Assets invested in money market mutual funds climbed 0.2%, to $655.3 billion, in the week ended May 3, the Investment Company Institute reported.

The gain was concentrated in funds for retail investors. These portfolios closed the week with $464.3 billion, up $1.8 billion.

That includes $370.7 billion in taxable retail funds, up $1.5 billion, and $93.6 billion in tax-exempt funds, a $307 million rise.

The picture was mixed on the institutional side. Total assets of these funds declined $404 million, to $191 billion.

But while taxable funds shed $885.2 million, to close the week at $168.1 billion, tax-exempt funds attracted $481.2 million, ending with $22.9 billion of assets.

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