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.

Yahoo (YHOO): An investor sold more than 45,000 July 16 calls and rolled the position to the July 18 strike, collecting a credit of $0.34. YHOO rose 1.82 percent to $15.37.

Sara Lee (SLE): An investor bought more than 17,000 January 22 calls, but volume was below open interest in the strike. SLE fell 0.27 percent to $20.48.

Bank of America (BAC): More than 14,000 January 2014 10 calls were bought, mostly for $1, as investors look for upside in the shares. The June 7 puts were also bought. BAC rose 7.82 percent to $7.65.

Morgan Stanley (MS): An investor bought 40,000 June 16 puts for $2.56 and sold an equal number of July 16 puts for $2.78. It appears they rolled an existing short position one month into the future, gaining more time for the stock to rebound. They also collected a credit of $0.22. MS rose 5.83 percent to $13.61.

Facebook (FB): Almost 7,000 June 27 puts were bought for $0.95 to $1.20 as investors position for downside in the stock. FB rose 0.97 percent to $26.12.

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