why sudden volatility in last 45 min of trade on the contract closing day ??

Its has been my observation that most of the months ... there is a sudden volatility in the last 45 min of the closing day of the contract month ... example today being the last day of october series ... till the last 45 min ... the market was down about 15 - 20 points on the sensex .... the all of a sudden ... the market went up ... to close nearly 120 points up !!!!

a) why does this happen on most of contract ending day ???

b) what are the factors which leads to this sudden volatility ??

c) is there a way to know which side it might go ???

Please advice


Well-Known Member
It was pure fear & panic short covering at the expiry day of the series.

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