Introduction

Disclaimer: This article is for informational purposes only and does not constitute financial advice. Always consult a qualified financial advisor before making investment decisions.

You have probably heard it a hundred times: just invest in an index fund and let it grow. But when you actually sit down to do it, the options feel overwhelming. Which fund? Which provider? Which ticker? What fees? And most importantly, will it actually work for you?

The Fidelity 500 Index Fund is one of the most discussed, most recommended, and most invested-in funds in the entire United States. It tracks the S&P 500, charges almost nothing in fees, and has delivered returns that beat the overwhelming majority of actively managed funds over virtually every meaningful time horizon. For millions of everyday investors, the Fidelity 500 Index Fund is not just a product. It is the foundation of their entire financial future.

In this guide, you will get a thorough, honest, and plain-language breakdown of everything you need to know about the Fidelity 500 Index Fund. You will learn what it is, how it works, what it costs, how it has performed historically, how it compares to competitors, who it is right for, and exactly how to get started. Let us get into it.

What Is the Fidelity 500 Index Fund?

The Fidelity 500 Index Fund, with the ticker symbol FXAIX, is a mutual fund managed by Fidelity Investments that tracks the performance of the S&P 500 Index. The S&P 500 is a market-capitalization-weighted index of 500 of the largest publicly traded companies in the United States. When you invest in this fund, you effectively own a small slice of all 500 of those companies.

Companies in the S&P 500 include household names like Apple, Microsoft, Amazon, Nvidia, Alphabet, and Berkshire Hathaway. These are not random picks. They represent roughly 80 percent of total US stock market capitalization. When the American economy grows, these companies tend to grow with it.

The Fidelity 500 Index Fund does not try to beat the market. It tries to match it. That is the entire point of index investing. Instead of paying a team of analysts to pick winning stocks, the fund simply holds all 500 stocks in proportion to their market weight. Costs stay low. Returns stay close to the market. And historically, that simple approach beats most active managers over time.

The fund launched in 1988 and has grown to become one of the largest mutual funds in the world by total assets under management. As of recent data, FXAIX manages well over $400 billion in assets, which tells you something important: a lot of serious investors trust this product.

Key Details, Fees, and Costs of FXAIX

One of the strongest arguments for the Fidelity 500 Index Fund is its cost structure. Fees eat returns. This is not an opinion. It is math. Every dollar you pay in management fees is a dollar that does not compound over the next 30 years. That is why the expense ratio of any fund you choose matters enormously.

FXAIX carries an expense ratio of just 0.015 percent annually. To put that in plain numbers: for every $10,000 you invest, you pay $1.50 per year in fees. That is essentially nothing. Fidelity cut this fee aggressively over the years as competition with Vanguard and Schwab intensified. The result is one of the cheapest investment products available to retail investors anywhere in the world.

Here are the key facts about the Fidelity 500 Index Fund at a glance:

• Ticker symbol: FXAIX
• Fund type: Mutual fund (not an ETF)
• Benchmark index: S&P 500
• Expense ratio: 0.015 percent per year
• Minimum investment: No minimum required
• Number of holdings: approximately 500 stocks
• Inception date: February 17, 1988
• Available through: Fidelity brokerage accounts and select employer retirement plans

The no minimum investment policy is particularly significant. When Fidelity dropped the minimum investment requirement, it opened the fund to anyone. You can start with $1 if you want to. That level of accessibility is rare among large mutual funds.

Historical Performance: What Has FXAIX Actually Returned?

Past performance does not guarantee future results. You will see that disclaimer on every investment product, and it is true. But historical performance still matters. It tells you how the fund has behaved across different market cycles, how closely it tracks its benchmark, and whether the fund’s structure holds up over long periods of time.

The Fidelity 500 Index Fund has historically delivered returns almost perfectly in line with the S&P 500 itself. The average annual return of the S&P 500 over the past 30 years has been approximately 10 to 11 percent before inflation. After inflation, the real return has averaged around 7 to 8 percent annually. These are not guaranteed numbers, but they are the historical baseline that index fund investors have built retirement plans around for decades.

To make this concrete: if you had invested $10,000 in the Fidelity 500 Index Fund at the start of 2010 and simply left it alone, you would have seen that investment grow to roughly $60,000 to $70,000 by the early 2020s, depending on exact timing and dividend reinvestment. That kind of compounding over time is why so many financial planners treat index funds as the default recommendation for long-term investors.

The fund did experience significant drops during major market downturns. In 2008, the S&P 500 lost approximately 37 percent of its value. In early 2020, it dropped sharply before recovering. These are real risks. If you cannot stomach watching your portfolio fall by 30 to 40 percent without selling, you need to understand that before investing in any equity index fund.

Tracking Error: How Closely Does FXAIX Follow the S&P 500?

Tracking error measures how closely a fund mirrors its benchmark index. A perfect index fund would have zero tracking error. In practice, some tiny gap always exists due to transaction costs, timing of rebalancing, and cash holdings. FXAIX has an extremely low tracking error. It is one of the most precise S&P 500 trackers available to retail investors, which is exactly what you want from a passive index fund.

Fidelity 500 Index Fund vs Vanguard and Schwab: How Does It Compare?

The Fidelity 500 Index Fund does not compete in a vacuum. Three names dominate the S&P 500 index fund market: Fidelity, Vanguard, and Schwab. Each offers a fund that tracks the same index. The differences between them are small but worth understanding before you decide where to put your money.

FXAIX vs VFIAX: Fidelity Against Vanguard

Vanguard’s S&P 500 index fund, VFIAX, is arguably the most famous index fund in the world. Vanguard pioneered index investing and has a near-religious following among long-term investors. VFIAX carries an expense ratio of 0.04 percent, which is higher than FXAIX’s 0.015 percent but still incredibly cheap in absolute terms. Vanguard requires a $3,000 minimum investment for VFIAX, which is a barrier the Fidelity 500 Index Fund does not have. For small or new investors, Fidelity wins on accessibility.

In terms of long-term returns, both funds track the same index and deliver nearly identical results. The difference in expense ratios is so small that it becomes meaningful only over very long time horizons with very large balances. The choice between them often comes down to which brokerage platform you prefer.

FXAIX vs SWPPX: Fidelity Against Schwab

Schwab’s S&P 500 Index Fund, SWPPX, has an expense ratio of 0.02 percent. It sits between FXAIX and VFIAX on cost, with no minimum investment. Like the Fidelity 500 Index Fund, it is designed for long-term passive investors who want simple, cheap S&P 500 exposure. If you already have a Schwab account, SWPPX is a fine choice. If you bank or invest with Fidelity, FXAIX is the obvious pick.

Who Should Invest in the Fidelity 500 Index Fund?

The Fidelity 500 Index Fund is not for everyone. No single investment is. But it is a genuinely excellent choice for a wide range of investors. Here is how to think about whether it belongs in your portfolio.

FXAIX is likely a strong fit if you:

• Have a long investment horizon of at least 10 years.
• Want broad exposure to the US stock market without picking individual stocks.
• Prefer a low-cost, low-maintenance investment that requires minimal ongoing attention.
• Are building a retirement portfolio inside a 401(k), IRA, or taxable brokerage account.
• Accept that your portfolio will decline during market downturns and can stay patient through volatility.

FXAIX may not be the right fit if you:

• Need your money within the next three to five years.
• Cannot tolerate significant short-term losses without panicking and selling.
• Want international diversification beyond US companies.
• Are looking for income-focused investments rather than growth-oriented ones.

Tax Efficiency: What Investors Often Overlook

The Fidelity 500 Index Fund has strong tax efficiency compared to actively managed funds. Because it does not frequently trade its holdings, it generates fewer taxable capital gain distributions. When a fund sells positions to rebalance or respond to redemptions, it can trigger capital gains that you owe taxes on even if you did not sell your own shares. Index funds minimize this problem.

That said, if you hold FXAIX in a taxable brokerage account rather than a tax-advantaged account like an IRA or 401(k), you will still owe taxes on dividends each year. The fund distributes dividends quarterly. For most long-term investors, holding FXAIX inside a Roth IRA or traditional IRA is the most tax-efficient approach because your gains and dividends grow without annual tax drag.

How to Start Investing in the Fidelity 500 Index Fund

Getting started with the Fidelity 500 Index Fund is straightforward. The process takes less than 30 minutes if you have your basic financial information available. Here is a simple step-by-step path to your first investment.

1. Open a Fidelity account. Go to Fidelity’s website and open either a taxable brokerage account, a Roth IRA, or a traditional IRA depending on your goals. The process is entirely online and takes roughly 10 minutes.
2. Fund your account. Link your bank account and transfer the amount you want to invest. There is no minimum, so you can start with as little as you are comfortable with.
3. Search for FXAIX. Use the fund ticker FXAIX in the search bar inside your Fidelity account to find the Fidelity 500 Index Fund.
4. Place your purchase order. Select the dollar amount you want to invest. Since this is a mutual fund and not an ETF, orders execute at the end of the trading day at the day’s closing net asset value.
5. Set up automatic contributions. If you want to build your investment over time, set up automatic monthly contributions. Consistency compounds. Even small regular contributions grow significantly over long periods.
6. Reinvest dividends automatically. Make sure your account settings reinvest dividends back into the fund rather than sitting in cash. Dividend reinvestment accelerates compounding meaningfully over a 20 to 30 year horizon.

Common Questions People Have Before Investing in FXAIX

Is the Fidelity 500 Index Fund Safe?

No equity investment is “safe” in the sense that it cannot lose value. The Fidelity 500 Index Fund will go down when the market goes down. It went down sharply in 2008, in early 2020, and during other significant market corrections. What makes it relatively low risk compared to individual stocks is diversification. You own 500 companies. If one company fails completely, it barely moves the needle on your overall return. Your risk is market risk, not single-company risk.

Should You Choose FXAIX or an S&P 500 ETF Like IVV or VOO?

FXAIX is a mutual fund. ETFs like Vanguard’s VOO and iShares’ IVV also track the S&P 500 but trade like stocks throughout the day. For long-term buy-and-hold investors, the difference is minor. Mutual funds execute once per day at net asset value. ETFs execute in real time at market price. If you are a long-term investor who is not trying to time the market, either structure works well. The key variable remains the expense ratio and which brokerage platform you prefer.

Final Verdict: Is the Fidelity 500 Index Fund Worth It?

The Fidelity 500 Index Fund deserves its reputation as one of the best investment products available to everyday investors. It is cheap, diversified, well-managed, and backed by one of the largest and most trusted financial institutions in the world. The core idea behind it, that matching the market beats most attempts to beat it, has been validated by decades of data.

Is it perfect? No investment is. You will watch the value of this fund fall during market downturns. You will not outperform the market with it, because it is the market. And if you need geographic diversity or exposure to small-cap stocks, you will want to pair it with other funds.

But as a core long-term holding for building wealth over decades, the Fidelity 500 Index Fund is as solid as it gets. The investors who make money with it are the ones who buy consistently, reinvest dividends, and resist the urge to sell when the market gets scary.

Are you already invested in the Fidelity 500 Index Fund, or are you still deciding? Share this article with someone who is just starting their investment journey. And if you have questions about where this fund fits in your overall financial plan, the comments section is a great place to start that conversation.

FAQs: Fidelity 500 Index Fund

1. What is the ticker symbol for the Fidelity 500 Index Fund?

The ticker symbol for the Fidelity 500 Index Fund is FXAIX. You can search for this ticker inside any Fidelity brokerage account to find and purchase the fund.

2. What is the expense ratio of FXAIX?

The Fidelity 500 Index Fund has an expense ratio of 0.015 percent per year. This means you pay just $1.50 annually for every $10,000 you have invested. It is one of the lowest expense ratios available on any mutual fund in the market.

3. What is the minimum investment for the Fidelity 500 Index Fund?

There is no minimum investment requirement for FXAIX. Fidelity removed the minimum investment threshold, which means you can start investing with as little as $1. This makes the fund accessible to investors at any income level.

4. Is FXAIX the same as investing in the S&P 500?

Functionally, yes. The Fidelity 500 Index Fund holds the same stocks as the S&P 500 in the same proportions and tracks the index’s performance with very low tracking error. Investing in FXAIX gives you returns that mirror the S&P 500 index minus the minimal expense ratio.

5. Can I hold FXAIX in a Roth IRA?

Yes. The Fidelity 500 Index Fund is available for purchase inside Fidelity Roth IRA accounts, traditional IRAs, and taxable brokerage accounts. Holding it inside a Roth IRA is particularly tax-efficient because your growth and withdrawals in retirement are tax-free.

6. How often does FXAIX pay dividends?

The Fidelity 500 Index Fund distributes dividends quarterly. You can choose to receive these dividends as cash or reinvest them automatically back into the fund. Most long-term investors choose to reinvest dividends to take full advantage of compounding.

7. What is the difference between FXAIX and FZROX?

FXAIX tracks the S&P 500, which includes approximately 500 large-cap US companies. FZROX is Fidelity’s zero-fee total market index fund that covers a broader range of US companies including small and mid-cap stocks. FZROX has a 0 percent expense ratio but is only available at Fidelity. FXAIX gives you large-cap focused exposure with nearly zero cost.

8. Is the Fidelity 500 Index Fund good for beginners?

Yes. The Fidelity 500 Index Fund is one of the most beginner-friendly investments available. It requires no stock-picking knowledge, charges minimal fees, has no minimum investment, and gives you instant diversification across 500 major US companies. Many financial advisors recommend it as a starting point for new investors.

9. Can I lose all my money in FXAIX?

It is theoretically possible but extremely unlikely. For FXAIX to go to zero, all 500 S&P 500 companies would need to go bankrupt simultaneously. What is realistic is significant short-term losses during market downturns. The fund dropped roughly 34 percent in early 2020 before recovering. Long-term investors who held through that drop recovered fully within months.

10. Does the Fidelity 500 Index Fund include international stocks?

No. FXAIX only holds US-listed stocks in the S&P 500. It does not include international or emerging market companies. If you want global diversification, you would need to pair it with an international index fund such as Fidelity’s own international index offerings.

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Email: johanharwen314@gmail.com
Author name: Johan harwen

About the Author: Johan Harwen is a personal finance writer and investment educator with over a decade of experience helping everyday investors navigate the world of index funds, retirement accounts, and long-term wealth building. He has written for leading financial publications and is known for translating complex investment concepts into plain, actionable language that actually makes sense to real people.Johan is a passionate advocate for low-cost passive investing and believes that most people do not need complex strategies to build serious wealth. They need clarity, consistency, and the patience to let compounding do its work over time.