NEW YORK (AP) — Total U.S. money market mutual fund assets rose $4.87 billion to $2.639 trillion for the week that ended Wednesday, the Investment Company Institute said Thursday.

Assets of the nation's retail money market mutual funds rose $5.73 billion to $942 billion, the Washington-based mutual fund trade group said. Assets of taxable money market funds in the retail category rose $3.86 billion to $748.84 billion. Tax-exempt retail fund assets rose $1.88 billion to $193.16 billion.

Meanwhile, assets of institutional money market funds fell $860 million to $1.697 trillion. Among institutional funds, taxable money market fund assets fell $2.2 billion to $1.600 trillion; assets of tax-exempt funds rose $1.34 billion to $97.68 billion.

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