Georgia's top stock performers for the first half of 2015

Booming U.S. stock markets have propelled a number of Georgia stocks to lofty gains during the first half of 2015. Among Georgia's 50 largest public companies (ranked by revenues), 19 have enjoyed share price gains of at least 10 percent since Jan. 2, and seven have soared 25 percent or more. (Check out the full chart below.) The top performer is EarthLink Holdings Corp. (Nasdaq: ELNK), a provider of managed network, internet security and cloud services. The company's shares spent the first few…