High-yield bond funds posted $2.1 billion in net withdrawals during the week ended March 8.
The latest regulatory actions highlight concerns over the potential for trading abuses affecting ETFs.
The ETF's assets have fallen to $2 billion from $5.2 billion at its 2013 peak.
Riskier U.S.-based funds invested in stocks and bonds seen as protecting against inflation were the winners.
The SPDR S&P 500 ETF attracted $8.2 billion on Wednesday, the largest inflows since December 2014.
The price war indicates brokers want to win over clients to digital investment advice and other fee-based offerings.
Foreign stock funds have absorbed more cash than their domestic counterparts in past weeks.
Investors are increasingly buying relatively cheap funds that mimic benchmarks.
The milestone came after a dramatic shift in markets since the U.S. presidential election.
Has there been a post-election flight to safety in bonds and money markets?
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