Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Planet Fitness Inc (PLNT), where a total volume of 17,868 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 161.8% of PLNT's average daily trading volume over the past month, of 1.1 million shares..