Dave Nadig and Oliver Ludwig for Index Universe report that investors fled riskier assets and piled into safer havens such as gold and Treasury bond funds. The single-biggest winning fund was the State Street Global Advisors SPDR Gold Trust (NYSEArca: GLD), which added $4.22 billion in assets, bringing the total to $49.21 billion, as fiscal problems in Europe escalated.

Another winner last month was PIMCO Enhanced Short Maturity Strategy Fund (NYSEArca: MINT), which gathered $596.4 million in assets.

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Tisha Guerrero contributed to this article.