Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in KLA Corp (KLAC), where a total volume of 3,850 contracts has been traded thus far today, a contract volume which is representative of approximately 385,000 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 44% of KLAC's average daily trading volume over the past month, of 875,475 shares..