Looking at options trading activity among components of the S&P 500 index, there is noteworthy activity today in Costco Wholesale Corp (Symbol: COST), where a total volume of 18,631 contracts has been traded thus far today, a contract volume which is representative of approximately 1.9 million underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 94.8% of COST's average daily trading volume over the past month, of 2.0 million shares. Particularly high volume was seen for the $895 strike put option expiring September 18, 2026 , with 524 contracts trading so far today, representing approximately 52,400 underlying shares of COST.
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