Among the underlying components of the S&P 500 index, we saw noteworthy options trading volume today in Booking Holdings Inc (BKNG), where a total of 3,320 contracts have traded so far, representing approximately 332,000 underlying shares. That amounts to about 78.8% of BKNG's average daily trading volume over the past month of 421,370 shares. Especially high volume was seen for the $2595 strike call option expiring April 30, 2021, with 105 contracts trading so far today, representing approximately 10,500 underlying shares of BKNG. Below is a chart showing BKNG's trailing twelve month trading history, with the $2595 strike highlighted in orange:

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Today's Most Active Call & Put Options of the S&P 500 »

Merck & Co Inc (MRK) options are showing a volume of 65,161 contracts thus far today. That number of contracts represents approximately 6.5 million underlying shares, working out to a sizeable 64.7% of MRK's average daily trading volume over the past month, of 10.1 million shares. Especially high volume was seen for the $84 strike call option expiring May 21, 2021, with 3,680 contracts trading so far today, representing approximately 368,000 underlying shares of MRK. Below is a chart showing MRK's trailing twelve month trading history, with the $84 strike highlighted in orange:

And DISH Network Corp (DISH) options are showing a volume of 22,825 contracts thus far today. That number of contracts represents approximately 2.3 million underlying shares, working out to a sizeable 60% of DISH's average daily trading volume over the past month, of 3.8 million shares. Especially high volume was seen for the $42.50 strike call option expiring April 30, 2021, with 4,539 contracts trading so far today, representing approximately 453,900 underlying shares of DISH. Below is a chart showing DISH's trailing twelve month trading history, with the $42.50 strike highlighted in orange: