Assets invested in money market mutual funds edged up 0.048%, to $1.0464 trillion, in the week ended Oct. 22, the Investment Company Institute reported.

The increase was concentrated in funds for retail investors. Balances of these portfolios rose 1%, to $687.05 billion. That includes $564.76 billion in taxable funds, up $1.07 billion, and $122.29 billion in tax-exempt funds, down $206 million.

On the institutional side, assets dipped 1.02%, to $359.31 billion. Taxable funds held $322.8 billion of the total, up $3 million. Tax-exempt funds shed $367 million to close the week at $36.51 billion.

The institute, a Washington-based 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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