Assets invested in money market mutual funds rose 0.40%, to $1.2577 trillion, in the week that ended Aug. 26, the Investment Company Institute reported.

The gains were concentrated in portfolios for retail investors, which rose 0.54%, to $766.37 billion. That includes $627.13 billion in taxable funds, up $4.06 billion, and $51.4 million in tax-exempt funds, up $139 million.

On the institutional side assets rose 0.19%, to $491.30 billion. Taxable assets grew by $1.26 billion, to $445.67 billion, while tax-exempt assets fell $333 million, to $45.63 billion.

The institute, a trade group for mutual fund companies, bases its report on a weekly survey of more than 1,000 money market funds.

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