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The Vanguard S&P Small-Cap 600 Index Fund ETF (VIOO) is a popular exchange-traded fund that enables U.S. investors to gain direct access to small-cap stocks in the United States. While it is less well-followed, at least relative to more popular funds such as SPDR S&P 500 Trust ETF (SPY), VIOO nonetheless had total net assets of $3.4 billion as of April 30, 2021. Besides SPY, another S&P 500 index tracker is the Vanguard S&P 500 ETF (VOO), also offered…

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