Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Magnite Inc (MGNI), where a total volume of 9,893 contracts has been traded thus far today, a contract volume which is representative of approximately 989,300 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 58.7% of MGNI's average daily trading volume over the past month, of 1.7 million shares..