Sebi Introduces New Stock Market Timings and Closing Auction Session From August 3

The Securities and Exchange Board of India (Sebi) is introducing a revised operational framework starting Monday, August 3. The updates include a dedicated Closing Auction Session for Futures and Options (F&O) eligible stocks, an extension of trading hours for the equity derivatives segment, and adjusted pre-opening timings.

What Happened

Under the new structure, the closing process for F&O-eligible (Category I) stocks moves from standard trading to an auction mechanism. Regular continuous trading for these stocks will end at 3:15 PM, after which they enter a transition phase followed by a multi-stage Closing Auction Session to determine their official closing price.

Sebi has also extended trading in the equity derivatives segment by 10 minutes, allowing trades in this category to continue until 3:40 PM. Non-F&O equity cash stocks are not affected by this change and will continue trading on their usual schedule until 3:30 PM.

Key Highlights

• Regular Trading Cut-off for F&O Stocks: Standard trading for F&O-eligible stocks ends at 3:15 PM, followed by a 5-minute transition period until 3:20 PM.
• Closing Auction Windows: The auction includes CAS Order Entry I from 3:20 PM to 3:25 PM, and CAS Order Entry II from 3:25 PM to 3:30 PM.
• Order Entry Restrictions: Market orders cannot be modified or cancelled during the second order entry window, and the session closes randomly within its final two minutes.
• Order Matching: Matching occurs between 3:30 PM and 3:35 PM to set the official auction closing price for F&O stocks.
• Derivatives Hours Extended: Equity derivatives trading is extended to end at 3:40 PM, while operating hours for other market segments remain unchanged.
• Revised Pre-Opening Timings: Pre-opening order entry takes place between 9:00 AM and 9:07 AM, followed by order matching from 9:07 AM to 9:15 AM before standard market opening.

Why This Matters

According to Sebi, the Closing Auction Session is designed to create a fair and transparent closing price through an auction mechanism. The regulator noted that this framework aims to improve order execution efficiency by aggregating liquidity, provide equal access to all investors, reduce tracking errors for passive funds, and align Indian market operations with international standards.

What to Watch Next

Traders and market participants operating in F&O-eligible stocks and equity derivatives will transition to the new end-of-day timetable starting August 3, while participants in non-F&O cash equity markets will continue using existing trading hours.

Frequently Asked Questions

When do the new market timings come into effect?

The revised trading framework and operating hours apply starting Monday, August 3.

How does this change affect non-F&O cash segment stocks?

Non-F&O equity cash stocks will continue to trade until 3:30 PM with no changes to their operating hours.

What are the extended trading hours for equity derivatives?

Trading in the equity derivatives (F&O) segment has been extended by 10 minutes and will close at 3:40 PM.

Source: Times of India