Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Catasys Inc (CATS), where a total volume of 3,595 contracts has been traded thus far today, a contract volume which is representative of approximately 359,500 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 104.7% of CATS's average daily trading volume over the past month, of 343,245 shares..