Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Coherus BioSciences Inc (CHRS - Get Report), where a total volume of 3,847 contracts has been traded thus far today, a contract volume which is representative of approximately 384,700 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 47.2% of CHRS's average daily trading volume over the past month, of 814,875 shares. Especially high volume was seen for the $15 strike put option expiring June 16, 2017, with 893 contracts trading so far today, representing approximately 89,300 underlying shares of CHRS. Below is a chart showing CHRS's trailing twelve month trading history, with the $15 strike highlighted in orange:

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bluebird bio Inc ( BLUE) saw options trading volume of 5,591 contracts, representing approximately 559,100 underlying shares or approximately 47% of BLUE's average daily trading volume over the past month, of 1.2 million shares. Particularly high volume was seen for the $125 strike call option expiring August 18, 2017, with 2,058 contracts trading so far today, representing approximately 205,800 underlying shares of BLUE. Below is a chart showing BLUE's trailing twelve month trading history, with the $125 strike highlighted in orange:

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And Science Applications International Corp ( SAIC) options are showing a volume of 1,326 contracts thus far today. That number of contracts represents approximately 132,600 underlying shares, working out to a sizeable 43.9% of SAIC's average daily trading volume over the past month, of 301,820 shares. Especially high volume was seen for the $80 strike call option expiring June 16, 2017, with 285 contracts trading so far today, representing approximately 28,500 underlying shares of SAIC. Below is a chart showing SAIC's trailing twelve month trading history, with the $80 strike highlighted in orange:

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