Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Insmed Inc (INSM), where a total volume of 18,526 contracts has been traded thus far today, a contract volume which is representative of approximately 1.9 million underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 152% of INSM's average daily trading volume over the past month, of 1.2 million shares..