RIDGX vs. AMCPX

Last updated Jun 23, 2026

RIDGX (American Funds Income Fund of America Class R-6) and AMCPX (American Funds AMCAP Fund Class A) are both mutual funds - RIDGX is a Global Allocation fund managed by American Funds, while AMCPX is a Large Cap Growth Equities fund actively managed by American Funds. Over the past 10 years, RIDGX returned 8.74%/yr vs 12.36%/yr for AMCPX. Their correlation of 0.82 suggests significant overlap in exposure. RIDGX charges 0.26%/yr vs 0.64%/yr for AMCPX.

Performance

RIDGX vs. AMCPX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds Income Fund of America Class R-6 (RIDGX) and American Funds AMCAP Fund Class A (AMCPX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both stocks are quite close, with RIDGX having a 5.64% return and AMCPX slightly lower at 5.53%. Over the past 10 years, RIDGX has underperformed AMCPX with an annualized return of 8.74%, while AMCPX has yielded a comparatively higher 12.36% annualized return.

RIDGX

• 1D: -0.40%
• 1M: -0.99%
• YTD: 5.64%
• 6M: 5.72%
• 1Y: 14.57%
• 3Y*: 13.10%
• 5Y*: 8.40%
• 10Y*: 8.74%

AMCPX

• 1D: 1.49%
• 1M: 1.54%
• YTD: 5.53%
• 6M: 5.33%
• 1Y: 20.65%
• 3Y*: 18.68%
• 5Y*: 9.06%
• 10Y*: 12.36%

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

RIDGX vs. AMCPX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
RIDGX American Funds Income Fund of America Class R-6	5.64%	18.12%	11.22%	7.04%	-6.15%	17.72%	5.24%	18.84%	-4.96%	12.80%
AMCPX American Funds AMCAP Fund Class A	5.53%	17.68%	21.11%	31.04%	-28.67%	20.57%	21.42%	26.35%	-4.42%	22.08%

Correlation

The correlation between RIDGX and AMCPX is 0.58, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.58
Correlation (3Y) Calculated over the trailing 3-year period	0.68
Correlation (5Y) Calculated over the trailing 5-year period	0.73
Correlation (10Y) Calculated over the trailing 10-year period	0.77
Correlation (All Time) Calculated using the full available price history since Jan 4, 2010	0.82

Over the past year, the correlation between RIDGX and AMCPX has dropped to 0.58 - well below their long-term average of 0.82, suggesting their price drivers have been diverging.

Return for Risk

RIDGX vs. AMCPX — Risk / Return Rank

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

RIDGX

RIDGX Risk / Return Rank: 48
RIDGX Sharpe Ratio Rank: 52
RIDGX Sortino Ratio Rank: 52
RIDGX Omega Ratio Rank: 50
RIDGX Calmar Ratio Rank: 43
RIDGX Martin Ratio Rank: 45

AMCPX

AMCPX Risk / Return Rank: 23
AMCPX Sharpe Ratio Rank: 24
AMCPX Sortino Ratio Rank: 23
AMCPX Omega Ratio Rank: 25
AMCPX Calmar Ratio Rank: 18
AMCPX Martin Ratio Rank: 25

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.

RIDGX vs. AMCPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds Income Fund of America Class R-6 (RIDGX) and American Funds AMCAP Fund Class A (AMCPX). 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.

	RIDGX	AMCPX	Difference
Sharpe ratio: Return per unit of total volatility	1.97	1.32	+0.65
Sortino ratio: Return per unit of downside risk	2.78	1.87	+0.91
Omega ratio: Gain probability vs. loss probability	1.35	1.24	+0.11
Calmar ratio: Return relative to maximum drawdown	2.40	1.43	+0.97
Martin ratio: Return relative to average drawdown	8.93	5.70	+3.23

RIDGX vs. AMCPX - Sharpe Ratio Comparison

The current RIDGX Sharpe Ratio is 1.97, which is higher than the AMCPX Sharpe Ratio of 1.32. The chart below compares the historical Sharpe Ratios of RIDGX and AMCPX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

RIDGX vs. AMCPX - Drawdown Comparison

The maximum RIDGX drawdown since its inception was -26.09%, smaller than the maximum AMCPX drawdown of -62.37%. Use the drawdown chart below to compare losses from any high point for RIDGX and AMCPX.

Drawdown Indicators

	RIDGX	AMCPX	Difference
Max Drawdown Largest peak-to-trough decline	-26.09%	-62.37%	+36.28%
Max Drawdown (1Y) Largest decline over 1 year	-6.09%	-14.18%	+8.09%
Max Drawdown (3Y) Largest decline over 3 years	-8.58%	-19.71%	+11.13%
Max Drawdown (5Y) Largest decline over 5 years	-15.62%	-36.90%	+21.28%
Max Drawdown (10Y) Largest decline over 10 years	-26.09%	-36.90%	+10.81%
Current Drawdown Current decline from peak	-1.91%	-1.53%	-0.38%
Average Drawdown Average peak-to-trough decline	-2.56%	-9.57%	+7.01%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.63%	3.55%	-1.92%

Volatility

RIDGX vs. AMCPX - Volatility Comparison

The current volatility for American Funds Income Fund of America Class R-6 (RIDGX) is 2.33%, while American Funds AMCAP Fund Class A (AMCPX) has a volatility of 5.90%. This indicates that RIDGX experiences smaller price fluctuations and is considered to be less risky than AMCPX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	RIDGX	AMCPX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.33%	5.90%	-3.57%
Volatility (6M) Calculated over the trailing 6-month period	5.86%	12.43%	-6.57%
Volatility (1Y) Calculated over the trailing 1-year period	7.43%	15.38%	-7.95%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	9.49%	19.37%	-9.88%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	10.70%	18.78%	-8.08%

RIDGX vs. AMCPX - Expense Ratio Comparison

RIDGX has a 0.26% expense ratio, which is lower than AMCPX's 0.64% expense ratio.

Dividends

RIDGX vs. AMCPX - Dividend Comparison

RIDGX's dividend yield for the trailing twelve months is around 9.84%, less than AMCPX's 12.62% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AMCPX American Funds AMCAP Fund Class A	12.62%	8.73%	8.19%	3.26%	7.54%	3.43%	3.88%	4.90%	7.84%	5.37%	3.81%	8.86%
RIDGX American Funds Income Fund of America Class R-6	9.84%	10.25%	6.69%	3.16%	7.31%	6.97%	3.49%	5.29%	7.78%	4.46%	3.37%	5.38%

Frequently Asked Questions

Can I hold both RIDGX and AMCPX in my portfolio?

RIDGX and AMCPX have a correlation of 0.58, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, RIDGX or AMCPX?

AMCPX has higher volatility (5.90%) compared to RIDGX (2.33%). In terms of maximum drawdown, RIDGX dropped -26.09% vs AMCPX's -62.37%.

Which has better risk-adjusted returns?

RIDGX currently has the higher Sharpe Ratio (1.97 vs 1.32), 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.