The introduction of SEBI’s new Closing Auction Session system is steadily reducing the disparity between Nifty’s regular close and its post-auction settlement, signalling a shift towards more transparent and reliable price discovery methods in India’s equities market.
The gap between Nifty’s regular close and its post-auction settlement is narrowing as Indian markets settle into the new Closing Auction Session system, according to The Hindu BusinessLine. On Thursday, the benchmark ended at 24,628 at 3.15 pm and 24,636 after the auction, an 8-point difference. That was down sharply from Wednesday’s 55-point gap and the much wider moves seen on August 4 and August 3, when the difference was 155 points and 184 points respectively.
The auction mechanism, introduced by exchanges on Monday and rolled out from August 3, gathers buy and sell orders into a single pool at the end of the day and matches them at one clearing price. SEBI’s move was designed to make closing prices more reliable and harder to influence through late-session trading, replacing the earlier practice that relied on activity in the final 30 minutes. Market explainers from LiveMint, Moneycontrol and Samco say the system is intended to improve price discovery and align Indian practice more closely with major global exchanges that already use closing auctions.
Market participants say the shift should ultimately help large investors and index-linked products, even if it reduces some of the trading opportunities that existed under the old method. Shweta Rajani of Anand Rathi Wealth told The Hindu BusinessLine that the new framework should make end-of-day pricing more transparent and curb sharp swings near the close, especially on expiry and rebalancing days. Gibin John of Geojit Investments said the early index gains were being driven by wider cash-futures spreads and higher volatility, but added that the auction system should improve price discovery and may slightly compress arbitrage opportunities over time.
For index funds and exchange-traded funds, the change is also expected to reduce tracking error by giving large orders a more efficient route to execution at the close. SEBI’s phased introduction of CAS marks one of the most significant changes to India’s cash market closing process in years, and while the first few sessions triggered concern over price gaps, the latest numbers suggest traders are already adjusting.
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