The Vanguard S&P 500 ETF (VOO) tracks the S&P 500 index. This index is seen as a measure of how the U.S. stock market is doing. Over time, the S&P 500 has given returns of about 9% to 10% each year. For example,

The oldest exchange-traded fund listed in the U.S. has just been surpassed in assets under management by a Vanguard ETF that more cheaply tracks the S&P 500 index.

Vanguard has unseated State Street for the title of the world’s biggest exchange-traded fund, ushering in a new world order for the $11 trillion industry.