index fund

American  

noun

1. a fund, as a mutual fund or pension fund, with a portfolio that contains many of the securities listed in a major stock index in order to match the performance of the stock market generally.

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Etymology

Origin of index fund

First recorded in 1975–80

Example Sentences

For index fund investors, the long-term implications of the SpaceX initial public offering on June 11 will be greater than its immediate impact.

From Barron's • Jun. 5, 2026

The iShares index fund, which began trading in 2000, also charges 0.03%.

From Barron's • Jun. 3, 2026

Owning an index fund does not eliminate active decision-making.

From MarketWatch • Jun. 2, 2026

He assumed you bought and held a total stock-market index fund for 30-year periods starting in 1926 and paid federal taxes at the rates that applied in each of those years.

From The Wall Street Journal • May 29, 2026

You can build the 90-10 portfolio yourself simply by buying an index fund and a money-market fund, and rebalancing at the start of each year if stocks have gone up or down.

From The Wall Street Journal • May 21, 2026