Market Vectors Gulf States Index ETF (NYSEArca: MES)
April gain: 6.1%
Comment: Continued strength in Qatar and United Arab Emirates stocks continues to lift MES. Those countries will soon join the MSCI Emerging Markets Index, but that transition will not alter the make up of MES or the WisdomTree Middle East Dividend Fund (NasdaqGM: GULF), which also turned in a solid April performance.