Stock market timings change from Monday, August 3: Everything investors and traders need to know | Stock Market News
India's equity markets are set for one of their biggest operational changes in recent years. From August 3, 2026, the Securities and Exchange Board of India (SEBI) and the National Stock Exchange (NSE) will introduce the Closing Auction Session (CAS) for eligible Futures & Options (F&O) stocks, fundamentally changing how closing prices are determined.
The introduction of the Closing Auction Session marks a significant structural change in India's equity markets. While long-term investors may notice little difference in day-to-day investing, the new framework is expected to have a much bigger impact on F&O traders, brokers, institutional investors and passive funds,
The new framework not only replaces the existing Volume Weighted Average Price (VWAP)-based closing mechanism for F&O stocks with an auction-based system but also extends equity derivatives trading by 10 minutes, creating different closing times for different segments of the market.
The biggest change is that the market will no longer have a single closing time.
Non-F&O stocks Normal trading till 3:30 PM (No change)
F&O stocks (cash market) Continuous trading till 3:15 PM, followed by CAS till 3:35 PM
This means investors trading different market segments will need to follow different closing schedules.
The NSE has extended trading hours for equity derivatives from 3:30 PM to 3:40 PM.
The additional 10 minutes are intended to align derivatives trading with the new auction-based closing process in the cash market.
3. F&O stocks will no longer close like other shares
For stocks that are part of the F&O segment, normal trading will end at 3:15 PM.
Instead of trading continuously until 3:30 PM, these stocks will move into the Closing Auction Session, where orders are collected and matched to determine a single closing price.
Regular cash market trading remains unchanged for stocks that are not part of the F&O segment.
The new auction process will follow a structured timeline:
3:15 PM – 3:20 PM Transition from Continuous Trading Session (CTS) to CAS and reference price calculation
3:20 PM – 3:25 PM Market and limit orders can be placed
3:25 PM – 3:30 PM Only limit orders allowed; market orders cannot be modified or cancelled
3:28 PM – 3:30 PM Random order-entry closure
3:30 PM – 3:35 PM Order matching and closing price discovery
Currently, the closing price is determined using the Volume Weighted Average Price (VWAP) of trades executed during the final part of the trading session.
With the rollout of CAS, all buy and sell orders will instead be pooled together and matched at a single equilibrium price, which will become the official closing price for eligible F&O stocks.
According to SEBI, this approach is expected to improve price discovery by reflecting the combined demand and supply from all market participants, rather than prices from trades executed at different times.
The VWAP window used for derivatives will now run from:
instead of the earlier last 30-minute calculation ending at 3:30 PM.
The extended trading session gives derivatives traders additional time to:
According to SEBI, the new mechanism is aimed at improving the efficiency of closing price discovery.
By collecting all buy and sell orders into a single auction pool, the regulator expects the closing price to better represent actual market demand and supply.
Zerodha co-founder Nithin Kamath said the new mechanism could improve price discovery and make execution of large trades more efficient.
He explained that passive funds tracking benchmark indices often execute large trades near the market close to match index levels, and those transactions can move stock prices while being executed, increasing tracking error. According to Kamath, the Closing Auction Session can significantly reduce this problem for index funds and exchange-traded funds.
Kamath also noted that large trades placed in the final minutes of trading can disproportionately influence the closing prices of stocks and indices. Since CAS aggregates all buy and sell orders before matching them at a single price, he said it becomes much harder to influence the market close.
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Pranati Deva is a seasoned financial journalist with over a decade of experience in high-pressure newsroom environments, currently working as a Senior Sub Editor at LiveMint. Over the years, she has developed a reputation for sharp editorial judgement, a strong grasp of market dynamics, and the ability to translate complex financial developments into clear, engaging stories for a wide audience. <br><br> Her core areas of coverage include stock markets, leading listed companies, currencies, and commodities, with a particular strength in fast-paced, real-time market reporting. She is known for handling breaking market news, earnings-driven stock movements, and macroeconomic developments with speed, accuracy, and context—qualities that are essential in financial journalism. <br><br> Pranati has built a diverse and credible professional track record across some of India’s most respected news organisations, including MintGenie, CNBC-TV18, Business Standard and EconomicTimes.com. During her stints at these platforms, she produced data-driven market stories, curated and steered live blogs during volatile trading sessions, and conducted interviews with market veterans, fund managers, economists, and industry experts. Her work often combines on-ground reporting with analytical depth, helping readers make sense of daily market fluctuations and longer-term trends. An alumnus of the Symbiosis Institute of Media and Communications and Hansraj College, University of Delhi, Pranati brings a strong academic foundation to her journalism. She specialises in real-time financial reporting, with a keen focus on precision, balance, and insight, aiming to decode market movements in a way that is both informative and accessible to readers across experience levels.
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