AGTHX vs. RFNBX

Last updated Jun 6, 2026

AGTHX (American Funds The Growth Fund of America Class A) and RFNBX (American Funds Fundamental Investors Fund Class R2) are both mutual funds - AGTHX is a Large Cap Growth Equities fund actively managed by Capital Group, while RFNBX is a Large Cap Blend Equities fund actively managed by Capital Group. Both are actively managed. Over the past 10 years, AGTHX returned 15.82%/yr vs 13.67%/yr for RFNBX. With a 0.96 correlation, they move nearly in lockstep. AGTHX charges 0.59%/yr vs 1.36%/yr for RFNBX.

Performance

AGTHX vs. RFNBX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds The Growth Fund of America Class A (AGTHX) and American Funds Fundamental Investors Fund Class R2 (RFNBX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, AGTHX achieves a 9.40% return, which is significantly lower than RFNBX's 13.68% return. Over the past 10 years, AGTHX has outperformed RFNBX with an annualized return of 15.82%, while RFNBX has yielded a comparatively lower 13.67% annualized return.

AGTHX

• 1D: 0.17%
• 1M: 3.31%
• YTD: 9.40%
• 6M: 8.72%
• 1Y: 25.36%
• 3Y*: 24.99%
• 5Y*: 12.12%
• 10Y*: 15.82%

RFNBX

• 1D: -0.25%
• 1M: 2.00%
• YTD: 13.68%
• 6M: 14.29%
• 1Y: 31.84%
• 3Y*: 24.88%
• 5Y*: 13.62%
• 10Y*: 13.67%

*Multi-year figures are annualized to reflect compound growth (CAGR)

AGTHX vs. RFNBX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
AGTHX American Funds The Growth Fund of America Class A	9.40%	19.73%	28.02%	37.22%	-30.75%	19.32%	37.83%	28.16%	-3.15%	26.14%
RFNBX American Funds Fundamental Investors Fund Class R2	13.68%	23.22%	21.80%	24.89%	-17.32%	21.49%	12.51%	26.09%	-8.89%	21.82%

Correlation

The correlation between AGTHX and RFNBX is 0.95, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.95
Correlation (3Y) Calculated over the trailing 3-year period	0.96
Correlation (5Y) Calculated over the trailing 5-year period	0.96
Correlation (10Y) Calculated over the trailing 10-year period	0.95
Correlation (All Time) Calculated using the full available price history since Jan 3, 2003	0.96

The correlation between AGTHX and RFNBX has been stable across timeframes, ranging from 0.95 to 0.96 - a consistent structural relationship.

Return for Risk

AGTHX vs. RFNBX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

AGTHX

AGTHX Risk / Return Rank: 32
AGTHX Sharpe Ratio Rank: 36
AGTHX Sortino Ratio Rank: 33
AGTHX Omega Ratio Rank: 35
AGTHX Calmar Ratio Rank: 26
AGTHX Martin Ratio Rank: 32

RFNBX

RFNBX Risk / Return Rank: 66
RFNBX Sharpe Ratio Rank: 67
RFNBX Sortino Ratio Rank: 60
RFNBX Omega Ratio Rank: 61
RFNBX Calmar Ratio Rank: 64
RFNBX Martin Ratio Rank: 76

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

AGTHX vs. RFNBX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds The Growth Fund of America Class A (AGTHX) and American Funds Fundamental Investors Fund Class R2 (RFNBX). 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.

	AGTHX	RFNBX	Difference
Sharpe ratio: Return per unit of total volatility	1.65	2.33	-0.68
Sortino ratio: Return per unit of downside risk	2.28	3.16	-0.88
Omega ratio: Gain probability vs. loss probability	1.30	1.42	-0.12
Calmar ratio: Return relative to maximum drawdown	1.82	2.98	-1.16
Martin ratio: Return relative to average drawdown	7.09	13.71	-6.62
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

AGTHX vs. RFNBX - Sharpe Ratio Comparison

The current AGTHX Sharpe Ratio is 1.65, which is comparable to the RFNBX Sharpe Ratio of 2.33. The chart below compares the historical Sharpe Ratios of AGTHX and RFNBX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	AGTHX	RFNBX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.65	2.33	-0.68
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.60	0.81	-0.21
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.81	0.77	+0.03
Sharpe Ratio (All Time) Calculated using the full available price history	0.71	0.60	+0.11

Drawdowns

AGTHX vs. RFNBX - Drawdown Comparison

The maximum AGTHX drawdown since its inception was -51.91%, roughly equal to the maximum RFNBX drawdown of -53.81%. Use the drawdown chart below to compare losses from any high point for AGTHX and RFNBX.

Drawdown Indicators

	AGTHX	RFNBX	Difference
Max Drawdown Largest peak-to-trough decline	-51.91%	-53.81%	+1.90%
Max Drawdown (1Y) Largest decline over 1 year	-13.76%	-10.78%	-2.98%
Max Drawdown (3Y) Largest decline over 3 years	-21.57%	-18.11%	-3.46%
Max Drawdown (5Y) Largest decline over 5 years	-36.38%	-25.53%	-10.85%
Max Drawdown (10Y) Largest decline over 10 years	-36.38%	-33.96%	-2.42%
Current Drawdown Current decline from peak	-0.96%	-0.95%	-0.01%
Average Drawdown Average peak-to-trough decline	-9.20%	-7.24%	-1.96%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.52%	2.34%	+1.18%

Volatility

AGTHX vs. RFNBX - Volatility Comparison

American Funds The Growth Fund of America Class A (AGTHX) and American Funds Fundamental Investors Fund Class R2 (RFNBX) have volatilities of 3.81% and 3.79%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	AGTHX	RFNBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.81%	3.79%	+0.02%
Volatility (6M) Calculated over the trailing 6-month period	11.65%	10.80%	+0.85%
Volatility (1Y) Calculated over the trailing 1-year period	15.16%	13.76%	+1.40%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	20.24%	16.80%	+3.44%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.69%	17.73%	+1.96%

AGTHX vs. RFNBX - Expense Ratio Comparison

AGTHX has a 0.59% expense ratio, which is lower than RFNBX's 1.36% expense ratio.

Dividends

AGTHX vs. RFNBX - Dividend Comparison

AGTHX's dividend yield for the trailing twelve months is around 9.78%, more than RFNBX's 6.94% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AGTHX American Funds The Growth Fund of America Class A	9.78%	10.69%	8.99%	7.40%	4.05%	8.18%	4.30%	7.15%	11.99%	7.03%	6.61%	8.87%
RFNBX American Funds Fundamental Investors Fund Class R2	6.94%	7.90%	8.19%	5.13%	4.16%	10.27%	0.83%	6.20%	8.38%	6.54%	3.99%	5.32%

Frequently Asked Questions

Can I hold both AGTHX and RFNBX in my portfolio?

With a correlation of 0.95, AGTHX and RFNBX 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.

Which is riskier, AGTHX or RFNBX?

AGTHX has higher volatility (3.81%) compared to RFNBX (3.79%). In terms of maximum drawdown, AGTHX dropped -51.91% vs RFNBX's -53.81%.

Which has better risk-adjusted returns?

RFNBX currently has the higher Sharpe Ratio (2.33 vs 1.65), 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.