Noteworthy Monday Option Activity: CSTL, ISEE, DOCS

Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Castle Biosciences Inc (CSTL), where a total volume of 2,142 contracts has been traded thus far today, a contract volume which is representative of approximately 214,200 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 95.5% of CSTL's average daily trading volume over the past month, of 224,370 shares..