Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Altra Industrial Motion Corp (AIMC), where a total volume of 1,416 contracts has been traded thus far today, a contract volume which is representative of approximately 141,600 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 43.5% of AIMC's average daily trading volume over the past month, of 325,310 shares..