Assets invested in the nation's 325 institutional money market mutual funds increased 1.2%, to $335.39 billion, in the week ended July 23, the Investment Company Institute reported.

Assets in retail money market mutual funds increased 0.5%, to $656.35 billion, during the same period, with assets in taxable money market mutual funds up by $3.23 billion. Assets in tax-exempt funds dropped by $117 million.

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