Assets invested in money market mutual funds jumped 0.9%, to $940.14 billion, in the week that ended Jan. 22, the Investment Company Institute reported.

Gains were concentrated in portfolios for institutional investors. Assets in these funds climbed 2.9%, to $316.67 billion, during the week. That includes $285.05 billion in taxable funds, up 3.1%, and $31.62 billion in tax-exempt funds, up 0.3%.

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