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Important Updates on Lot Size Revision for Index Derivatives Contracts
As per the circular issued by NSE (Circular ref. No: NSE/FAOP/70616, dated October 03, 2026), there has been a revision in the market of derivative contracts on certain indices derivatives.
The details of the revised lot size are provided in the table below for your reference:
| Sr. No | Underlying Index | Symbol | Present Market Lot | Revised Market lot |
| 1 | Nifty 50 | NIFTY | 75 | 65 |
| 2 | Nifty Bank | BANKNIFTY | 35 | 30 |
| 3 | Nifty Financial Services | FINNIFTY | 65 | 60 |
| 4 | Nifty Mid Select | MIDCPNIFTY | 140 | 120 |
Applicability for Revised Lot Sizes
| Index Derivatives | Expiration Cycle | Expiry Date | Particulars |
| NIFTY | Quarterly & Half Yearly | 31-Mar-2026 and Above | Lot size of all existing quarterly and half yearly expiry contracts will be revised from December 30, 2025 (EOD) |
| BANKNIFTY | Quarterly | 31-Mar-2026 and Above | Lot size of all existing quarterly expiry contracts will be revised from December 30, 2025 (EOD) |
For more details, please download the NSE annexure here.
Note:
- This circular has come into effect at the end of day (EOD) on October 28, 2025.
- The day spread order book will not be available for the following combination contracts:
- December 2025 – January 2026
- December 2025 – February 2026
Advisory for Clients with Open Positions
Please note that clients with open positions in NIFTY and BANKNIFTY expiring on 31 March 2026 and beyond contracts are required to choose one of the following options:
Option 1: Adjust your position to align with the updated market lot size on or before the specified transition date.
Option 2:Square off your existing odd lot position before the new lot size is applied.
Important:
- If no action is taken, odd lot short positions (positions not in multiples of the valid market lot size) will be squared off by RMS before the specified transition date.
- After the lot size adjustment, you will not be able to square off the odd-lot open quantity.
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