RFNGX vs. CGFAX
RFNGX (American Funds Fundamental Investors Fund Class R6) and CGFAX (American Funds The Growth Fund of America Class 529-A) are both Large Cap Growth Equities funds from Capital Group. Both are actively managed. Over the past 10 years, RFNGX returned 14.74%/yr vs 15.19%/yr for CGFAX. Their 0.96 correlation means they have historically moved very closely together. RFNGX charges 0.28%/yr vs 0.62%/yr for CGFAX.
Performance
RFNGX vs. CGFAX - Performance Comparison
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Returns By Period
In the year-to-date period, RFNGX achieves a 13.39% return, which is significantly higher than CGFAX's 5.59% return. Both investments have delivered pretty close results over the past 10 years, with RFNGX having a 14.74% annualized return and CGFAX not far ahead at 15.19%.
RFNGX
- 1D
- 0.96%
- 1M
- 0.00%
- 6M
- 8.75%
- YTD
- 13.39%
- 1Y
- 26.21%
- 3Y*
- 22.68%
- 5Y*
- 14.24%
- 10Y*
- 14.74%
- ALL TIME*
- 13.54%
CGFAX
- 1D
- 1.17%
- 1M
- -2.12%
- 6M
- 4.73%
- YTD
- 5.59%
- 1Y
- 14.18%
- 3Y*
- 20.24%
- 5Y*
- 10.33%
- 10Y*
- 15.19%
- ALL TIME*
- 10.63%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $0.00 | $0.00 | $0.00 | |
| $0.00 | $0.00 | $0.00 |
RFNGX vs. CGFAX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
RFNGX American Funds Fundamental Investors Fund Class R6 | 13.39% | 24.58% | 22.77% | 26.25% | -16.38% | 22.83% | 13.72% | 27.48% | -7.09% | 23.15% |
CGFAX American Funds The Growth Fund of America Class 529-A | 5.59% | 19.69% | 27.99% | 37.14% | -30.76% | 19.26% | 37.81% | 28.09% | -3.25% | 26.06% |
Correlation
The correlation between RFNGX and CGFAX is 0.96 - they have historically moved very closely together. At this level, their price movements offset little of one another.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.96 |
Correlation (3Y) Balances recent behavior with more history. | 0.96 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.96 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.95 |
Correlation (All Time) Calculated using the full available price history since Jan 4, 2010 | 0.96 |
The correlation between RFNGX and CGFAX has been stable across timeframes, ranging from 0.95 to 0.96 - a consistent structural relationship.
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Return for Risk
RFNGX vs. CGFAX — Risk / Return Rank
RFNGX
CGFAX
RFNGX vs. CGFAX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for American Funds Fundamental Investors Fund Class R6 (RFNGX) and American Funds The Growth Fund of America Class 529-A (CGFAX). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| RFNGX | CGFAX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.86 | ||
| Sortino ratioReturn per unit of downside risk | +1.11 | ||
| Omega ratioGain probability vs. loss probability | 1.28 | 1.14 | +0.14 |
| Calmar ratioReturn relative to maximum drawdown | 2.27 | 0.90 | +1.37 |
| Martin ratioReturn relative to average drawdown | 9.81 | 3.24 | +6.57 |
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Drawdowns
RFNGX vs. CGFAX - Drawdown Comparison
The maximum RFNGX drawdown since its inception was -33.90%, smaller than the maximum CGFAX drawdown of -51.91%. Use the drawdown chart below to compare losses from any high point for RFNGX and CGFAX.
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Drawdown Indicators
| RFNGX | CGFAX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -33.90% | -51.91% | +18.01% |
Max Drawdown (1Y)Largest decline over 1 year | -10.62% | -13.77% | +3.15% |
Max Drawdown (3Y)Largest decline over 3 years | -17.92% | -21.58% | +3.66% |
Max Drawdown (5Y)Largest decline over 5 years | -24.88% | -36.39% | +11.51% |
Max Drawdown (10Y)Largest decline over 10 years | -33.90% | -36.39% | +2.49% |
Current DrawdownCurrent decline from peak | -1.64% | -4.38% | +2.74% |
Average DrawdownAverage peak-to-trough decline | -4.00% | -8.57% | +4.57% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 2.45% | 3.80% | -1.35% |
Volatility
RFNGX vs. CGFAX - Volatility Comparison
The current volatility for American Funds Fundamental Investors Fund Class R6 (RFNGX) is 4.30%, while American Funds The Growth Fund of America Class 529-A (CGFAX) has a volatility of 5.01%. This indicates that RFNGX experiences smaller price fluctuations and is considered to be less risky than CGFAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| RFNGX | CGFAX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 4.30% | 5.01% | -0.71% |
Volatility (6M)Calculated over the trailing 6-month period | 12.16% | 13.69% | -1.53% |
Volatility (1Y)Calculated over the trailing 1-year period | 15.19% | 16.94% | -1.75% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 17.01% | 20.56% | -3.55% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 17.77% | 19.79% | -2.02% |
RFNGX vs. CGFAX - Expense Ratio Comparison
RFNGX has a 0.28% expense ratio, which is lower than CGFAX's 0.62% expense ratio.
Dividends
RFNGX vs. CGFAX - Dividend Comparison
RFNGX's dividend yield for the trailing twelve months is around 7.63%, less than CGFAX's 10.31% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
CGFAX American Funds The Growth Fund of America Class 529-A | 10.31% | 10.88% | 9.12% | 7.48% | 4.09% | 8.26% | 4.34% | 7.18% | 12.03% | 7.07% | 6.60% | 8.86% |
RFNGX American Funds Fundamental Investors Fund Class R6 | 7.63% | 8.82% | 8.91% | 6.10% | 5.33% | 11.29% | 1.77% | 7.21% | 10.67% | 7.56% | 5.01% | 6.01% |
Frequently Asked Questions
With a correlation of 0.96, RFNGX and CGFAX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.
CGFAX has higher volatility (5.01%) compared to RFNGX (4.30%). In terms of maximum drawdown, RFNGX dropped -33.90% vs CGFAX's -51.91%.
RFNGX currently has the higher Sharpe Ratio (1.59 vs 0.73), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.
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