Notable Monday Option Activity: MRK, FLR, ISRG

Among the underlying components of the Russell 3000 index, we saw noteworthy options trading volume today in Merck & Co Inc (MRK), where a total of 36,567 contracts have traded so far, representing approximately 3.7 million underlying shares. That amounts to about 45% of MRK's average daily trading volume over the past month of 8.1 million shares..