Successfully Fired 3-D Printed Gun Has Airwaves Buzzing and Stocks Surging (DDD) (XONE) (SSYS)

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S&P Changes: Macerich (MAC) to S&P 500, 3D Systems (DDD) to S&P MidCap 400, CoreSite Realty (COR) to S&P SmallCap 600

May 6, 2013 6:45 AM EDT

After the close Friday it was announced that S&P MidCap 400 constituent The Macerich Co. (NYSE: MAC) will replace Coventry Health Care Inc. (NYSE: CVH) in the S&P 500, S&P SmallCap 600 constituent 3D Systems Corp. (NYSE:... More