NSE Shifts Derivatives Expiry To Tuesday, BSE Keeps Thursday: What It Means For Volatility And Trading Patterns

September 2, 2025: The National Stock Exchange (NSE) and the Bombay Stock Exchange (BSE) have announced that they have made changes to the day on which derivatives expire.

The Calendar Reset

The National Stock Exchange will now have derivative contracts with weekly and monthly expiry on Tuesdays. On the other hand, the Bombay Stock Exchange will have the expiries on Thursdays.

The Reason for The Shift

This comes after a directive asking both the stock exchanges to either shift the expiration dates to Tuesdays or Thursdays. The main aim is to curb derivative volatility, which rises when derivative contracts expire on multiple days.

Why Does This Change Matter?

Before the shift to different days, both NSE and BSE had Thursday expiry for both the weekly and monthly derivative contracts. As a result, there was a huge rush of traders on Thursdays to close or roll over their contracts all at once. This process concentrated the trading pressure on a single day, often leading to sudden and unpredictable price swings, resulting in high volatility.

Now, as both the exchanges will have different expiration days, the overall trading pressure will be spread out, and the volatility will reduce. With NSE’s expiry now on Tuesdays, trading pressure is expected on Mondays and Tuesdays, leaving the rest of the week for derivative contracts that trade on the BSE.

Weekend Time Decay

One other positive factor is the weekend time decay. Weekend time decay is the phenomenon included in the process of derivative trading where the value of the contract decreases over the weekend, even when the market is closed.

Now, short-term and intraday traders can avoid this weekend time decay by utilising the NSE’s Tuesday expiry. On the other hand, positional traders can use BSE’s Thursday expiry to have longer holding periods.

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