All securities are classified into three groups for the purpose of VaR margin

• For the securities listed in Group I, scrip wise daily volatility calculated using the exponentially weighted moving average methodology is applied to daily returns. The scrip wise daily VaR is 3.5 times the volatility so calculated subject to a minimum of 7.5%.
• For the securities listed in Group II, the VaR margin is higher of scrip VaR (3.5 sigma) or three times the index VaR, and it is scaled up by root 3.
• For the securities listed in Group III the VaR margin is equal to five times the index VaR and scaled up by root 3.

The index VaR, for the purpose, is the higher of the daily Index VaR based on CNX NIFTY or BSE SENSEX, subject to a minimum of 5%.

NSE CLEARING may stipulate security specific margins from time to time.

The VaR margin rate computed as mentioned above is charged on the net outstanding position (buy value-sell value) of the respective clients on the respective securities across all open settlements. There is no netting off of positions across different settlements. The net position at a client level for a member is arrived at and thereafter, it is grossed across all the clients including proprietary position to arrive at the gross open position.

For example, in case of a member, if client A has a buy position of 1000 in a security and client B has a sell position of 1000 in the same security, the net position of the member in the security is taken as 2000. The buy position of client A and sell position of client B in the same security is not netted. It is summed up to arrive at the member's open position for the purpose of margin calculation.

The VaR margin is collected on an upfront basis by adjusting against the total liquid assets of the member at the time of trade.

The VaR margin so collected is released on completion of pay-in of the settlement or on individual completion of full obligations of funds and securities by the respective member/custodians after crystallization of the final obligations on T+1 day.

The Extreme Loss Margin for any security is higher of:

• 5%, or
• 1.5 times the standard deviation of daily logarithmic returns of the security price in the last six months. This computation is done at the end of each month by taking the price data on a rolling basis for the past six months and the resulting value is applicable for the next month.

The Extreme Loss Margin is collected/ adjusted against the total liquid assets of the member on a real time basis.

The Extreme Loss Margin is collected on the gross open position of the member. The gross open position for this purpose means the gross of all net positions across all the clients of a member including its proprietary position.

There is no netting off of positions across different settlements. The Extreme Loss Margin collected is released on completion of pay-in of the settlement or on individual completion of full obligations of funds and securities by the respective member/custodians after crystallization of the final obligations on T+1 day.

Mark to market loss is calculated by marking each transaction in security to the closing price of the security at the end of trading. In case the security has not been traded on a particular day, the latest available closing price at NSE is considered as the closing price. In case the net outstanding position in any security is nil, the difference between the buy and sell values shall be is considered as notional loss for the purpose of calculating the mark to market margin payable.

The mark to market margin (MTM) is collected from the member before the start of the trading of the next day.

The MTM margin is collected/adjusted from/against the cash/cash equivalent component of the liquid net worth deposited with the Exchange.

The MTM margin is collected on the gross open position of the member. The gross open position for this purpose means the gross of all net positions across all the clients of a member including its proprietary position. For this purpose, the position of a client is netted across its various securities and the positions of all the clients of a member are grossed.

There is no netting off of the positions and setoff against MTM profits across two rolling settlements i.e. T day and T+1 day. However, for computation of MTM profits/losses for the day, netting or setoff against MTM profits is permitted.