Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Iron Mountain Inc (IRM), where a total volume of 9,390 contracts has been traded thus far today, a contract volume which is representative of approximately 939,000 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 65.8% of IRM's average daily trading volume over the past month, of 1.4 million shares..