Freeze quantity refers to the maximum number of lots a trader can buy or sell in a single for a particular equity or index F&O contract. If the number of lots exceeds the freeze quantity then your order will be rejected. In order to buy more lots you can choose to place another order with a quantity that is less than or equal to the maximum defined quantity as defined by the exchanges.

The purpose of the freeze quantity is to:

• Prevent market manipulation: By limiting the number of contracts that can be traded in a single order, the exchanges aim to prevent large from artificially inflating or deflating the price of an underlying security or index.
• Maintain market stability: Large orders can create significant volatility in the market, and the freeze quantity helps to ensure that the market remains orderly and .
• Protect individual investors: The freeze quantity can help to protect individual investors from being taken advantage of by larger, more sophisticated traders.