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14 Nov 2025
NSE Lot Size Revision for Index Derivatives – Nifty, Bank Nifty, Fin Services
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NSE Revises Lot Sizes for Key Index Derivatives: What Traders Must Know
Circular Date: October 4, 2025 Issued By: National Stock Exchange of India (NSE) Time of Release: 6:35 PM IST
Official Reference Link: Read full article on NSE lot-size revision (source: Financial Express)
Introduction
The National Stock Exchange of India (NSE) has announced a revision in the market lot sizes for several major index derivative contracts. The changes were announced on 4 October 2025, with the new lot sizes becoming effective from the end of trading on 30 December 2025.
Under the revised structure:
- Nifty 50 index futures/options lot size reduced from 75 to 65 units
- Bank Nifty index lot size reduced from 35 to 30 units
- Nifty Financial Services index lot size reduced from 65 to 60 units
- Nifty Mid Select index lot size reduced from 140 to 120 units
These changes aim to align contract values with current index levels, improve affordability for retail participants and enhance liquidity.
Why NSE Made the Change
1. Aligning Contract Value With Index Levels
NSE periodically revises contract specifications to ensure contract values stay economically viable and aligned with market conditions.
2. Encouraging Retail Participation
Lowering the number of units per contract reduces the capital required to initiate a derivatives position, making index trading more accessible for retail traders.
3. Market and Regulatory Alignment
The revision aligns with SEBI’s expectation that exchanges maintain contract usability and market efficiency through periodic review.
Detailed Summary of Changes
| Underlying Index | Old Lot Size | New Lot Size | Effective Date |
|---|---|---|---|
| Nifty 50 | 75 | 65 | 30 Dec 2025 (EOD) |
| Bank Nifty | 35 | 30 | 30 Dec 2025 (EOD) |
| Nifty Fin Services | 65 | 60 | 30 Dec 2025 (EOD) |
| Nifty Mid Select | 140 | 120 | 30 Dec 2025 (EOD) |
*Existing monthly/weekly contracts retain old lot sizes until expiry on 30 December 2025.*
What This Means for Traders and Investors
Lower Capital Requirement
Reduced lot size means lower capital or margin requirement to initiate futures/options positions, improving entry affordability.
Improved Liquidity and Spread Tightening
Smaller contract sizes typically attract more participants, resulting in higher volume, tighter bid-ask spreads and better price discovery.
Changes in Strategy and Risk Management
Existing strategies such as hedges, spreads and multi-leg positions must be recalibrated to the new lot sizes.
Transitional Considerations
- Contracts expiring before 30 December retain old lot sizes
- Quarterly and long-duration contracts must be adjusted before the effective date
- Brokers must communicate changes to clients
Frequently Asked Questions
Will trading costs drop significantly?
Costs reduce partly due to lower effective position size, but margins still depend on volatility, index level and broker policies.
Does this apply to stock derivatives?
No. This revision applies only to index derivatives.
How should traders adjust?
Traders must review their open positions, check margin requirements after the change and align their risk-management frameworks.
Timeline and Implementation
- Announcement Date: 4 October 2025
- Effective Date: End of day 30 December 2025
- Old Lot Sizes: Applicable until contract expiry on or before 30 December
- System Updates: Brokers and trading members must update contract files before effective date
Final Takeaway
NSE’s lot size revision is a significant step to improve participation and align contract specifications with changing market needs. For retail traders, it reduces the entry barrier to derivatives trading. For institutional players, it enhances liquidity and market depth. Traders should prepare for the transition, update their systems and adjust their margin strategies before the new lot sizes come into effect.
