Nearing the halfway mark in today's session, here are the individual equity names with unusual option activity on optionMONSTER's ActionTracker data system.
Rio Tinto (RIO): Traders bought 3,700 April 30 puts, mostly for $4.30, bracing against downside in the mining stock. RIO rose 1.24 percent to $27.87
SanDisk (SNDK): A trader sold 1,000 January 70 calls for $5.95 and bought 2,000 January 80 calls for $0.20. Volume was under open interest at both strikes, which suggests a ratio spread was unwound. SNDK fell 0.72 percent to $74.29.
Discover Financial (DFS): A block of 3,000 January 57.50 calls were bought for $0.25 as investors positioned for upside in the share price. DFS fell 1.82 percent to $52.90.
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