Total assets in money market mutual funds fell by $15.3 billion to $3.543 trillion during the week ending Sept. 9, largely driven by institutional accounts, the Investment Company Institute said.

Retail money market fund assets fell $1.59 billion to $1.161 trillion. Among retail funds, taxable assets fell $940 million to $907.53 billion and tax-exempt assets fell $650 million to $253.46 billion.

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