Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Post Holdings Inc (POST), where a total volume of 6,079 contracts has been traded thus far today, a contract volume which is representative of approximately 607,900 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 150.6% of POST's average daily trading volume over the past month, of 403,645 shares..