WASHINGTON — Assets of exchange-traded funds grew 2.6% in March, to $66.03 billion, according to the Investment Company Institute, the mutual fund industry’s main trade organization.

A net $8.94 billion in new ETF shares were issued in March, up 178% from February. Gross issuance rose 99%, to $12.33 billion; redemptions increased 14%, to $3.40 billion.

An exchange-traded fund is an investment with shares that trade intraday on stock exchanges at market-determined prices.

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