Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Benefitfocus Inc (BNFT), where a total volume of 1,042 contracts has been traded thus far today, a contract volume which is representative of approximately 104,200 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 54.2% of BNFT's average daily trading volume over the past month, of 192,240 shares. Particularly high volume was seen for the $12.50 strike put option expiring May 21, 2021, with 1,006 contracts trading so far today, representing approximately 100,600 underlying shares of BNFT. Below is a chart showing BNFT's trailing twelve month trading history, with the $12.50 strike highlighted in orange:

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

United Natural Foods Inc. (UNFI) saw options trading volume of 5,341 contracts, representing approximately 534,100 underlying shares or approximately 53.6% of UNFI's average daily trading volume over the past month, of 995,975 shares. Especially high volume was seen for the $35 strike put option expiring August 20, 2021, with 1,671 contracts trading so far today, representing approximately 167,100 underlying shares of UNFI. Below is a chart showing UNFI's trailing twelve month trading history, with the $35 strike highlighted in orange:

And Papa John's International, Inc. (PZZA) options are showing a volume of 1,828 contracts thus far today. That number of contracts represents approximately 182,800 underlying shares, working out to a sizeable 53.6% of PZZA's average daily trading volume over the past month, of 341,355 shares. Particularly high volume was seen for the $70 strike put option expiring June 11, 2021, with 280 contracts trading so far today, representing approximately 28,000 underlying shares of PZZA. Below is a chart showing PZZA's trailing twelve month trading history, with the $70 strike highlighted in orange: