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📌 At a Glance
Jane Street, the trillion-dollar American quant giant known for brainiac trading, just got slapped with a ₹4,840 crore freeze and banned from Indian markets. Why? SEBI accused them of manipulating BANKNIFTY using expiry-day pump-n-dump stunts. The desi watchdog didn’t blink. Retail traders cheered. And the rest of Dalal Street watched like it was an IPL final.
🎬 1. Introduction – Wall Street Meets Lajpat Nagar
If Warren Buffett is the wise grandpa of value investing, Jane Street is that IIT topper turned grey-hat hacker who reverse-engineered the market and said, “Ab main dikhata hoon kaun boss hai.”
But this time, the algo overlords flew a little too close to the BankNIFTY expiry candle — and got scorched.
🧠 2. WTF Does Jane Street Even Do?
Jane Street is a global proprietary trading firm. They don’t manage your money. They just:
Trade everything from options to ETFs to commodities.
Use supercomputers, code (OCaml, bro), and PhDs.
Employ “market-making” and “stat-arb” to milk inefficiencies.
In 2023 alone, they reportedly made $10.6 billion in profit. Yes, with a “B”.
In India, they entered silently, via Jane Street India Pvt Ltd and a couple of Mauritius-based arms. No press releases. No ribbon cuttings. Just keyboard clacking and some BankNIFTY jujutsu.
💰 3. The Financials – ₹4,840 Crore of Expiry-Day Magic?
Between Jan 2023 and Mar 2025, SEBI says Jane Street:
Raked in ₹43,289 crore in gross trading gains from index options.
Of this, ₹4,839.7 crore came from allegedly manipulating expiry-day price movement in BankNIFTY.
Trades were run by Jane Street India and Jane Street Mauritius together.
This wasn’t your average “buy low, sell high” gig. It was
