Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in iRobot Corp (IRBT), where a total volume of 4,280 contracts has been traded thus far today, a contract volume which is representative of approximately 428,000 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 100.4% of IRBT's average daily trading volume over the past month, of 426,175 shares..