Notable Monday Option Activity: TSO, EIX, ISRG
July 20, 2015 at 14:02 PM EDT
Looking at options trading activity among components of the S&P 500 index, there is noteworthy activity today in Tesoro Corporation (TSO), where a total volume of 26,429 contracts has been traded thus far today, a contract volume which is representative of approximately 2.6 million underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 99.4% of TSO's average daily trading volume over the past month, of 2.7 million shares..