Notable Monday Option Activity: PSX, GAS, APD

Among the underlying components of the S&P 500 index, we saw noteworthy options trading volume today in Phillips 66 (PSX), where a total of 24,809 contracts have traded so far, representing approximately 2.5 million underlying shares. That amounts to about 78.2% of PSX's average daily trading volume over the past month of 3.2 million shares..