Notable Friday Option Activity: GBT, MDT, UNP

Among the underlying components of the Russell 3000 index, we saw noteworthy options trading volume today in Global Blood Therapeutics Inc (GBT), where a total of 5,162 contracts have traded so far, representing approximately 516,200 underlying shares. That amounts to about 50.4% of GBT's average daily trading volume over the past month of 1.0 million shares..
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