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 13,527 contracts has been traded thus far today, a contract volume which is representative of approximately 1.4 million underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 207.1% of VSAR's average daily trading volume over the past month, of 653,070 shares. Especially high volume was seen for the $15 strike put option expiring October 20, 2017, with 2,892 contracts trading so far today, representing approximately 289,200 underlying shares of VSAR. Below is a chart showing VSAR's trailing twelve month trading history, with the $15 strike highlighted in orange:

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EXACT Sciences Corp. ( EXAS) saw options trading volume of 27,214 contracts, representing approximately 2.7 million underlying shares or approximately 197.2% of EXAS's average daily trading volume over the past month, of 1.4 million shares. Especially high volume was seen for the $35 strike put option expiring January 18, 2019, with 13,357 contracts trading so far today, representing approximately 1.3 million underlying shares of EXAS. Below is a chart showing EXAS's trailing twelve month trading history, with the $35 strike highlighted in orange:

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And Party City Holdco Inc ( PRTY) options are showing a volume of 3,000 contracts thus far today. That number of contracts represents approximately 300,000 underlying shares, working out to a sizeable 87.9% of PRTY's average daily trading volume over the past month, of 341,440 shares. Particularly high volume was seen for the $12.50 strike put option expiring January 19, 2018, with 3,000 contracts trading so far today, representing approximately 300,000 underlying shares of PRTY. Below is a chart showing PRTY's trailing twelve month trading history, with the $12.50 strike highlighted in orange:

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For the various different available expirations for VSAR options, EXAS options, or PRTY options, visit StockOptionsChannel.com.