Noteworthy Wednesday Option Activity: GRUB, VLO, XXII

Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in GrubHub Inc (GRUB), where a total volume of 5,955 contracts has been traded thus far today, a contract volume which is representative of approximately 595,500 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 59.5% of GRUB's average daily trading volume over the past month, of 1.0 million shares..