Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in Iridium Communications Inc (IRDM - Get Report), where a total volume of 9,842 contracts has been traded thus far today, a contract volume which is representative of approximately 984,200 underlying shares (given that every 1 contract represents 100 underlying shares). That number works out to 171.5% of IRDM's average daily trading volume over the past month, of 573,955 shares. Particularly high volume was seen for the $7.50 strike put option expiring January 20, 2017, with 9,573 contracts trading so far today, representing approximately 957,300 underlying shares of IRDM. Below is a chart showing IRDM's trailing twelve month trading history, with the $7.50 strike highlighted in orange:

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

ClubCorp Holdings Inc ( MYCC) options are showing a volume of 9,817 contracts thus far today. That number of contracts represents approximately 981,700 underlying shares, working out to a sizeable 146.2% of MYCC's average daily trading volume over the past month, of 671,360 shares. Particularly high volume was seen for the $14 strike call option expiring March 17, 2017, with 9,503 contracts trading so far today, representing approximately 950,300 underlying shares of MYCC. Below is a chart showing MYCC's trailing twelve month trading history, with the $14 strike highlighted in orange:

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And Bellicum Pharmaceuticals Inc ( BLCM) options are showing a volume of 3,393 contracts thus far today. That number of contracts represents approximately 339,300 underlying shares, working out to a sizeable 93.1% of BLCM's average daily trading volume over the past month, of 364,545 shares. Especially high volume was seen for the $20 strike call option expiring December 16, 2016, with 1,682 contracts trading so far today, representing approximately 168,200 underlying shares of BLCM. Below is a chart showing BLCM's trailing twelve month trading history, with the $20 strike highlighted in orange:

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For the various different available expirations for IRDM options, MYCC options, or BLCM options, visit StockOptionsChannel.com.