The National Stock Exchange (NSE) has announced a revision in the lot sizes—the minimum number of shares per futures or options (F&O) contract—for four major indices, effective October 28, 2025, according to its latest circular.
Under the revised framework, the Nifty 50 lot size will be reduced from 75 to 65, while the Nifty Bank lot size will drop from 35 to 30. Similarly, the Nifty Financial Services index lot size has been revised from 65 to 60, and the Nifty Mid Select index from 140 to 120. The Nifty Next 50 index lot size remains unchanged.
Traders can continue to use the existing lot sizes until the December 2025 expiry, after which all new contracts—irrespective of their maturity—will adopt the revised, smaller lot sizes.
“The members are advised to inform their clients who have positions or plan to take new positions in quarterly and half-yearly contracts about the upcoming lot size revision,” the NSE stated.
The last expiry with the current lot size for weekly and monthly Nifty contracts will be on December 23, 2025, while the monthly Nifty and Bank Nifty contracts will expire on December 30, 2025.
The NSE periodically adjusts lot sizes of derivatives contracts to maintain contract value within a standardized range, ensuring they remain affordable, liquid, and efficient for market participants. Since derivatives are leveraged instruments, the lot size determines traders’ market exposure and margin requirements, making these revisions essential for balancing accessibility and market stability.
