How Jane Street’s secret billion-dollar trade unraveled

Planet Money discusses how the trading firm Jane Street made billions of dollars exploiting a loophole in the Indian options market, taking advantage of inexperienced retail investors. The story begins with a lawsuit that inadvertently revealed Jane Street's lucrative strategy. The podcast explores the perspective of an Indian day trader, Venky, who lost significant money, and examines the regulatory response from the Securities and Exchange Board of India (SEBI), which accused Jane Street of market manipulation. While Jane Street defends its actions as legitimate arbitrage, SEBI argues the firm intentionally misled traders for profit, leading to an investigation and a temporary trading ban. The episode further discusses the implications of Jane Street's actions, the regulatory challenges, and the debate over whether the firm's activities constituted arbitrage or market manipulation.