Noteworthy Monday Option Activity: KCG, GRA, HUM

Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in KCG Holdings Inc (KCG), where a total volume of 3,273 contracts has been traded thus far today, a contract volume which is representative of approximately 327,300 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 87% of KCG's average daily trading volume over the past month, of 376,180 shares..