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The largest exchange-traded fund (ETF) traded in the United States, as of August 16, 2025, was the Vanguard S&P 500 ETF, holding assets under management (AUM) of approximately *** billion U.S. dollars. The Vanguard S&P 500 ETF was one of the largest providers of ETFs in the United States.

What are ETFs?

An ETF is a basket of shares or other financial assets which generally tracks an underlying index. They are similar to mutual funds, with the fundamental difference that ETFs are listed on stock exchanges, with ETF shares being traded just like regular stock.

Are ETFs a good investment?

As ETFs hold a basket of stocks and other financial assets, they are diverse and are considered low-risk investments. This makes them popular among risk-averse investors, beginners, or among those who plan to invest more long-term. The popularity of ETFs has increased dramatically in the last decade, which can be seen by the steady increase in the number of ETFs worldwide.