Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in IGM Biosciences Inc (IGMS), where a total volume of 2,044 contracts has been traded thus far today, a contract volume which is representative of approximately 204,400 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 57.9% of IGMS's average daily trading volume over the past month, of 352,815 shares. Especially high volume was seen for the $22.50 strike put option expiring May 20, 2022, with 2,000 contracts trading so far today, representing approximately 200,000 underlying shares of IGMS. Below is a chart showing IGMS's trailing twelve month trading history, with the $22.50 strike highlighted in orange:

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

Insulet Corp (PODD) saw options trading volume of 2,856 contracts, representing approximately 285,600 underlying shares or approximately 55.8% of PODD's average daily trading volume over the past month, of 512,255 shares. Particularly high volume was seen for the $130 strike put option expiring September 16, 2022, with 1,100 contracts trading so far today, representing approximately 110,000 underlying shares of PODD. Below is a chart showing PODD's trailing twelve month trading history, with the $130 strike highlighted in orange:

And Tattooed Chef Inc (TTCF) options are showing a volume of 3,484 contracts thus far today. That number of contracts represents approximately 348,400 underlying shares, working out to a sizeable 55.4% of TTCF's average daily trading volume over the past month, of 628,895 shares. Especially high volume was seen for the $7 strike put option expiring May 13, 2022, with 621 contracts trading so far today, representing approximately 62,100 underlying shares of TTCF. Below is a chart showing TTCF's trailing twelve month trading history, with the $7 strike highlighted in orange: