Stock funds regained popularity among investors who had preferred bond funds during the stock slump, with a stock index fund run by the Vanguard Group becoming last month’s best-selling U.S. mutual fund, Reuters reports.

The Vanguard Total Stock Market Index fund took in an estimated $1.6 billion in net new money in March amid a rebounding stock market, according to Boston research firm Financial Research Corp. The $25.7 billion Vanguard fund, one of the largest U.S. stock funds, tracks a gauge of the entire U.S. stock market.

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