Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in PubMatic Inc (PUBM), where a total volume of 1,668 contracts has been traded thus far today, a contract volume which is representative of approximately 166,800 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 56.6% of PUBM's average daily trading volume over the past month, of 294,590 shares..