Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Seattle Genetics Inc (Symbol: SGEN), where a total volume of 4,562 contracts has been traded thus far today, a contract volume which is representative of approximately 456,200 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 49.5% of SGEN's average daily trading volume over the past month, of 921,670 shares. Especially high volume was seen for the $60 strike put option expiring June 21, 2019, with 2,000 contracts trading so far today, representing approximately 200,000 underlying shares of SGEN. Below is a chart showing SGEN's trailing twelve month trading history, with the $60 strike highlighted in orange:

Roku Inc (Symbol: ROKU) options are showing a volume of 49,203 contracts thus far today. That number of contracts represents approximately 4.9 million underlying shares, working out to a sizeable 48.4% of ROKU's average daily trading volume over the past month, of 10.2 million shares. Particularly high volume was seen for the $77 strike call option expiring May 10, 2019, with 2,266 contracts trading so far today, representing approximately 226,600 underlying shares of ROKU. Below is a chart showing ROKU's trailing twelve month trading history, with the $77 strike highlighted in orange:

And Constellation Brands Inc (Symbol: STZ) options are showing a volume of 7,600 contracts thus far today. That number of contracts represents approximately 760,000 underlying shares, working out to a sizeable 48.3% of STZ's average daily trading volume over the past month, of 1.6 million shares. Particularly high volume was seen for the $175 strike call option expiring May 17, 2019, with 1,287 contracts trading so far today, representing approximately 128,700 underlying shares of STZ. Below is a chart showing STZ's trailing twelve month trading history, with the $175 strike highlighted in orange:

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