Walgreen (WAG) volatility low; shares rally 14% on new pharmacy network agreement with Express Scripts

Walgreen (NYSE: WAG) is recently up $3.93 to $34.90 in the premarket following a new pharmacy network agreement with Express Scripts (ESRX). Overall option implied volatility of 23 is below its 26-week average of 27 according to Track Data, suggesting decreasing price movement.

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