Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Sunrun Inc (RUN), where a total volume of 44,244 contracts has been traded thus far today, a contract volume which is representative of approximately 4.4 million underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 48.5% of RUN's average daily trading volume over the past month, of 9.1 million shares..