NSE has announced new circular on 3 October 2025 a revision in the lot size of F&O contracts of Nifty, Bank Nifty, Fin Nifty, and Midcap Nifty.
- The lot size of Nifty has been revised from 75 to 65
- Bank Nifty: from 35 to 30
- Nifty Financial Services (FinNifty): from 65 to 60
- Nifty Mid Select (Midcap Nifty): from 140 to 120
- No changes in the lot size of Nifty Next 50
The market lot of derivative contracts on the following Index is unchanged:
The following are the other points to be noted:
• For purpose of computation of contract value, the average closing price of the underlying index
has been taken for one-month period of September 2025.
• This circular shall come into effect from October28, 2025 (EOD).
• The existing lot size will be applicable for weekly and monthly contracts till December 30,2025
expiry date. Lot size of existing quarterly and half yearly contracts will be revised on 30-Dec-
2025 EOD. For ease of understanding, a summary has been provided in Annexure.
• The day spread order book will not be available for the combination contract of November 2025
– January 2026, December 2025 – January 2026 and December 2025 – February 2026.
• 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.
• Members are advised to load the updated contract.gz, NSE_FO_contract_ddmmyyyy.csv.gz,
spd_contract.gz and NSE_FO_spdcontract_ddmmyyyy.csv.gz file in the trading application
before trading on respective effective date. This file can be obtained from the directory
faoftp/faocommon on the Extranet server.
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