Looking at options trading activity among components of the S&P 500 index, there is noteworthy activity today in Costco Wholesale Corp (NASD: COST), where a total volume of 15,074 contracts has been traded thus far today, a contract volume which is representative of approximately 1.5 million underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 87% of COST's average daily trading volume over the past month, of 1.7 million shares. Particularly high volume was seen for the $155 strike put option expiring September 16, 2016, with 3,767 contracts trading so far today, representing approximately 376,700 underlying shares of COST. Below is a chart showing COST's trailing twelve month trading history, with the $155 strike highlighted in orange:
|