News › Markets · 27 Aug 2026, 5:04 PM IST · 4 days ago

Monthly Expiry shock: Did CAS fail its biggest test after Sensex loses 2,000 points in 6 minutes?

Bias: Neutral 0

In one line — The Sensex witnessed a sharp late-session swing of over 2,000 points in six minutes on Thursday, raising fresh questions about the Closing Auction Session (CAS) on its first monthly derivatives expiry. The Nifty also end

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Source: Economic Times · AI-summarised by Anadi · Updated 27 Aug 2026, 5:32 PM IST

What Happened

The Sensex witnessed a sharp late-session swing of over 2,000 points in six minutes on Thursday, raising fresh questions about the Closing Auction Session (CAS) on its first monthly derivatives expiry. The Nifty also ended lower as thin auction-window liquidity amplified volatility and drew renewed regulatory scrutiny.