Assets of money market mutual funds declined 0.236%, to $1.2735 trillion, in the week ended Sept. 30, the Investment Company Institute reported.

The decline was concentrated in funds for retail investors; their balances fell 0.386%, to $774.24 billion. That included $637.84 billion of taxable funds, down $2.02 billion, and $136.40 billion of tax-exempt funds, down $971 million.

On the institutional side, assets fell a slim 0.004%, to $499.23 billion. Taxable funds shed $697 million to close the week at $453.99 billion. Tax-exempt fund balances rose $682 million, to $45.24 billion.

The institute, a Washington-based trade group for mutual fund companies, surveys more than 1,000 money market funds each week.

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