Assets of money market mutual funds dipped 0.2%, to $860.9 billion in the week ended Sept. 18, the Investment Company Institute reported.

The outflow was concentrated in funds for retail investors, which closed the week with assets of $587.36 billion, down $3.91 billion. That includes $478.4 billion in taxable funds, off $2.7 billion, and $108.95 billion in tax-exempt funds, down $1.2 billion.

On the institutional side, assets grew $2.16 billion, to $273.54 billion.

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