The Vanguard S&P 500 ETF (NYSEMKT: VOO) mirrors the S&P 500, which is the stock market's most-followed index. Tracking around 500 of the largest American companies on the market, the S&P 500 is a ...

Vanguard pioneered the concept of index fund investing, and currently has a whopping $11 trillion in assets under management.

U.S. stocks by a wide margin since 2010. Yet, there are some fantastic companies to invest in outside of the United States.