After the close of trading on December 9th, General Growth Properties Inc (NYSE:GGP) will join the S&P 500 Index. General Growth Properties is a real estate investment trust that owns and operations shopping malls in the U.S. and Brazil. General Growth Properties will take Molex Incorporated’s (NASDAQ:MOLX) position in the S&P 500 Index. The reason for the change is privately held Koch Industries is acquiring Molex. Koch Industries’ acquisition of Molex is expected to be complete on December 9th.