Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Horton Inc (DHI), where a total volume of 18,287 contracts has been traded thus far today, a contract volume which is representative of approximately 1.8 million underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 50.4% of DHI's average daily trading volume over the past month, of 3.6 million shares..

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