Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Horizon Pharma plc (HZNP - Get Report), where a total volume of 44,746 contracts has been traded thus far today, a contract volume which is representative of approximately 4.5 million underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 89.5% of HZNP's average daily trading volume over the past month, of 5.0 million shares. Particularly high volume was seen for the $25 strike call option expiring January 20, 2017, with 38,413 contracts trading so far today, representing approximately 3.8 million underlying shares of HZNP. Below is a chart showing HZNP's trailing twelve month trading history, with the $25 strike highlighted in orange:

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GoPro, Inc. ( GPRO) saw options trading volume of 33,071 contracts, representing approximately 3.3 million underlying shares or approximately 86.6% of GPRO's average daily trading volume over the past month, of 3.8 million shares. Particularly high volume was seen for the $9 strike call option expiring December 23, 2016, with 3,903 contracts trading so far today, representing approximately 390,300 underlying shares of GPRO. Below is a chart showing GPRO's trailing twelve month trading history, with the $9 strike highlighted in orange:

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And TrueCar Inc ( TRUE) saw options trading volume of 5,204 contracts, representing approximately 520,400 underlying shares or approximately 80.3% of TRUE's average daily trading volume over the past month, of 647,935 shares. Particularly high volume was seen for the $12.50 strike call option expiring April 21, 2017, with 5,014 contracts trading so far today, representing approximately 501,400 underlying shares of TRUE. Below is a chart showing TRUE's trailing twelve month trading history, with the $12.50 strike highlighted in orange:

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