Long-term inflows of U.S. mutual funds totaled $13.5 billion in June, representing a 1.9 percent organic growth rate, according to a new report.

Strategic Insight of New York, published this finding in the June release of its Simfund/MF data report, which provides a detailed view into mutual fund asset, flow, and performance trends. The data reflects only U.S. mutual funds, which in some cases represent only a minority of a company's total assets under management. Organic growth and attrition rates are (unless otherwise noted) annualized.

The report finds that long-term product flows remained “muted” in June. But ETFs saw a substantial rebound in flows for the month: Inflows totaled about $13 billion.