Assets in exchange-traded funds grew 8.6% in March, the Investment Company Institute said.
The asset total in exchange-traded funds rose to $100.83 billion, the institute said on Wednesday. Equity index funds in this category grew 8.9%, to $97.16 billion, and bond index funds shrank 4.7%, to $3.67 billion.
Assets of domestic equity exchange-traded funds rose by $8.2 billion, and international equity fund assets fell by $42 million.
An exchange-traded fund is an investment vehicle with shares that trade intraday on stock exchanges at market-determined prices. Investors may buy or sell the shares through a broker just as they would the shares of any publicly traded company.