ETFs had their strongest week of the year so far last week, with $31.6bn of investment into ETFs globally.
This was significantly up on the previous high for the year of $26.5bn during April.
The growth was led by U.S. equity funds, as major market benchmarks hit new highs, according to EPFR Global.
All four of the major U.S. indices reached new highs over the past week, despite tech sector sell-offs.
EPFR said that the SPDR S&P 500 ETF took in the largest amount in the week to Wednesday, followed by the iShares Core S&P 500 ETF and iShares Russell 2000 ETF.
The firm reported that global equity funds excluding the US taking in money for every week this year for a year-to-date total of $48.54bn. That compares with global equity funds, which include US exposure, having cumulative inflows of $17.13bn so far this year.