Investors are increasingly pouring into the largest exchange-traded funds that focus on U.S. companies less affected by market swings. The iShares Edge MSCI Minimum Volatility USA and PowerShares S&P 500 Low Volatility Portfolio ETFs surpassed $20 billion in combined assets this month for the first time. Their assets rose $7.2 billion for the year through yesterday, which exceeded the total for all of 2014 and 2015 combined.

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