Use the Kiplinger ETF 20 to build a solid core for your portfolio. Our list also includes funds to explore satellite strategies. Fly Me to the Moon is a love song, the Frank Sinatra version of which was actually played on the moon by Apollo 11 astronauts. But these days, it might as well be the anthem for investors in exchange-traded funds. Assets in ETFs are growing at an astronomical rate, closing in on $4 trillion in the U.S. That's still less than the $18 trillion that sits in U.S. mutual funds. But it's clear that investors are now choosing ETFs over mutual funds. The ETF share of total assets at investment firms has grown to nearly 16% from 8% at the start of the decade, while mutual funds have lost market share.
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