Assets in money market mutual funds jumped 0.9%, to $861.54 billion, in the week ended Sept. 11, the Investment Company Institute reported.

Funds for retail investors held $593.43 billion of the total, up $2.97 billion. That includes $483.27 billion in taxable portfolios, a gain of $2.55 billion, and $110.16 billion in tax-exempt portfolios, up $419.3 million.

On the institutional side, assets rose $4.83 billion, to $268.11 billion. Taxable funds held $238.6 billion, a $5.07 billion increase. Tax- exempt fund balances fell $235.4 million to $29.51 billion.

The institute, a Washington-based trade group for mutual fund companies, bases its findings on a weekly survey of nearly 1,000 money market funds.

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