AMFFX vs. RIDAX

Last updated Jun 4, 2026

AMFFX (American Mutual Fund Class F-1) and RIDAX (The Income Fund of America Class R-1) are both Large Cap Value Equities funds from American Funds. Both are actively managed. Over the past 10 years, AMFFX returned 11.19%/yr vs 7.65%/yr for RIDAX. Their correlation of 0.94 suggests significant overlap in exposure. AMFFX charges 0.64%/yr vs 1.36%/yr for RIDAX.

Performance

AMFFX vs. RIDAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Mutual Fund Class F-1 (AMFFX) and The Income Fund of America Class R-1 (RIDAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, AMFFX achieves a 6.63% return, which is significantly higher than RIDAX's 5.99% return. Over the past 10 years, AMFFX has outperformed RIDAX with an annualized return of 11.19%, while RIDAX has yielded a comparatively lower 7.65% annualized return.

AMFFX

• 1D: 0.62%
• 1M: 2.95%
• YTD: 6.63%
• 6M: 6.84%
• 1Y: 17.19%
• 3Y*: 15.42%
• 5Y*: 10.29%
• 10Y*: 11.19%

RIDAX

• 1D: 0.33%
• 1M: 0.89%
• YTD: 5.99%
• 6M: 6.96%
• 1Y: 14.85%
• 3Y*: 12.77%
• 5Y*: 6.87%
• 10Y*: 7.65%

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

AMFFX vs. RIDAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
AMFFX American Mutual Fund Class F-1	6.63%	15.99%	14.87%	9.36%	-4.54%	25.04%	4.73%	21.48%	-2.37%	17.44%
RIDAX The Income Fund of America Class R-1	5.99%	16.83%	9.49%	6.16%	-7.14%	16.47%	3.68%	17.57%	-6.06%	11.86%

Correlation

The correlation between AMFFX and RIDAX is 0.89, 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	0.89
Correlation (3Y) Calculated over the trailing 3-year period	0.90
Correlation (5Y) Calculated over the trailing 5-year period	0.93
Correlation (10Y) Calculated over the trailing 10-year period	0.93
Correlation (All Time) Calculated using the full available price history since Jan 3, 2003	0.94

The correlation between AMFFX and RIDAX has been stable across timeframes, ranging from 0.89 to 0.94 - a consistent structural relationship.

Return for Risk

AMFFX vs. RIDAX — Risk / Return Rank

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

AMFFX

AMFFX Risk / Return Rank: 40
AMFFX Sharpe Ratio Rank: 41
AMFFX Sortino Ratio Rank: 39
AMFFX Omega Ratio Rank: 40
AMFFX Calmar Ratio Rank: 35
AMFFX Martin Ratio Rank: 42

RIDAX

RIDAX Risk / Return Rank: 48
RIDAX Sharpe Ratio Rank: 52
RIDAX Sortino Ratio Rank: 51
RIDAX Omega Ratio Rank: 50
RIDAX Calmar Ratio Rank: 43
RIDAX Martin Ratio Rank: 43

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.

AMFFX vs. RIDAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Mutual Fund Class F-1 (AMFFX) and The Income Fund of America Class R-1 (RIDAX). 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.

	AMFFX	RIDAX	Difference
Sharpe ratio: Return per unit of total volatility	1.87	2.12	-0.25
Sortino ratio: Return per unit of downside risk	2.63	3.00	-0.37
Omega ratio: Gain probability vs. loss probability	1.34	1.39	-0.05
Calmar ratio: Return relative to maximum drawdown	2.24	2.47	-0.23
Martin ratio: Return relative to average drawdown	9.01	9.14	-0.13
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

AMFFX vs. RIDAX - Sharpe Ratio Comparison

The current AMFFX Sharpe Ratio is 1.87, which is comparable to the RIDAX Sharpe Ratio of 2.12. The chart below compares the historical Sharpe Ratios of AMFFX and RIDAX, 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

	AMFFX	RIDAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.87	2.12	-0.25
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.83	0.73	+0.10
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.80	0.72	+0.08
Sharpe Ratio (All Time) Calculated using the full available price history	0.56	0.68	-0.12

Drawdowns

AMFFX vs. RIDAX - Drawdown Comparison

The maximum AMFFX drawdown since its inception was -48.76%, which is greater than RIDAX's maximum drawdown of -42.37%. Use the drawdown chart below to compare losses from any high point for AMFFX and RIDAX.

Drawdown Indicators

	AMFFX	RIDAX	Difference
Max Drawdown Largest peak-to-trough decline	-48.76%	-42.37%	-6.39%
Max Drawdown (1Y) Largest decline over 1 year	-7.93%	-6.13%	-1.80%
Max Drawdown (3Y) Largest decline over 3 years	-12.95%	-8.71%	-4.24%
Max Drawdown (5Y) Largest decline over 5 years	-15.32%	-16.28%	+0.96%
Max Drawdown (10Y) Largest decline over 10 years	-29.83%	-26.22%	-3.61%
Current Drawdown Current decline from peak	0.00%	-1.40%	+1.40%
Average Drawdown Average peak-to-trough decline	-5.73%	-4.40%	-1.33%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.97%	1.65%	+0.32%

Volatility

AMFFX vs. RIDAX - Volatility Comparison

American Mutual Fund Class F-1 (AMFFX) has a higher volatility of 2.35% compared to The Income Fund of America Class R-1 (RIDAX) at 2.03%. This indicates that AMFFX's price experiences larger fluctuations and is considered to be riskier than RIDAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	AMFFX	RIDAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.35%	2.03%	+0.32%
Volatility (6M) Calculated over the trailing 6-month period	7.35%	5.61%	+1.74%
Volatility (1Y) Calculated over the trailing 1-year period	9.50%	7.13%	+2.37%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	12.50%	9.48%	+3.02%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	14.12%	10.69%	+3.43%

AMFFX vs. RIDAX - Expense Ratio Comparison

AMFFX has a 0.64% expense ratio, which is lower than RIDAX's 1.36% expense ratio.

Dividends

AMFFX vs. RIDAX - Dividend Comparison

AMFFX's dividend yield for the trailing twelve months is around 7.09%, less than RIDAX's 8.74% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AMFFX American Mutual Fund Class F-1	7.09%	7.53%	6.26%	3.72%	4.84%	4.73%	1.95%	4.56%	6.38%	5.89%	4.78%	6.48%
RIDAX The Income Fund of America Class R-1	8.74%	9.24%	5.14%	2.38%	6.20%	5.92%	2.09%	4.25%	6.58%	3.68%	2.32%	4.26%

Frequently Asked Questions

Can I hold both AMFFX and RIDAX in my portfolio?

AMFFX and RIDAX have a correlation of 0.89, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, AMFFX or RIDAX?

AMFFX has higher volatility (2.35%) compared to RIDAX (2.03%). In terms of maximum drawdown, AMFFX dropped -48.76% vs RIDAX's -42.37%.

Which has better risk-adjusted returns?

RIDAX currently has the higher Sharpe Ratio (2.12 vs 1.87), 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.