Among the underlying components of the S&P 500 index, we saw noteworthy options trading volume today in Agilent Technologies, Inc. (A), where a total of 7,742 contracts have traded so far, representing approximately 774,200 underlying shares. That amounts to about 48.5% of A's average daily trading volume over the past month of 1.6 million shares. Especially high volume was seen for the $130 strike call option expiring February 19, 2021, with 1,253 contracts trading so far today, representing approximately 125,300 underlying shares of A. Below is a chart showing A's trailing twelve month trading history, with the $130 strike highlighted in orange:

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

ServiceNow Inc (NOW) saw options trading volume of 6,955 contracts, representing approximately 695,500 underlying shares or approximately 47.4% of NOW's average daily trading volume over the past month, of 1.5 million shares. Especially high volume was seen for the $660 strike call option expiring May 21, 2021, with 706 contracts trading so far today, representing approximately 70,600 underlying shares of NOW. Below is a chart showing NOW's trailing twelve month trading history, with the $660 strike highlighted in orange:

And Garmin Ltd (GRMN) options are showing a volume of 3,291 contracts thus far today. That number of contracts represents approximately 329,100 underlying shares, working out to a sizeable 44.5% of GRMN's average daily trading volume over the past month, of 739,870 shares. Especially high volume was seen for the $135 strike call option expiring February 19, 2021, with 607 contracts trading so far today, representing approximately 60,700 underlying shares of GRMN. Below is a chart showing GRMN's trailing twelve month trading history, with the $135 strike highlighted in orange: