Sensex Calls Surge 40-Fold in Minutes as Expiry-Day Closing Auction Triggers Wild Swing
GujaratSamachar English 1 hr ago·10 Sept 2026, 1:15 pm
On expiry day, the closing auction for the Sensex index experienced an extraordinary surge, with its value jumping nearly 40 times within minutes. This massive, sudden increase occurred because the auction mechanism allows for a wide range of prices to be matched, and a sudden influx of buy orders drove the index to a peak that was significantly higher than its previous close. The sharp move highlights the intense volatility that can occur during the final minutes of trading when market participants rush to square off their positions.
For investors, this event underscores the importance of understanding how index auctions function. It serves as a reminder that the closing price can sometimes be distorted by temporary spikes in demand, rather than reflecting the true value of the underlying market. Retail investors should focus on the long-term trend of their holdings and avoid reacting emotionally to such short-term, mechanical fluctuations in the index.
Excerpt from GujaratSamachar English
Unprecedented volatility once again gripped Dalal Street as the Securities and Exchange Board of India's newly introduced Closing Auction Session (CAS) mechanism caused wild price swings during the weekly Futures and Options (F&O) expiry. Between 3:15 PM and 3:30 PM, the benchmark BSE Sensex witnessed violent swings…Read the original at GujaratSamachar English
Key takeaways
- Category: Stocks.
- Flagged as a high-impact, market-moving story.
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