OAYMX vs. RIDAX

Last updated Apr 1, 2026

Compare and contrast key facts about Oakmark Fund Advisor Class (OAYMX) and The Income Fund of America Class R-1 (RIDAX).

OAYMX is an actively managed fund by Oakmark. It was launched on Nov 30, 2016. RIDAX is an actively managed fund by American Funds. It was launched on Dec 1, 1973.

Performance

OAYMX vs. RIDAX - Performance Comparison

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

OAYMX vs. RIDAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
OAYMX Oakmark Fund Advisor Class	-4.11%	14.35%	16.24%	31.18%	-13.19%	34.49%	13.02%	27.25%	-12.66%	21.28%
RIDAX The Income Fund of America Class R-1	1.29%	16.83%	9.49%	6.16%	-7.14%	16.47%	3.68%	17.57%	-6.06%	11.86%

Returns By Period

In the year-to-date period, OAYMX achieves a -4.11% return, which is significantly lower than RIDAX's 1.29% return.

OAYMX

• 1D: 0.40%
• 1M: -5.35%
• YTD: -4.11%
• 6M: 0.53%
• 1Y: 8.36%
• 3Y*: 15.63%
• 5Y*: 11.05%
• 10Y*: —

RIDAX

• 1D: 0.23%
• 1M: -5.77%
• YTD: 1.29%
• 6M: 3.84%
• 1Y: 13.29%
• 3Y*: 10.98%
• 5Y*: 7.05%
• 10Y*: 7.35%

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

OAYMX vs. RIDAX - Expense Ratio Comparison

OAYMX has a 0.70% expense ratio, which is lower than RIDAX's 1.36% expense ratio.

RIDAX

The Income Fund of America Class R-1

OAYMX

Oakmark Fund Advisor Class

Return for Risk

OAYMX vs. RIDAX — Risk / Return Rank

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

OAYMX

OAYMX Risk / Return Rank: 18
OAYMX Sharpe Ratio Rank: 18
OAYMX Sortino Ratio Rank: 18
OAYMX Omega Ratio Rank: 18
OAYMX Calmar Ratio Rank: 18
OAYMX Martin Ratio Rank: 20

RIDAX

RIDAX Risk / Return Rank: 76
RIDAX Sharpe Ratio Rank: 80
RIDAX Sortino Ratio Rank: 79
RIDAX Omega Ratio Rank: 77
RIDAX Calmar Ratio Rank: 68
RIDAX Martin Ratio Rank: 77

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.

OAYMX vs. RIDAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Oakmark Fund Advisor Class (OAYMX) 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.

	OAYMX	RIDAX	Difference
Sharpe ratio Return per unit of total volatility	0.50	1.46	-0.96
Sortino ratio Return per unit of downside risk	0.82	2.01	-1.19
Omega ratio Gain probability vs. loss probability	1.12	1.30	-0.18
Calmar ratio Return relative to maximum drawdown	0.55	1.58	-1.03
Martin ratio Return relative to average drawdown	2.21	7.44	-5.23
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

OAYMX vs. RIDAX - Sharpe Ratio Comparison

The current OAYMX Sharpe Ratio is 0.50, which is lower than the RIDAX Sharpe Ratio of 1.46. The chart below compares the historical Sharpe Ratios of OAYMX and RIDAX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	OAYMX	RIDAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.50	1.46	-0.96
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.61	0.75	-0.14
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.69	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.61	0.67	-0.06

Correlation

The correlation between OAYMX and RIDAX is 0.85, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

OAYMX vs. RIDAX - Dividend Comparison

OAYMX's dividend yield for the trailing twelve months is around 1.17%, less than RIDAX's 9.14% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
OAYMX Oakmark Fund Advisor Class	1.17%	1.12%	1.30%	1.19%	1.16%	1.64%	0.27%	8.44%	8.35%	4.22%	0.00%	0.00%
RIDAX The Income Fund of America Class R-1	9.14%	9.24%	5.14%	2.38%	6.20%	5.92%	2.09%	4.25%	6.58%	3.68%	2.32%	4.26%

Drawdowns

OAYMX vs. RIDAX - Drawdown Comparison

The maximum OAYMX drawdown since its inception was -40.09%, smaller than the maximum RIDAX drawdown of -42.37%. Use the drawdown chart below to compare losses from any high point for OAYMX and RIDAX.

Drawdown Indicators

	OAYMX	RIDAX	Difference
Max Drawdown Largest peak-to-trough decline	-40.09%	-42.37%	+2.28%
Max Drawdown (1Y) Largest decline over 1 year	-13.46%	-8.25%	-5.21%
Max Drawdown (5Y) Largest decline over 5 years	-23.55%	-16.28%	-7.27%
Max Drawdown (10Y) Largest decline over 10 years	—	-26.22%	—
Current Drawdown Current decline from peak	-6.57%	-5.77%	-0.80%
Average Drawdown Average peak-to-trough decline	-5.58%	-4.42%	-1.16%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.36%	1.76%	+1.60%

Volatility

OAYMX vs. RIDAX - Volatility Comparison

Oakmark Fund Advisor Class (OAYMX) has a higher volatility of 3.69% compared to The Income Fund of America Class R-1 (RIDAX) at 2.91%. This indicates that OAYMX'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

	OAYMX	RIDAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.69%	2.91%	+0.78%
Volatility (6M) Calculated over the trailing 6-month period	10.20%	5.47%	+4.73%
Volatility (1Y) Calculated over the trailing 1-year period	18.73%	9.48%	+9.25%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.32%	9.46%	+8.86%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.66%	10.67%	+9.99%