SEBI extends F&O trading till 3:40 pm from August 3

A longer trading day begins Monday

From Monday, August 3, India's stock markets will operate under new timings. The Securities and Exchange Board of India (SEBI) has extended the trading hours for derivatives, or F&O, segment by 40 minutes. The market will now close at 3:40 pm instead of the earlier 3:00 pm.

The equity cash segment, however, will continue to trade till 3:00 pm as before. This means the F&O segment will see an additional half-hour-plus of trading after the cash market closes.

Closing auction session: A new mechanism

SEBI has also introduced a closing auction session, a fresh approach to determining the closing price of stocks. The National Stock Exchange (NSE) will adopt this method for closing price discovery starting Monday.

In a closing auction, buy and sell orders are matched at a single price at the end of the trading day. This price then becomes the official closing price for the scrip. The aim is to reduce volatility and manipulation in the last minutes of trading, a period often marked by sharp price swings.

How the session will work

The closing auction will run for a specified period after the regular trading session ends. During this window, investors can place orders that will be executed at a single determined price. The mechanism is expected to bring more transparency to how closing prices are set.

Market participants have been awaiting this change, which aligns Indian markets with global practices. Several international exchanges already use closing auctions to establish end-of-day prices.

What this means for traders and investors

For F&O traders, the extended hours offer more flexibility to hedge positions or react to late-afternoon developments. The additional 40 minutes could also help reduce the gap between cash market close and derivatives settlement.

For regular investors, the closing auction introduces a new way to execute trades near the end of the day. Orders placed during the auction window will be part of a single price discovery process rather than continuous trading.

Analysts suggest the changes could lead to more orderly market closures. The previous system often saw erratic price movements in the final seconds, which the new mechanism aims to curb.

No change to cash market hours

The equity cash segment's trading hours remain unchanged. Investors buying and selling shares directly will continue to operate from the standard opening time to 3:00 pm. Only the derivatives segment sees the extended timeline.

This distinction is crucial for those who trade across both segments. The overlap between cash and F&O trading ends at 3:00 pm, after which only derivatives remain active.

Exchanges have communicated the new schedule to members and are expected to have systems in place for Monday's opening.

Preparing for the transition

Trading members and brokers have been updating their systems to accommodate the new timings and the closing auction mechanism. Investors are advised to check with their brokers about order entry timelines for the auction window.

SEBI's move is part of broader efforts to strengthen market infrastructure and align with international standards. The regulator has not yet indicated whether further changes to trading hours are under consideration.

As markets open on Monday, all eyes will be on how the closing auction functions in practice. The first few sessions will reveal how smoothly the transition unfolds and whether the new mechanism delivers on its promise of fairer price discovery.