Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in ACM Research Inc (ACMR), where a total volume of 4,826 contracts has been traded thus far today, a contract volume which is representative of approximately 482,600 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 41% of ACMR's average daily trading volume over the past month, of 1.2 million shares..