Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Redfin Corp (RDFN), where a total volume of 21,503 contracts has been traded thus far today, a contract volume which is representative of approximately 2.2 million underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 52.2% of RDFN's average daily trading volume over the past month, of 4.1 million shares..