Notable Thursday Option Activity: GM, ATVI, TWTR

Among the underlying components of the S&P 500 index, we saw noteworthy options trading volume today in General Motors Co (GM), where a total of 85,079 contracts have traded so far, representing approximately 8.5 million underlying shares. That amounts to about 53.4% of GM's average daily trading volume over the past month of 15.9 million shares..