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• COL 0% Rate It
• DMND 80% Rate It
• DNN 67% Rate It
• MWE 100% Rate It
• SVNT 100% 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.

Rockwell Collins (COL): Option volume 1,718 percent above average. Investors bought about 2,900 October 60 calls and about 1,900 October 65s. COL rose 5.96 percent to $55.25.

Denison Mines (DNN): Option volume 1,617 percent above average. A short position in the October 2 puts was rolled to the January 2 contracts. DNN fell 1.71 percent to $1.44.

MarkWest Energy Partners (MWE): Option volume 1,060 percent above average. More than 3,000 September 43 puts were sold for $0.01 to $0.03. The September 48 calls were also bought against existing open interest. MWE fell 3.04 percent to $46.59.

Savient Pharmaceuticals (SVNT): Option volume 914 percent above average. The September 4 puts and December 5 calls traded heavily against existing open interest. SVNT fell 1.22 percent to $4.06.

Goodrich (GR): Option volume 804 percent above average. Investors sold the October 90 puts and bought the October 95 calls. GR rose 3.31 percent to $89.34.

Rounding out the rest of the top 10 are:

• Diamond Foods (DMND): Option volume 762 percent above average.
• Oneok (OKE): Option volume 746 percent above average.
• GMX Resources (GMXR): Option volume 608 percent above average.
• Tyco International (TYC): Option volume 588 percent above average.
• Williams Partners (WPZ): Option volume 557 percent above average.

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