Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in SL Green Realty Corp (SLG), where a total volume of 4,507 contracts has been traded thus far today, a contract volume which is representative of approximately 450,700 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 50.6% of SLG's average daily trading volume over the past month, of 890,760 shares..