Changes in Lot Size

What happens to existing contracts during the transition?

The current lot sizes will remain in effect for all weekly and monthly index derivative contracts until their expiry on December 30, 2025. From that date onwards, the revised lot sizes will apply to quarterly and half-yearly contracts as well.

In addition, the NSE will temporarily disable the day spread order book for specific contract combinations — November 2025 - January 2026, December 2025 - January 2026, and December 2025 - February 2026 to ensure a smooth transition to the new framework.