Revision in Market Lot Sizes for Stock and Index Derivative Contracts on NSE and BSE
As per the circulars issued by NSE and BSE on 30th September 2026, the market lot sizes for derivative contracts on select individual stocks and indices have been revised in line with SEBI guidelines. The revised lot sizes will come into effect from 28th October 2026 on NSE and 30th October 2026 on BSE, depending on the contract expiry.
Summary of Changes
Category | NSE | BSE |
|---|---|---|
Reduced lot size | 7 stocks | 7 stocks |
Increased lot size | 27 stocks | 27 stocks and 1 index (SENSEX) |
Special cases (non-multiple revision) | 9 stocks | 9 stocks |
No change | 167 stocks | 165 stocks and 3 indices |
Revision in BSE SENSEX Lot Size
The lot size for BSE SENSEX derivative contracts will increase effective 30th October 2026, for contracts expiring in January 2027 and onwards.
Index | Present Lot Size | Revised Lot Size | Applicable From |
|---|---|---|---|
BSE SENSEX | 20 | 25 | January 2027 expiry onwards |
November and December 2026 expiry contracts will continue with the existing lot size of 20.
When Will These Changes Apply?
Change Type | NSE Effective From | BSE Effective From |
|---|---|---|
Reduced lot size | 28th October 2026, for November 2026 expiry onwards | 30th October 2026, for November 2026 expiry onwards |
Increased lot size | 28th October 2026, for January 2027 expiry onwards | 30th October 2026, for January 2027 expiry onwards |
Special cases | 28th October 2026, for January 2027 expiry onwards | 30th October 2026, for January 2027 expiry onwards |
No change | All expiries | All expiries |
Important: November and December 2026 expiry contracts will continue with the existing lot sizes for stocks with increased lot sizes or special non-multiple revisions. The revised lot sizes will apply from January 2027 expiry onwards.
For NSE, the day spread order book will not be available for December 2026–January 2027 expiry combinations for contracts covered under the upward and non-multiple revisions.
What This Means
- Contract values and margin requirements may change based on the revised lot sizes.
- Order quantities must match the applicable lot size for the selected contract expiry.
- Certain spread combinations may not be available during the transition.
What Should Be Done
- Check whether open positions are affected by the revised lot sizes.
- Ensure order quantities match the revised lot sizes for the applicable expiry.
- Review existing positions and adjust or square off positions where necessary.
Note: BAJAJHLDNG, IEX and IREDA were excluded from the lot size review due to their removal from the F&O segment.
For complete stock-wise details, including present and revised lot sizes, refer to the annexures provided in the exchange circulars below.
- NSE Circular - Ref No: NSE/FAOP/76657 | Circular No: 134/2026 | Dated: 30th September 2026
- BSE Notice - Notice No: 20260930-58 | Dated: 30th September 2026