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What Index Funds Are the Best to Invest in? Best S&P 500 Index Funds

By Cornell Rachel
Oct 9, 2025
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This article is about what index funds are the best to invest in. Index funds are a popular and low-cost way to invest in the stock market.

What Index Funds Are the Best to Invest in?

Index funds are passive investments that track a predefined basket of stocks, such as the S&P 500. the Nasdaq 100. or the Russell 2000. Index funds aim to replicate the performance of their underlying indexes, minus expenses. By investing in index funds, you can gain exposure to a broad and diversified range of companies without having to pick individual stocks or pay high fees to active managers.

But not all index funds are created equal. Some index funds do a better job of closely tracking their indexes, minimizing costs, and following sensible rules-based indexes than others.

Best S&P 500 Index Funds

The S&P 500 is one of the most widely followed stock market indexes in the world. It consists of 500 large-cap U.S. companies that represent about 80% of the total market capitalization of the U.S. stock market. The S&P 500 is often used as a benchmark for the performance of the U.S. stock market as a whole.

Some of the best S&P 500 index funds to invest in are:

- Fidelity ZERO Large Cap Index (FNILX): This mutual fund has no expense ratio, meaning it charges no fees to investors. It tracks the Fidelity U.S. Large Cap Index, which is very similar to the S&P 500. It has a low tracking error of 0.01% and a five-year annualized return of 17.67% as of September 30. 2023.

- Vanguard S&P 500 ETF (VOO): This exchange-traded fund (ETF) has a very low expense ratio of 0.03%, meaning it charges $3 for every $10.000 invested annually. It tracks the S&P 500 index with a tracking error of 0.02% and a five-year annualized return of 17.66% as of September 30. 2023.

- Schwab S&P 500 Index Fund (SWPPX): This mutual fund has a low expense ratio of 0.02%, meaning it charges $2 for every $10.000 invested annually. It tracks the S&P 500 index with a tracking error of 0.03% and a five-year annualized return of 17.64% as of September 30. 2023.

Bottom Line

In this article, we have discussed what index funds are the best to invest in. Determining the best index funds to invest in depends on your specific investment goals, risk tolerance, and asset allocation preferences.

Disclaimer: The information on this page may have been obtained from third parties and does not necessarily reflect the views or opinions of BitKan. This content is provided for general informational purposes only, without any representation or warranty of any kind, nor shall it be construed as financial or investment advice. BitKan shall not be liable for any errors or omissions, or for any outcomes resulting from the use of this information. Investments in digital assets can be risky. Please carefully evaluate the risks of a product and your risk tolerance based on your own financial circumstances. Products mentioned in this article may not be available in your region.

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