Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in United Airlines Holdings Inc (UAL), where a total volume of 42,862 contracts has been traded thus far today, a contract volume which is representative of approximately 4.3 million underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 63.6% of UAL's average daily trading volume over the past month, of 6.7 million shares..