Noteworthy Friday Option Activity: MRTX, VLO, RARE

Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Mirati Therapeutics Inc (MRTX), where a total volume of 5,570 contracts has been traded thus far today, a contract volume which is representative of approximately 557,000 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 89.9% of MRTX's average daily trading volume over the past month, of 619,720 shares..