Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Versartis Inc (VSAR), where a total volume of 1,652 contracts has been traded thus far today, a contract volume which is representative of approximately 165,200 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 56.8% of VSAR's average daily trading volume over the past month, of 291,100 shares. Especially high volume was seen for the $10 strike put option expiring October 20, 2017, with 469 contracts trading so far today, representing approximately 46,900 underlying shares of VSAR. Below is a chart showing VSAR's trailing twelve month trading history, with the $10 strike highlighted in orange:

Loading+chart++2017+TickerTech.com

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

Aimmune Therapeutics Inc ( AIMT) saw options trading volume of 1,015 contracts, representing approximately 101,500 underlying shares or approximately 56% of AIMT's average daily trading volume over the past month, of 181,160 shares. Especially high volume was seen for the $22.50 strike call option expiring October 20, 2017, with 1,001 contracts trading so far today, representing approximately 100,100 underlying shares of AIMT. Below is a chart showing AIMT's trailing twelve month trading history, with the $22.50 strike highlighted in orange:

Loading+chart++2017+TickerTech.com

And Weatherford International plc ( WFT) options are showing a volume of 61,903 contracts thus far today. That number of contracts represents approximately 6.2 million underlying shares, working out to a sizeable 51.3% of WFT's average daily trading volume over the past month, of 12.1 million shares. Especially high volume was seen for the $4.50 strike call option expiring October 20, 2017, with 24,555 contracts trading so far today, representing approximately 2.5 million underlying shares of WFT. Below is a chart showing WFT's trailing twelve month trading history, with the $4.50 strike highlighted in orange:

Loading+chart++2017+TickerTech.com

For the various different available expirations for VSAR options, AIMT options, or WFT options, visit StockOptionsChannel.com.