Exchange-traded fund flows topped $17.3 billion in March with the fixed income category leading the way to the tune of $5 billion, increasing its year-to-date net flows to $7.1 billion, according to State Street Global Advisor’s latest ETF Snapshot.

Emerging market ETFs had the most significant outflows last month, losing $5.7 billion.

The top three ETF managers in the U.S. were BlackRock, State Street and Vanguard, accounting for some 83% of the ETF market. The top three ETFs in terms of dollar volume traded for the month were the SPDR S&P 500 (SPY), iShares Russell 2000 (IWM) and the iShares MSCI Emerging Markets (EEM).