How is the Index value computed during CAS?

As mentioned in the circular 73362 dated March 18, 2026, Dissemination of Indicative index during CAS shall be as follows:

1. Since the CAS mechanism shall be implemented in phased manner, it is possible that certain constituents of any index are trading in CAS whereas remaining constituents of same index are trading in Continuous Trading Session (CTS) simultaneously. Thus, Exchange shall disseminate
   both the actual index value and the indicative index close value, during the CAS.
2. Actual index value when CAS is in progress shall be computed considering its constituents prices as below:
   2.1. Stocks for which CAS is not applicable: Real time LTP of CTS as per current logic
   2.2. Stocks for which CAS is applicable: LTP of CTS
3. Indicative index close value when CAS is in progress shall be computed considering its constituents prices as below:
   3.1. Stocks for which CAS is not applicable: VWAP of all the trades from 3.00PM onwards.
   3.2. Stocks for which CAS is applicable: Indicative equilibrium price of the stock during CAS

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