Index Fund

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DEFINITION of 'Index Fund'

A type of mutual fund with a portfolio constructed to match or track the components of a market index, such as the Standard & Poor's 500 Index (S&P 500). An index mutual fund is said to provide broad market exposure, low operating expenses and low portfolio turnover.

INVESTOPEDIA EXPLAINS 'Index Fund'

"Indexing" is a passive form of fund management that has been successful in outperforming most actively managed mutual funds. While the most popular index funds track the S&P 500, a number of other indexes, including the Russell 2000 (small companies), the DJ Wilshire 5000 (total stock market), the MSCI EAFE (foreign stocks in Europe, Australasia, Far East) and the Barclays Capital Aggregate Bond Index (total bond market) are widely used for index funds.

Investing in an index fund is a form of passive investing. The primary advantage to such a strategy is the lower management expense ratio on an index fund. Also, a majority of mutual funds fail to beat broad indexes, such as the S&P 500.

Want to know more about index funds? Read Index Investing: Index Funds

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