Assets of money market mutual funds rose 0.11%, to $1.030 trillion, in the week that ended Sept. 3, the Investment Company Institute reported.

The increase was concentrated in funds for institutional investors, which closed the week with $350.05 billion of assets, up 0.71%. That includes $313.43 billion in taxable portfolios, up $1.79 billion, and $36.62 billion in tax-exempt portfolios, up $682 million.

On the retail side, assets declined 0.2% to $680.18 billion. Assets of taxable portfolios fell to $558.03 billion, down $1.89 billion. Tax-exempt portfolios rose to $122.15 billion, a rise of $539 million.

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

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