking stocks — on expiry days (the last trading day of options contracts). Here’s how:
