Nifty Lot Size 2026: 65 Units for Nifty 50. Full F&O Index List
The complete 2026 F&O lot size list, updated for all indices after SEBI's latest contract changes.
- Nifty 50: 65 units (revised from 75)
- Bank Nifty: 30 units (revised from 35)
- Sensex: 20 units (revised from 10)
- FINNIFTY: 60 units
- MIDCPNIFTY: 120 units
Nifty lot size has been revised from January 1, 2026, following changes in index derivatives contract specifications on the National Stock Exchange of India (NSE). The updated structure applies to all weekly, monthly, and quarterly contracts expiring from January 2026 onward.
This article explains the revised contract sizes for major indices, including nifty 50 lot size, bank nifty lot size, and sensex lot size, along with transition rules and expiry handling.
Current Index Lot Sizes (Effective January 2026)
| Index | Symbol | Old Lot Size | Current Lot Size (Jan 2026) |
|---|---|---|---|
| Nifty 50 | NIFTY | 75 | 65 |
| Bank Nifty | BANKNIFTY | 35 | 30 |
| Nifty Financial Services | FINNIFTY | 65 | 60 |
| Nifty Mid Select | MIDCPNIFTY | 140 | 120 |
| BSE Sensex | SENSEX | 10* | 20 |
Note:
- The nifty 50 lot size is now 65.
- The bank nifty lot size is now 30.
- Nifty Next 50 continues with a lot size of 25.
- The SENSEX lot size remains at 20 in 2026.
- The Sensex lot size was increased from 10 to 20 earlier in 2025 after a regulatory review.
- No additional revisions were announced for Sensex alongside the January 2026 NSE changes.
Expiry Cut-Off: Transition to the New Structure
The change followed a defined expiry-based cut-off.
- All contracts expiring up to December 30, 2025 traded with old lot sizes.
- All contracts expiring January 2026 onward use revised lot sizes.
- Existing quarterly and half-yearly contracts were aligned after the December 2025 monthly expiry.
December 2025 expiry was the final boundary between the two lot structures.
Q1 2026 Quarterly Contracts and Lot Sizes
All quarterly contracts in Q1 2026 use the revised lot sizes.
Quarterly Expiries in Q1 2026
- January 2026
- February 2026
- March 2026 (Quarter-ending expiry)
Lot sizes applicable:
- Nifty: 65
- Bank Nifty: 30
- FINNIFTY: 60
- MIDCPNIFTY: 120
There are no legacy contracts with older lot sizes in Q1 2026.
March 2026 Expiry Under the New Regime
March 2026 is the first full quarter-ending expiry operating entirely under the revised structure.
Key structural implications:
- Lower notional exposure per lot compared to March 2025
- Updated hedge quantity alignment for rollover contracts
- Adjustments in quantity-based risk parameters
All contracts in March 2026 reflect uniform lot sizing across expiries.
Why Lot Sizes Are Revised Periodically
Lot sizes are reviewed to maintain manageable contract values as index levels change.
This supports:
- Controlled per-lot exposure
- Efficient capital deployment
- Improved market liquidity
- Balanced contract participation
As index values rise, notional contract value also increases. Adjusting lot sizes helps maintain proportional exposure.
Impact of Revised Lot Sizes on Contract Structure
1. Lower Exposure per Contract
Smaller lot sizes reduce notional exposure per lot.
For example:
- Earlier Nifty contract: 75 units
- Current Nifty contract: 65 units
This directly changes contract value calculation.
2. Position Size Calculations
Total exposure now depends on:
- Number of lots
- Strike price (for options)
- Futures price level
A fixed number of lots now represents a different total contract value compared to 2025.
3. Effect on Option Contracts
The nifty option lot size and nifty futures lot size now align with the revised contract specifications.
Changes may affect:
- Per-lot margin requirements
- Breakeven value calculations
- Quantity-based exposure metrics
Total margin still depends on:
- Volatility
- Strike selection
- Number of contracts
- Broker-level risk framework
4. Spread and Calendar Contracts
Certain day-spread order books were restricted around the transition period. This applied to some combinations during contract migration. Post-transition, contracts operate under uniform sizing.
Sensex and BSE Lot Size Clarification
The bse lot size for Sensex derivatives remains 20 in 2026.
The increase from 10 to 20 occurred earlier in 2025. No additional changes were introduced alongside the January 2026 NSE revisions. The revision aligned Sensex contract value more closely with peer index contracts.
Uniformity Across Expiry Types
From January 2026 onward:
- Weekly contracts use revised lot sizes
- Monthly contracts use revised lot sizes
- Quarterly contracts use revised lot sizes
There is no variation in lot size based on expiry type.
Frequently asked questions
What is the current Nifty lot size in 2026?
As of January 2026, the Nifty 50 lot size is 65. This applies to all weekly, monthly, and quarterly contracts, including the March 2026 quarterly expiry.
What is the Bank Nifty lot size now?
The current Bank Nifty lot size is 30, reduced from 35 earlier. This lot size is applicable for all expiries from January 2026 onward.
When did Nifty and Bank Nifty lot sizes change?
The revised lot sizes became effective from January 1, 2026. All contracts expiring up to December 30, 2025 traded with the old lot sizes, while January 2026 and later expiries reflect the new structure.
Does the new lot size apply to March 2026 expiry?
Yes. The March 2026 quarterly expiry fully uses the new lot sizes:
Is the Nifty lot size different for weekly, monthly, and quarterly contracts?
No. From January 2026 onward, the lot size is uniform across all expiries—weekly, monthly, and quarterly—for each index.
Why did NSE reduce Nifty and Bank Nifty lot sizes?
Lot sizes are revised periodically to keep contract values manageable as index levels rise. The 2026 changes aim to:
Did Sensex lot size also change in 2026?
No. The Sensex lot size remains at 20 in 2026. It was increased from 10 to 20 earlier in 2025, and no further changes were announced alongside the January 2026 NSE revisions.
Has Nifty Next 50 lot size changed?
No. Nifty Next 50 (NIFTYNXT50) continues with a lot size of 25, with no revisions announced.
How does the new lot size affect option sellers?
Option sellers may see changes in:
Will margin requirements reduce due to lower lot sizes?
Margins may reduce per lot, but total margin depends on:
Do I need to change quantities while rolling over positions?
Yes. Rolling over positions from pre-2026 contracts without adjusting quantities can lead to:
Investments in the securities market are subject to market risks. Read all related documents carefully before investing. This post is for learning, not a recommendation.
