The National Stock Exchange (NSE) has announced revisions to the market lot size of several derivatives contracts for key Indian indices. The changes will take effect from the end of trading on October 28.
As part of the revision, the lot size for Nifty 50 will be reduced to 65 from the earlier 75, while the lot size for Bank Nifty will be reduced to 30 from 35. However, the lot size for Nifty Financial Services will be 60, down from 65, and the lot size for Nifty Mid Select contracts will be reduced to 120 from 140. The lot size for Nifty Next 50 remains unchanged at 25.
Revised lot sizes to take effect after December 30 expiry
The existing lot sizes will continue to apply for weekly and monthly contracts until their December 30, 2025 expiry. For quarterly and half-yearly contracts, lot size revisions will kick in from the end of December 30, 2025.
Additionally, the day spread order book will be disabled temporarily for certain contract combinations — namely November 2025–January 2026, December 2025–January 2026, and December 2025–February 2026.
NSE directs members to alert clients on upcoming lot size changes
NSE has asked its members to alert clients who hold existing positions or plan to initiate fresh positions in quarterly and half-yearly contracts, so they’re aware of the impending changes. Members are also instructed to upload the revised contracts.
“Members are advised to inform their clients who have positions or take any new positions in the quarterly and half yearly contracts, of the upcoming revision in lot size on the below-mentioned dates,” the circular stated.
Lot size revision in line with SEBI’s directive
The revision follows SEBI’s directive for periodic updates to derivative contract specifications, and was calibrated using the average closing price of each underlying index during September 2025.