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• Top 10 list of unusual option activity
• Update: Top unusual option activity

• CDNS 100% Rate It
• KND 100% Rate It
• MILL 100% Rate It
• NXPI 89% Rate It
• VNQ 0% Rate It

Nearing the halfway mark in today's session, here are the top 10 names showing unusual option activity on tradeMONSTER's LiveAction data system.

Kindred Healthcare (KND): Option volume 2,200 percent above average. A position in 2,000 August 20 puts was rolled to the August 15 puts and doubled in size. KND rose 2.14 percent to $18.85.

Cadence Design Systems (CDNS): Option volume 1,566 percent above average. Investors sold the August 10 and August 11 puts against open interest. CDNS rose 6.27 percent to $10.

Miller Energy Resources (MILL): Option volume 1,033 percent above average. Investors bought about 2,700 August 2.50 puts for $0.20 to $0.50. MILL fell 7.59 percent to $4.99.

Vanguard REIT (VNQ): Option volume 764 percent above average. A block of 1,885 September 65 calls was sold for $0.45. VNQ fell 0.44 percent to $60.76.

PHLX Swiss Franc (XDS): Option volume 744 percent above average. Investors bought and sold December 121 puts in the thinly traded fund. XDS rose 1.85 percent to $127.08.

Rounding out the rest of the top 10 are:

• NXP Semiconductor (NXPI): Option volume 728 percent above average.
• True Religion (TRLG): Option volume 679 percent above average.
• Dollar General (DG): Option volume 661 percent above average.
• Cablevision Systems (CVC): Option volume 620 percent above average.
• Sourcefire (FIRE): Option volume 531 percent above average.

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