Key Points The S&P 500 is a terrific index of America's biggest companies. However, it has become heavily concentrated in just a few companies. There's an intriguing alternative for those who want to invest in the S&P 500. 10 stocks we like better than Vanguard S&P 500 ETF › If you're investing in the Vanguard S&P 500 ETF (NYSEMKT: VOO) -- or the SPDR S&P 500 ETF (NYSEMKT: SPY) -- that's great. You're now a partial owner of 500 of America's biggest companies. Even Warren Buffett has recommended low-cost S&P 500 index funds for most of us small investors. In his 2016 letter to shareholders, he noted, "Over the years, I've often been asked for investment advice ... My regular recommendation has been a low-cost S&P 500 index fund.
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