Looking at options trading activity among components of the S&P 500 index, there is noteworthy activity today in Valero Energy Corp (Symbol: VLO), where a total volume of 18,094 contracts has been traded thus far today, a contract volume which is representative of approximately 1.8 million underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 55.9% of VLO's average daily trading volume over the past month, of 3.2 million shares. Particularly high volume was seen for the $375 strike put option expiring September 25, 2026 , with 1,403 contracts trading so far today, representing approximately 140,300 underlying shares of VLO.
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