Largest option buying in equities so far

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.

Walgreen (WAG): Some 24,242 January 2015 50 calls was purchased for $6.05 against open interest of 7,310 contracts. A large block of shares was sold less than two minutes later, indicating the use of a so-called delta-neutral trade that profits from volatility rather than a rally in the share price. WAG rose 1.27 percent to $50.89.

Exxon Mobil (XOM): Some 13,500 September 90 puts were bought, mostly for $1.18, as investors brace for further downside in the energy giant. XOM fell 2.40 percent to $91.50.

Wells Fargo (WFC): A block of 6,048 August 39 puts were bought for $0.04 and an equal number of August 46 calls were sold for $0.07. The trader collected $0.03 and is now protected against a near-term selloff in the San Francisco-based lender. WFC rose 1.75 percent to $44.26.

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