FXAIX – Fidelity 500 Index Fund Tracking the Performance of the S&P 500 for Long-Term Wealth Growth
Apr 20, 2026
FXAIX is one of the most popular and cheapest ways to invest in the U.S. stock market. It is a mutual fund from Fidelity that tracks the performance of the S&P 500 index.
In simple terms, FXAIX lets you invest in about 500 of the largest U.S. companies in a single fund.
What is FXAIX?
FXAIX is a passively managed index fund, meaning it does not try to “beat the market.” Instead, it mirrors the S&P 500, which includes companies like Apple, Microsoft, Amazon, and NVIDIA.
It is designed for long-term investors who want:
Simple investing
Broad market exposure
Low fees
Steady long-term growth
Key Features of FXAIX
Based on recent fund data:
Tracks the S&P 500 index (StockAnalysis)
Expense ratio: ~0.015% (very low) (StockAnalysis)
Holds ~500+ large U.S. companies (StockAnalysis)
Very high assets under management (~$700B+) (StockAnalysis)
Pays dividends quarterly (StockAnalysis)
Why Investors Like FXAIX
People choose FXAIX because it is:
Extremely low cost
Easy to understand
Strong long-term historical performance
Good for retirement accounts (Roth IRA, 401k)
Passive (no emotional trading decisions)
It’s often used as a “core holding” in portfolios.
FXAIX vs Other Index Funds
| Feature | FXAIX | VFIAX | VTSAX |
|---|---|---|---|
| Index | S&P 500 | S&P 500 | Entire U.S. market |
| Companies | ~500 | ~500 | 3,000+ |
| Diversification | Medium | Medium | High |
| Expense ratio | Very low | Low | Low |
| Style | Large U.S. stocks | Large U.S. stocks | Whole market |
So FXAIX = simple S&P 500 exposure.
Risks of FXAIX
Even though it is stable compared to individual stocks, it still has risks:
Depends heavily on U.S. economy
Big tech stocks dominate returns
Market crashes still affect it
Not globally diversified
Final Thoughts
FXAIX is one of the simplest and cheapest ways to invest in the U.S. stock market. It gives instant exposure to 500 major companies and is widely used for long-term wealth building.
