Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Potbelly Corp (PBPB), where a total volume of 2,746 contracts has been traded thus far today, a contract volume which is representative of approximately 274,600 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 184.4% of PBPB's average daily trading volume over the past month, of 148,950 shares..