Nifty jumped 200 Points After 3.15 P.M., SEBI’s New Closing Auction Rule, Know Everything Inside

Nifty jumped over 200 points after market hours as SEBI's new Closing Auction Session boosted official closing prices of heavyweight stocks. Here's why the benchmark surged despite no fresh buying.

Post Published By: Syed Ziyauddin
Updated : 3 August 2026, 7:51 PM IST
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Mumbai: Following the conclusion of the cash market's normal trading session, the Nifty shocked investors on Monday by rising more than 200 points. The fast increase was caused by SEBI's recently established Closing Auction Session (CAS) structure for F&O-eligible equities rather than by new purchasing.

The benchmark's official closing price was found at 24,774.30 through the closing auction process, but ongoing trading in the cash market ended at 3:15 pm at the 24,573 level.

Consequently, the Nifty ended the day 390.70 points, or 1.6%, higher. The Sensex finished at 78,639.03, up 544.39 points, or 0.7%. The dramatic increase following the conclusion of normal trading did not suggest an abrupt surge in purchasing activity. Rather, it represented the effects of the market regulator's new auction-based price discovery system.

Under the updated structure, exchanges hold a 20-minute Closing Auction Session after continuous trading in F&O-eligible equities stops at 3:15 pm. In order to establish a single equilibrium closing price, buy and sell orders are gathered and matched during this time. Before the official closing price is released, there are several stages in the process, including a transition period, order gathering, and final matching.

Since the Nifty is determined by the closing prices of the stocks that make up the index, the change directly affected the index. At 3:15 PM, a number of major corporations, including as ICICI Bank and Reliance Industries, reported closing prices at auction that were higher than their previous trading prices.

Since the Nifty is a free-float market capitalisation-weighted index, price movements in heavyweight stocks such as Reliance Industries, HDFC Bank, ICICI Bank, TCS, Infosys and ITC can have a substantial influence on the benchmark's final closing level.
Even modest gains in these constituents during the auction session helped lift the index sharply above its pre-auction level.
The derivatives market continued to trade until 3:40 pm under SEBI's revised framework. As the mechanism was introduced only on Monday, market makers and arbitrageurs were still adapting to the new structure, which may have temporarily widened pricing gaps between the cash market and derivatives segment.

Location :  Mumbai

Published :  3 August 2026, 7:51 PM IST

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