Reversing a trend of outflows, tax-exempt money market funds raked in $3.33 billion to end the week of May 9 with $309.95 billion in total net assets, according to the Money Fund Report, a service of

It marked the single largest inflow activity so far this year, and was the first time the funds gained cash since picking up a modest $137.8 million in the week ended March 21, when total net assets finished at $322.20 billion.

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