Exchange-traded funds continued to take in money in August, but inflows slowed to $5.5 billion, down from $13.5 billion the month before.

Barclays realized the biggest share of the inflows ($2.2 billion), with Vanguard a close second ($2.1 billion). Invesco/PowerShares and State Street Global Advisors both took in $1 billion apiece.

The best-selling ETF in August was the iShares S&P 500 Fund, taking in about $1 billion, followed by iShares Russell 2000 ($700 million), iShares Barclays TIPS ($600 million), Vanguard REIT ($500 million) and SPDR E&P Energy ($400 million).

The biggest outflow was $1.6 billion from the iShares FTSE/Xinhua China 25 Fund, followed by $1 billion in redemptions from the iShares MSCI Emerging Markets Fund.

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