Summary: June 13 (Bloomberg) -- Bloomberg data shows $2.7 billion has flowed out of the SPDR S&P 500 ETF Trust this year, as $1.9 billion has flowed into the Vanguard S&P 500 ETF. Bloomberg analyst Eric Balchunas explains why the Vanguard fund has been slightly outperforming the SPDR ETF. Bloomberg Radio's Catherine Cowdery reports on Exchange Traded Funds. (Source: Bloomberg)
