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• AMRN 69% Rate It
• DLPH 100% Rate It
• FB 66% Rate It
• GE 89% Rate It
• HCA 60% Rate It

Nearing the halfway mark in today's session, here are the individual equity names with the most call and put buying on optionMONSTER's ActionTracker data system.

Delphi Automotive (DLPH): Large trades occurred in the February 35 calls and the November 32.50 calls. Volume was below open interest in each, suggesting that a previous diagonal spread was closed. DLPH rose 0.38 percent to $31.66.

Amarin (AMRN): Volume surged in the March 8 puts, the March 16 calls and the March 20 calls as an investor implemented a complex bullish strategy on the Irish drug company. AMRN drops 4.70 percent to $11.77.

HCA (HCA): A block of 10,000 October 31 puts was sold for $0.25 but volume was below open interest at the strike. HCA falls 0.66 percent to $33.04.

General Electric (GE): Investors purchased more than 11,000 October 22 puts for $0.14 and $0.15, positioning for downside in coming weeks. GE climbs 0.48 percent to $22.90.

Facebook (FB): More than 12,000 October 19 puts were bought for $0.10 to $0.15 as investors look for the social-networking stock to decline. FB falls 0.49 percent to $22.16.

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