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Sensex Calm After Wild Trading Day
28 Aug
Summary
- Sensex showed stability during Friday's closing auction.
- Thursday's sharp 2,000-point plunge may have been expiry-driven.
- Regulator sees no need for changes to the new closing auction system.
The Indian stock market, represented by the Sensex, exhibited a significantly calmer closing auction on Friday, August 28, 2026. This follows a turbulent trading session on Thursday, August 27, 2026, which saw the Sensex plummet by over 2,000 points within minutes during the monthly derivatives expiry.
Market observers suggest that Thursday's extreme price swings were likely an anomaly, exacerbated by expiry-day positioning and thin liquidity within the new Closing Auction Session (CAS) framework. The earlier session, on August 13, 2026, also saw Sebi flag index spikes and allege manipulation by an entity owned by JPMorgan Chase.
Despite concerns, the Securities and Exchange Board of India (Sebi) has indicated no immediate plans to alter the CAS. Sebi Chairman Tuhin Kanta Pandey believes market participants will gain better understanding and participation in the auction over time. He emphasized that the system is new and requires adaptation.
Technical analysts point to a potential issue with thin cash market volumes on exchanges like BSE, which has a smaller cash market share compared to its derivatives market. This disparity could amplify price movements during the auction. Sebi previously flagged similar sharp spikes on August 13, 2026, during a weekly expiry, suspecting manipulation by two entities.
