Looking at options trading activity among components of the S&P 500 index, there is noteworthy activity today in Booking Holdings Inc (BKNG), where a total volume of 2,492 contracts has been traded thus far today, a contract volume which is representative of approximately 249,200 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 110.9% of BKNG's average daily trading volume over the past month, of 224,625 shares..