Noteworthy Thursday Option Activity: GM, PLCE, SGMO

Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in General Motors Co (GM), where a total volume of 48,712 contracts has been traded thus far today, a contract volume which is representative of approximately 4.9 million underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 44% of GM's average daily trading volume over the past month, of 11.1 million shares..