India's stock market adopts closing auction to set end-day prices

Effective August 3, 2026, the National Stock Exchange will replace the long-standing volume-weighted-average-price method with a Closing Auction Session for roughly 200 stocks that have futures and options contracts. Trading for these securities stops at 3:15 pm, after which all buy and sell orders are aggregated and a single price that enables the greatest volume of trades is computed and executed by 3:35 pm. The auction begins with a reference price derived from trades between 3:00 and 3:15 pm, cancels stop-loss orders, and bars iceberg orders; the next five minutes allow market and limit orders, followed by a limit-only phase that ends at a randomly chosen time between 3:28 and 3:30 pm.

Derivatives can continue trading until 3:40 pm, letting participants adjust positions after the underlying’s closing price is known. Early results showed a sharp divergence between the Nifty spot and futures, creating temporary accounting noise for arbitrage funds, but the change is expected to reduce tracking error for index funds and align India with other major exchanges that already use closing auctions.