JPMorgan India options ban signals quicker regulatory action from SEBI

India’s market regulator just demonstrated what happens when you try to game a system that’s barely two weeks old. The Securities and Exchange Board of India (SEBI) issued an interim order banning Copthall Mauritius Investment Ltd., a JPMorgan Chase entity, and local brokerage Mansi Share and Stock Broking Ltd. from participating in Indian securities markets after alleged manipulative trading during the country’s newly introduced Closing Auction Session. The most striking detail isn’t the allegation itself. It’s the timeline. SEBI moved just six days after the suspected manipulation occurred on August 13, 2026, a pace that would have been virtually unrecognizable from the regulator’s historical rhythm. What happened during the closing auction The Closing Auction Session, or CAS, launched on August 3, 2026, replacing the previous volume-weighted average price method. Instead of averaging prices over a period, the CAS runs a focused 20-minute auction window designed to land on one equilibrium closing price for eligible stocks. The mechanism mirrors what major exchanges like the NYSE and LSE already use. On August 13, which happened to be the weekly expiry day for BSE Sensex derivativ...