News Summary (AET, AZO, MMM)

Shares of Aetna Inc AET gained about 0.2% after the company announced its plans to purchase Medicity for $500 million. Aetna said, “Medicity offers a broad range of products and services that enable health systems, hospitals, physician practices and health information exchanges to securely access and exchange health care information." Shares of AutoZone Inc AZO gained about 2.6% after the company reported 20% y/y rise in its Q1 earnings. The company's earnings came in at $3.77 per share on revenue of $1.79 billion. However, analysts were expecting earnings at $3.42 per share, on revenue of $1.72 billion. Shares of 3M Co MMM lost about 1% after the company projects its 2011 earnings of $6.17 per share to $6.37 per share, excluding pension expenses. However, analysts were expecting 2011 earnings at $6.24 per share. Read more from Benzinga's Markets.