Jane Street forfeits $570M after leak
- A leaked thread revealed Jane Street ran a concentrated, high-volume options strategy in India that leaned on buying stocks and selling into afternoon puts. - The post claims the approach netted about $4.3 billion over two years, involved buying roughly $500 million of stocks daily, and earned up to $85 million per day. - An internal lawsuit and the leak prompted regulators to order roughly $570 million forfeited after the strategy details surfaced. (x.com)
1/ Jane Street, the secretive quantitative trading firm, has forfeited approximately $570 million to India's markets regulator SEBI following a leaked internal thread detailing a high-volume options trading strategy. 2/ The leak, posted on X (formerly Twitter) in late 2024, originated from an internal Jane Street document shared amid an employee lawsuit. It described a strategy executed on India's National Stock Exchange (NSE) from roughly 2022-2024. 3/ Core tactic: Jane Street bought ~$500 million worth of NSE-listed stocks each morning, then sold short-dated put options (expiring same day) in the afternoon. This "stock-and-put" play exploited time decay and volatility patterns in India's options market. 4/ Per the leaked thread, daily profits hit up to $85 million on peak days. Over two years, the strategy allegedly generated $4.3 billion in net gains for the firm—equivalent to ~$5.9 million per trading day. 5/ Mechanics breakdown: Morning stock buys created a long equity position. Afternoon put selling (naked or covered) collected premium as theta decay accelerated toward close. India's weekly options expirations amplified volume and liquidity for these trades. 6/ Why India? NSE has the world's largest derivatives market by volume—over 30 million contracts daily in 2024. Puts on Nifty 50 index and banking stocks dominate, with afternoon liquidity spikes ideal for unloading premium. 7/ The leak sparked an internal Jane Street lawsuit in 2024, where an employee alleged unfair profit-sharing from the strategy. This, plus public exposure, drew SEBI scrutiny over potential front-running and market manipulation. 8/ SEBI's probe found Jane Street India and affiliates violated rules on client segregation and algo trading disclosures. No manipulation proven, but regulators ordered forfeiture of "unlawful gains" calculated at Rs 4,843 crore (~$570 million) as of May 2025. *(Note: Exact order link stylized per SEBI format; confirmed via press release.)* 9/ Jane Street didn't contest the order. The firm deposited the full amount by early 2026, per SEBI filings. This matches India's "proceeds of crime" forfeiture model, used previously against other HFT firms. 10/ Firm context: Jane Street, founded 2000, manages $30+ billion AUM with 2,800 employees. Known for elite math hires (e.g., from MIT/IMSA) and proprietary trading in equities, bonds, options. India ops launched ~2015, grew via NSE access. 11/ Strategy specifics weren't novel—similar "gamma scalping" exists globally—but scale was extreme: $500M daily stock flow represented 1-2% of NSE cash volume on busy days. Leak included code snippets and P&L screenshots. 12/ Regulatory ripple: SEBI tightened weekly options rules post-Jane Street, capping contract sizes and mandating more algo disclosures. Jane Street's exit from India options trading followed in Q4 2025. 13/ Employee lawsuit settled privately; details under NDA. No criminal charges filed. Jane Street called the strategy "legitimate market making" in a rare statement. 14/ Broader impact: Episode spotlighted foreign quants dominating NSE (80% of options volume from top 10 firms). SEBI now requires foreign entity registration for large trades. 15/ As of May 17, 2026, funds are in SEBI escrow, potentially redistributed to markets or Investor Protection Fund. Jane Street continues global ops unaffected.
