Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Kroger Co (KR), where a total volume of 20,654 contracts has been traded thus far today, a contract volume which is representative of approximately 2.1 million underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 48.2% of KR's average daily trading volume over the past month, of 4.3 million shares..