Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Signet Jewelers Ltd (SIG), where a total volume of 4,480 contracts has been traded thus far today, a contract volume which is representative of approximately 448,000 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 56.4% of SIG's average daily trading volume over the past month, of 793,680 shares..