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Index based market wide circuit breaker for Q3 CY12
30 Jun 2012, 01:00 PM
The BSE implements on a quarterly basis the index based market wide circuit breaker system. The system is applicable at three stages of the index movement either way at 10%, 15% and 20%. This circuit breaker brings about a coordinated trading halt in all equity and equity derivative markets nationwide.

The market wide circuit breakers would be triggered by movement of either SENSEX or the NSE S&P CNX Nifty whichever is breached earlier.

In case of a 10% movement of either of these indices, there would be a 1-hour market halt if the movement takes place before 1 p.m. In case the movement takes place at or after 1 p.m. but before 2.30 p.m. there will be a trading halt for hour. In case the movement takes place at or after 2.30 p.m. there will be no trading halt at the 10% level and the market will continue trading.

In case of a 15% movement of either index, there will be a 2-hour market halt if the movement takes place before 1 p.m. If the 15% trigger is reached on or after 1 p.m. but before 2 p.m., there will be a 1 hour halt. If the 15% trigger is reached on or after 2 p.m. the trading will halt for the remainder of the day.

In case of a 20% movement of the index, the trading will be halted for the remainder of the day.

The percentages are calculated on the closing index value of the quarter. These percentages are translated into absolute points of index variations (rounded off to the nearest 25 points in case of SENSEX). At the end of each quarter, these absolute points of index variations are revised and made applicable for the next quarter.

On June 29, 2012, the last trading day of the quarter, SENSEX closed at 17429.98 points. The absolute points of SENSEX variation (over the previous days closing SENSEX) which would trigger market wide circuit breaker for any day in the quarter between 1st July, 2012 and 30th September, 2012 would be as under:

 
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