Looking at options trading activity among components of the S&P 500 index, there is noteworthy activity today in Tesla Inc (TSLA), where a total volume of 1.0 million contracts has been traded thus far today, a contract volume which is representative of approximately 101.9 million underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 113.3% of TSLA's average daily trading volume over the past month, of 89.9 million shares..