Walgreen Co. shares fell 0.6% in early trade Tuesday, after Mizuho Securities downgraded the stock to neutral from buy. The lowered rating reflects limited upside to adjusted per-share earnings, sub-par organic growth in the company's two main businesses, high execution risk around the integration of Alliance Boots due to management turnover, increased international exposure and currency risk and valuation, analysts wrote in a note. Mizuho is also cutting its price target on the stock to $72 from $83. Shares have gained 17% in the year so far, outperforming the S&P 500's 12% gain.
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