OAYMX vs. ACIIX

Last updated Jun 4, 2026

OAYMX (Oakmark Fund Advisor Class) and ACIIX (American Century Equity Income Fund Class I) are both Large Cap Value Equities funds. Over the past 5 years, OAYMX returned 9.57%/yr vs 7.10%/yr for ACIIX. Their correlation of 0.83 suggests significant overlap in exposure. OAYMX charges 0.70%/yr vs 0.72%/yr for ACIIX.

Performance

OAYMX vs. ACIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Oakmark Fund Advisor Class (OAYMX) and American Century Equity Income Fund Class I (ACIIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, OAYMX achieves a -0.86% return, which is significantly lower than ACIIX's 6.29% return.

OAYMX

• 1D: -0.79%
• 1M: -0.38%
• YTD: -0.86%
• 6M: 2.18%
• 1Y: 11.66%
• 3Y*: 15.25%
• 5Y*: 9.57%
• 10Y*: —

ACIIX

• 1D: 0.56%
• 1M: 0.11%
• YTD: 6.29%
• 6M: 6.70%
• 1Y: 15.45%
• 3Y*: 10.83%
• 5Y*: 7.10%
• 10Y*: 8.88%

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

OAYMX vs. ACIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
OAYMX Oakmark Fund Advisor Class	-0.86%	14.35%	16.24%	31.18%	-13.19%	34.49%	13.02%	27.25%	-12.66%	21.28%
ACIIX American Century Equity Income Fund Class I	6.29%	12.05%	10.58%	4.25%	-2.96%	17.16%	1.19%	24.50%	-3.53%	13.69%

Correlation

The correlation between OAYMX and ACIIX is 0.75, 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	0.75
Correlation (3Y) Calculated over the trailing 3-year period	0.78
Correlation (5Y) Calculated over the trailing 5-year period	0.81
Correlation (All Time) Calculated using the full available price history since Dec 1, 2016	0.83

The correlation between OAYMX and ACIIX has been stable across timeframes, ranging from 0.75 to 0.83 - a consistent structural relationship.

Return for Risk

OAYMX vs. ACIIX — Risk / Return Rank

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

OAYMX

OAYMX Risk / Return Rank: 16
OAYMX Sharpe Ratio Rank: 13
OAYMX Sortino Ratio Rank: 13
OAYMX Omega Ratio Rank: 12
OAYMX Calmar Ratio Rank: 24
OAYMX Martin Ratio Rank: 17

ACIIX

ACIIX Risk / Return Rank: 42
ACIIX Sharpe Ratio Rank: 42
ACIIX Sortino Ratio Rank: 46
ACIIX Omega Ratio Rank: 39
ACIIX Calmar Ratio Rank: 43
ACIIX Martin Ratio Rank: 37

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. ACIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Oakmark Fund Advisor Class (OAYMX) and American Century Equity Income Fund Class I (ACIIX). 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	ACIIX	Difference
Sharpe ratio: Return per unit of total volatility	0.96	1.90	-0.94
Sortino ratio: Return per unit of downside risk	1.46	2.85	-1.39
Omega ratio: Gain probability vs. loss probability	1.18	1.33	-0.16
Calmar ratio: Return relative to maximum drawdown	1.80	2.50	-0.69
Martin ratio: Return relative to average drawdown	4.64	8.21	-3.57
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. ACIIX - Sharpe Ratio Comparison

The current OAYMX Sharpe Ratio is 0.96, which is lower than the ACIIX Sharpe Ratio of 1.90. The chart below compares the historical Sharpe Ratios of OAYMX and ACIIX, 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

	OAYMX	ACIIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.96	1.90	-0.94
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.53	0.66	-0.14
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.67	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.62	0.54	+0.09

Drawdowns

OAYMX vs. ACIIX - Drawdown Comparison

The maximum OAYMX drawdown since its inception was -40.09%, roughly equal to the maximum ACIIX drawdown of -39.16%. Use the drawdown chart below to compare losses from any high point for OAYMX and ACIIX.

Drawdown Indicators

	OAYMX	ACIIX	Difference
Max Drawdown Largest peak-to-trough decline	-40.09%	-39.16%	-0.93%
Max Drawdown (1Y) Largest decline over 1 year	-6.94%	-6.38%	-0.56%
Max Drawdown (3Y) Largest decline over 3 years	-17.02%	-10.15%	-6.87%
Max Drawdown (5Y) Largest decline over 5 years	-23.55%	-13.49%	-10.06%
Max Drawdown (10Y) Largest decline over 10 years	—	-32.76%	—
Current Drawdown Current decline from peak	-3.40%	-2.46%	-0.94%
Average Drawdown Average peak-to-trough decline	-5.54%	-5.24%	-0.30%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.69%	1.94%	+0.75%

Volatility

OAYMX vs. ACIIX - Volatility Comparison

Oakmark Fund Advisor Class (OAYMX) has a higher volatility of 2.92% compared to American Century Equity Income Fund Class I (ACIIX) at 2.19%. This indicates that OAYMX's price experiences larger fluctuations and is considered to be riskier than ACIIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	OAYMX	ACIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.92%	2.19%	+0.73%
Volatility (6M) Calculated over the trailing 6-month period	9.34%	6.11%	+3.23%
Volatility (1Y) Calculated over the trailing 1-year period	13.00%	8.37%	+4.63%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.27%	10.76%	+7.51%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.52%	13.38%	+7.14%

OAYMX vs. ACIIX - Expense Ratio Comparison

OAYMX has a 0.70% expense ratio, which is lower than ACIIX's 0.72% expense ratio.

Dividends

OAYMX vs. ACIIX - Dividend Comparison

OAYMX's dividend yield for the trailing twelve months is around 1.13%, less than ACIIX's 9.94% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACIIX American Century Equity Income Fund Class I	9.94%	10.55%	11.71%	8.21%	8.96%	7.02%	2.18%	7.57%	9.05%	12.14%	8.08%	10.72%
OAYMX Oakmark Fund Advisor Class	1.13%	1.12%	1.30%	1.19%	1.16%	1.64%	0.27%	8.44%	8.35%	4.22%	0.00%	0.00%

Frequently Asked Questions

Can I hold both OAYMX and ACIIX in my portfolio?

OAYMX and ACIIX have a correlation of 0.75, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, OAYMX or ACIIX?

OAYMX has higher volatility (2.92%) compared to ACIIX (2.19%). In terms of maximum drawdown, OAYMX dropped -40.09% vs ACIIX's -39.16%.

Which has better risk-adjusted returns?

ACIIX currently has the higher Sharpe Ratio (1.90 vs 0.96), 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.