Notable Monday Option Activity: MACK, PFPT, RDNT

Among the underlying components of the Russell 3000 index, we saw noteworthy options trading volume today in Merrimack Pharmaceuticals Inc (MACK), where a total of 582 contracts have traded so far, representing approximately 58,200 underlying shares. That amounts to about 53.7% of MACK's average daily trading volume over the past month of 108,375 shares..