The confusion around Closing Auction Session again came into focus on September 8 with Nifty put options soaring multi-fold within minutes on F&O expiry day.
During the indicative close, Nifty even went below 23,400, thus causing a massive 400-point volatility.
On September 8, the benchmark Nifty 50's indicative close fell as much as 1.8% during the closing auction, after the index settled down 0.58% at 3:15 pm ahead of the auction.
The 50-stock index, however, pared losses and ended 0.61% lower at 23,635.1, while the BSE Sensex lost 0.73% to 75,577.58.
HDFC Bank, India's heaviest stock and top private lender, saw its indicative close fall as much as 3.91% during the auction, after ending regular trading down 0.91%. The stock ultimately closed 1.1% lower.