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Largest option buying in equities so far

David Russell (david.russell@optionmonster.com)

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.

Talisman Energy (TLM): A block of 20,000 July 14 calls was bought for $0.65 and the same number of July 11 puts was sold for $0.60. The resulting position is similar to owning shares in the oil company, making money to the upside and losing to the downside. TLM fell 1.44 percent to $12.36.

Facebook (FB): A block of 8,000 May 25 puts were bought for $1.23 as an investor positions for downside in the social-networking stock. FB fell 0.88 percent to $27.01.

Theravance (THRX): About 5,200 March 15 puts were bought for $0.60 as traders brace for a drop in the drug developer. THRX fell 2.07 percent to $19.87.

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