Assets invested in money market mutual funds climbed 1.0%, to $952.54 billion, in the week that ended May 7, the Investment Company Institute reported.

The inflows, while broad-based, were strongest in portfolios for institutional investors. These funds closed the week with $315.85 billion of assets, up 2.3%. That includes $282.95 billion in taxable portfolios, up 1.7%, and $32.90 billion in tax-exempt portfolios, up 7.1%.

On the retail side assets climbed 0.4%, to $636.68 billion. That includes $524.28 billion in taxable portfolios, a 0.2% rise, and $112.41 billion in tax-exempt portfolios, a 1.1% gain.

The institute, a Washington-based trade group for mutual fund companies, bases its report on a weekly survey of nearly 1,000 money market funds.

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