Nifty50 NSE F&O Lot Size Reduction

Until December 30, 2025, investors may trade using the current lot sizes. After that, all future contracts of any maturity will use the updated, reduced lot sizes.

NSE Revises Lot Sizes

According to an official circular, the National Stock Exchange (NSE) has changed the lot sizes—that is, the smallest number of shares that may be traded in a single futures or options contract—for four main indices, including the Nifty 50, with effect from October 28.

While the Nifty Bank lot size has decreased from 35 to 30, the Nifty 50 lot size has decreased from 75 to 65. The Nifty Mid Select index lot size was changed from 140 to 120, while the Nifty Financial Services lot size was changed from 65 to 60.

The Nifty Next 50 Index‘s market lot of derivative contracts has not changed.

Until December 30, 2025, investors may trade using the current lot sizes. After that, all future contracts of any maturity will use the updated, reduced lot sizes.

Impact of Lot Changes

In the quarterly and half-yearly contracts, “Members are urged to notify their customers who hold positions or take any new positions, of the anticipated change in lot size on the below-mentioned dates,” the NSE said.

The monthly Nifty and Bank Nifty contracts will expire on December 30, 2025, while the weekly and monthly Nifty contracts will end on December 23, 2025, with the current lot size.

The main reason the NSE modifies the lot sizes of Futures & Options contracts is to maintain the contracts’ affordability and uniformity by keeping the contract value within a predetermined range. Although traders are not obligated to pay the whole contract value up front since derivatives are leveraged securities, the lot size dictates their exposure and the necessary margin. In order to guarantee market efficiency and liquidity, as well as to make contracts more palatable to a wider range of market participants, the NSE revises lot sizes.

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