The National Stock Exchange of India (NSE) has announced a revision in the market lot size for derivative contracts across four key indices, including the flagship Nifty 50 and Nifty Bank. The changes, mandated by the Securities and Exchange Board of India (SEBI) guidelines for periodic lot size review, aim to adjust the notional contract value and will come into effect from October 28, 2025 (End of Day).
The revision was calculated based on the average closing price of the underlying indices during the one-month period of September 2025.
| Underlying Index | Symbol | Present Market Lot | Revised Market Lot |
| Nifty 50 | NIFTY | 75 | 65 |
| Nifty Bank | BANKNIFTY | 35 | 30 |
| Nifty Financial Services | FINNIFTY | 65 | 60 |
| Nifty Mid Select | MIDCPNIFTY | 140 | 120 |
| Nifty Next 50 | NIFTYNXT50 | 25 | 25 (Unchanged) |
The new lot sizes will be implemented in a phased manner, depending on the contract's expiry cycle:
The NSE has advised its members to inform clients who hold existing positions or plan to initiate new positions in the quarterly and half-yearly contracts about the upcoming revision.
The circular also noted that the day spread order book will be disabled for the following contract combinations during the transition period:
Trading members are also required to update their systems with the latest contract files provided by the exchange on the extranet server before the respective effective date.
The Nifty futures contract that previously represented 75 units of the index will now represent 65 units starting December 30, 2025. The following are the effects that investors & traders have to consider while trading in the markets:
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