Fidelity Index Funds Compared: FXAIX vs FNCMX vs FELX and How to Combine Them
Fidelity Index Funds Compared: FXAIX vs FNCMX vs FELX and How to Combine Them
What If Three Funds Could Cover Your Entire Retirement?
Most people overcomplicate their investment portfolio. They hold dozens of funds, chase the latest sector rotation, and end up with a tangled mess that underperforms a simple index strategy.
I've been studying a three-fund approach using Fidelity's index lineup, and the numbers make a compelling case for simplicity. Three funds — FXAIX, FNCMX, and FELX — each covering a different risk tier, and together they can build anything from a conservative retirement portfolio to an aggressive growth engine.
FXAIX: The Foundation
FXAIX is the Fidelity 500 Index Fund. It tracks the S&P 500 — the 500 largest companies in America. When you buy FXAIX, you're essentially buying a slice of the entire U.S. economy.
Expense ratio: 0.02%. That's as close to free as investing gets.
Over the past 10 years, FXAIX has averaged about 12.97% in annual share price appreciation. Not flashy, but that's exactly the point. This fund doesn't generate excitement. It generates consistency. In any portfolio, FXAIX plays one role: it makes sure you don't lose big.
When markets crash, the S&P 500 falls less than most alternatives. When markets recover, it's always part of the recovery. It's the bedrock.
FNCMX: The Growth Accelerator
FNCMX is the Fidelity NASDAQ Composite Index Fund. Instead of tracking the S&P 500, it follows the entire NASDAQ — which tilts heavily toward tech, biotech, and high-growth companies.
10-year average annual return: approximately 16.91%. That's nearly 4 percentage points above FXAIX.
Four percentage points might sound marginal. It isn't. Compounded over 20 years, that gap translates to hundreds of thousands of dollars in difference. FNCMX is where the portfolio's growth acceleration comes from.
The trade-off is volatility. When tech sells off, FNCMX drops harder than FXAIX. In a year like 2022, the difference in drawdown was significant. FNCMX sits at the bridge between safety and aggression — more reward than the broad market, but more pain during downturns.
FELX: The High-Risk Engine
FELX is the Fidelity Select Semiconductors Portfolio. It invests exclusively in semiconductor companies — the chipmakers behind every phone, every laptop, every AI model running today.
10-year average annual return: 22.04%. That's not a typo.
But semiconductors are cyclical. When this sector crashes, it crashes hard. This is a single-sector fund with zero diversification within it. The AI boom has been rocket fuel for FELX, but if the cycle turns, this fund can drag an entire portfolio down just as fast as it lifted it up.
FELX isn't a fund you casually add at 50% allocation. But in the right portfolio, at the right percentage, it becomes the engine that makes aggressive timelines possible.
Side-by-Side Comparison
| Metric | FXAIX | FNCMX | FELX |
|---|---|---|---|
| Tracks | S&P 500 | NASDAQ Composite | Semiconductor Sector |
| Expense Ratio | 0.02% | Low | Sector-level |
| 10-Year Avg Return | 12.97% | 16.91% | 22.04% |
| Risk Level | Low | Medium | High |
| Portfolio Role | Stable foundation | Growth bridge | High-return engine |
| Best For | All investors | Growth-oriented | Aggressive timelines |
How Allocation Changes Everything
The same three funds produce completely different portfolios depending on how you weight them.
A conservative split — 60% FXAIX, 30% FNCMX, 10% FELX — produces a blended return around 15% annually with a 0.81% dividend yield and 6.18% dividend growth rate. Stable, proven, and ideal for a 30-year runway.
An aggressive split — 15% FXAIX, 35% FNCMX, 50% FELX — pushes the blended return toward 18-19% annually. That's the kind of growth that can turn $0 into a million in a decade. But the volatility is real, and you need the stomach for it.
What I find most valuable about this approach is the ability to adjust within the same three funds over time. Start aggressive when you're young, gradually shift toward FXAIX as retirement approaches. The framework stays the same; only the ratios change.
FAQ
Q: Can I just use FXAIX alone for retirement? A: Yes. A single S&P 500 fund at 12.97% annual growth is a legitimate strategy. You'll need more time or higher contributions to reach the same goal, but the simplicity has real value.
Q: Will FELX's 22% returns continue? A: No guarantee. Semiconductors have benefited enormously from the AI boom. Past performance doesn't predict future results. The 22% figure reflects a particularly strong decade for chips.
Q: How do I replicate this outside Fidelity? A: Use equivalent ETFs — SPY or VOO for FXAIX, QQQ for FNCMX, and SOXX or SMH for FELX. The underlying indices are the same.
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