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.
Citigroup (C): An investor bought 13,000 March 44 calls for $0.77, looking for the financial giant to keep climbing. C fell 0.74 percent to $38.96.
Facebook (FB): Investors sold more than 21,000 December 25.50 calls for $0.10 to $0.30, betting that the social-networking stock is near a short-term high. FB is down 2.53 percent to $25.39.
Phillips 66 (PSX): More than 11,000 January 50 calls were purchased, mostly for $2.30, looking for upside in the refinery stock. PSX fell 0.48 percent to $51.31.
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