Notable Thursday Option Activity: MCK, GM, BHGE

Looking at options trading activity among components of the S&P 500 index, there is noteworthy activity today in McKesson Corp (MCK), where a total volume of 7,138 contracts has been traded thus far today, a contract volume which is representative of approximately 713,800 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 44.5% of MCK's average daily trading volume over the past month, of 1.6 million shares..