Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Vail Resorts Inc (MTN), where a total volume of 1,642 contracts has been traded thus far today, a contract volume which is representative of approximately 164,200 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 42.8% of MTN's average daily trading volume over the past month, of 383,885 shares..