FXAIX – Fidelity 500 Index Fund Tracking the Performance of the S&P 500 for Long-Term Wealth Growth
Apr 20, 2026
The FXAIX is one of the most popular and lowest-cost ways to invest in the U.S. stock market. It is a mutual fund offered by Fidelity Investments and is designed to track the performance of the S&P 500 index, which includes about 500 of the largest American companies.
In simple terms: FXAIX lets you invest in big companies like Apple, Microsoft, Amazon, and NVIDIA—all in one fund.
What is FXAIX?
FXAIX is an index mutual fund that follows the S&P 500.
It works by:
Holding the same companies as the S&P 500
Matching their weight in the index
Updating automatically when the index changes
According to fund data, it holds around 500+ stocks and manages hundreds of billions in assets, making it one of the largest index funds available. (StockAnalysis)
Why investors choose FXAIX
1. Extremely low fees
FXAIX has an expense ratio of about 0.015%, meaning you pay almost nothing to invest. (StockAnalysis)
2. Simple investing
You don’t need to pick stocks—just buy the fund.
3. Strong long-term returns
It tracks the S&P 500, which has historically grown over long periods (with ups and downs).
4. Big company exposure
You automatically own major U.S. corporations.
What companies are inside FXAIX?
FXAIX includes the biggest names in the U.S. economy, such as:
Apple
Microsoft
NVIDIA
Amazon
Meta Platforms
These companies dominate the fund’s performance.
FXAIX vs other index funds
| Fund | What it tracks | Coverage |
|---|---|---|
| FXAIX | S&P 500 | Top 500 U.S. companies |
| VFIAX | S&P 500 | Same index (Vanguard version) |
| VTSAX | Total U.S. market | Large + mid + small caps |
FXAIX is basically a simple “top U.S. companies only” fund.
Risks of FXAIX
Even though it is diversified, it still has risks:
Market risk
If the U.S. stock market drops, FXAIX drops too.
Tech concentration
A large part is heavily weighted toward big tech companies.
No international exposure
It only covers U.S. stocks.
Who should invest in FXAIX?
FXAIX is usually good for:
Long-term investors (10+ years)
Retirement savings
Beginner investors
People who want a simple portfolio
It is not designed for short-term trading or quick profits.
FXAIX vs ETFs (important note)
FXAIX = mutual fund (priced once per day)
ETFs = trade like stocks during the day
Both track similar markets, but FXAIX is often chosen for retirement accounts.
Final takeaway
FXAIX is one of the simplest and cheapest ways to invest in the largest companies in the United States. It doesn’t try to beat the market—it just follows it.
If you want a low-effort, long-term investment strategy, FXAIX is often considered a strong “core holding” fund.
SEO Title: FXAIX Explained: The Low-Cost Way to Track the S&P 500 (2026 Guide)
Meta Description: Learn what FXAIX is, how it works, its holdings, fees, risks, and why Fidelity’s S&P 500 index fund is popular for long-term investing in 2026.
