Largest option buying in equities so far

optionMONSTER

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.

Activision Blizzard (ATVI): An investor bought 27,592 September 16 calls for $0.82 and sold 55,184 September 17 calls for $0.36. Known as a ratio spread, the trade cost almost nothing to open and will generate huge leverage on a move to $17, with upside risk above that level. ATVI rose 2.16 percent to $15.60.

Micron Technology (MU): Some 21,000 January 2015 15 calls were bought, mostly for $2.55 and $2.60, as investors continue to position for upside in the memory-chip maker. MU rose 1.18 percent to $13.75.

Citigroup (C): Almost 13,000 July 50 calls were bought for $2.25 to $2.40 as investors look for the financial giant to keep climbing. C rose 1.37 percent to $52.50.

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