Total assets in the nation's exchange-traded funds in March reached $228.7 billion, up 2.2% from $223.86 billion in February, according to the Investment Company Institute.

While assets of almost all ETFs went up, assets of equity index ETFs surged by $3.67 billion, to $217.4 billion in March. Bond index ETF assets increased by $1.19 billion, to $11.32 billion for the month.

Subscribe Now

Access to premium content including in-depth coverage of mutual funds, hedge funds, 401(K)s, 529 plans, and more.

3-Week Free Trial

Insight and analysis into the management, marketing, operations and technology of the asset management industry.