$WRB Just to let you know, this has happened many times in past(8 out of 10 times) when a company leaves s&p mid cap index or any other index it drops because the funds houses which track these index they have to sell their holdings in order to re balance their portfolio accordingly. However if the stock is not part of any index and then gets added then it jumps on the news. Hope it clears. You will see this in future too.
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