Looking at options trading activity among components of the S&P 500 index, there is noteworthy activity today in Dollar General Corp (DG), where a total volume of 19,748 contracts has been traded thus far today, a contract volume which is representative of approximately 2.0 million underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 53.7% of DG's average daily trading volume over the past month, of 3.7 million shares..