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There Are Now More Indexes Than Stocks

This chart shows how on Earth that happened.

The number of market indexes now exceeds the number of U.S. stocks. Traditional ones such as the S&P 500 are collections of securities weighted by market value, and index funds mimic them as a low-cost way to deliver the market’s performance. Many new indexes are different: They include stocks based on custom criteria, such as having low volatility or high dividends.*

Demand. Many new benchmarks essentially repackage active investment strategies into indexes, says Eric Balchunas, senior exchange-traded fund analyst at Bloomberg Intelligence. They can then be tracked by so-called smart-beta ETFs, which fund companies are rolling out rapidly.