Notable Thursday Option Activity: CBLK, MDR, PCG

Among the underlying components of the Russell 3000 index, we saw noteworthy options trading volume today in Carbon Black Inc (CBLK), where a total of 5,112 contracts have traded so far, representing approximately 511,200 underlying shares. That amounts to about 48.2% of CBLK's average daily trading volume over the past month of 1.1 million shares..
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