OANMX vs. TWEIX

Last updated Apr 2, 2026

Compare and contrast key facts about Oakmark Fund Institutional Class (OANMX) and American Century Equity Income Fund (TWEIX).

OANMX is managed by Oakmark. It was launched on Nov 30, 2016. TWEIX is managed by American Century. It was launched on Aug 1, 1994.

Performance

OANMX vs. TWEIX - Performance Comparison

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

OANMX vs. TWEIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
OANMX Oakmark Fund Institutional Class	-2.41%	14.38%	16.28%	31.21%	-13.18%	34.87%	13.09%	27.35%	-12.62%	15.96%
TWEIX American Century Equity Income Fund	3.53%	11.84%	10.51%	3.92%	-3.06%	16.83%	1.10%	24.14%	-3.77%	12.71%

Returns By Period

In the year-to-date period, OANMX achieves a -2.41% return, which is significantly lower than TWEIX's 3.53% return.

OANMX

• 1D: 1.76%
• 1M: -3.55%
• YTD: -2.41%
• 6M: 2.42%
• 1Y: 10.38%
• 3Y*: 16.34%
• 5Y*: 11.18%
• 10Y*: —

TWEIX

• 1D: 0.92%
• 1M: -4.70%
• YTD: 3.53%
• 6M: 5.61%
• 1Y: 11.13%
• 3Y*: 9.80%
• 5Y*: 7.37%
• 10Y*: 8.76%

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

OANMX vs. TWEIX - Expense Ratio Comparison

OANMX has a 0.68% expense ratio, which is lower than TWEIX's 0.94% expense ratio.

TWEIX

American Century Equity Income Fund

OANMX

Oakmark Fund Institutional Class

Return for Risk

OANMX vs. TWEIX — Risk / Return Rank

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

OANMX

OANMX Risk / Return Rank: 23
OANMX Sharpe Ratio Rank: 19
OANMX Sortino Ratio Rank: 19
OANMX Omega Ratio Rank: 20
OANMX Calmar Ratio Rank: 27
OANMX Martin Ratio Rank: 29

TWEIX

TWEIX Risk / Return Rank: 43
TWEIX Sharpe Ratio Rank: 42
TWEIX Sortino Ratio Rank: 42
TWEIX Omega Ratio Rank: 38
TWEIX Calmar Ratio Rank: 48
TWEIX Martin Ratio Rank: 47

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.

OANMX vs. TWEIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Oakmark Fund Institutional Class (OANMX) and American Century Equity Income Fund (TWEIX). 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.

	OANMX	TWEIX	Difference
Sharpe ratio Return per unit of total volatility	0.55	0.92	-0.37
Sortino ratio Return per unit of downside risk	0.89	1.35	-0.46
Omega ratio Gain probability vs. loss probability	1.13	1.19	-0.06
Calmar ratio Return relative to maximum drawdown	0.84	1.27	-0.43
Martin ratio Return relative to average drawdown	3.34	4.91	-1.57
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

OANMX vs. TWEIX - Sharpe Ratio Comparison

The current OANMX Sharpe Ratio is 0.55, which is lower than the TWEIX Sharpe Ratio of 0.92. The chart below compares the historical Sharpe Ratios of OANMX and TWEIX, 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

	OANMX	TWEIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.55	0.92	-0.37
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.61	0.69	-0.08
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.66	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.59	0.75	-0.16

Correlation

The correlation between OANMX and TWEIX is 0.83, 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

OANMX vs. TWEIX - Dividend Comparison

OANMX's dividend yield for the trailing twelve months is around 1.17%, less than TWEIX's 10.02% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
OANMX Oakmark Fund Institutional Class	1.17%	1.14%	1.34%	1.22%	1.17%	1.94%	0.33%	8.53%	8.37%	0.66%	0.00%	0.00%
TWEIX American Century Equity Income Fund	10.02%	10.35%	11.51%	8.02%	8.76%	6.83%	2.00%	7.38%	8.79%	11.95%	7.88%	10.49%

Drawdowns

OANMX vs. TWEIX - Drawdown Comparison

The maximum OANMX drawdown since its inception was -40.08%, roughly equal to the maximum TWEIX drawdown of -39.30%. Use the drawdown chart below to compare losses from any high point for OANMX and TWEIX.

Drawdown Indicators

	OANMX	TWEIX	Difference
Max Drawdown Largest peak-to-trough decline	-40.08%	-39.30%	-0.78%
Max Drawdown (1Y) Largest decline over 1 year	-13.46%	-8.86%	-4.60%
Max Drawdown (5Y) Largest decline over 5 years	-23.55%	-13.69%	-9.86%
Max Drawdown (10Y) Largest decline over 10 years	—	-32.82%	—
Current Drawdown Current decline from peak	-4.92%	-4.90%	-0.02%
Average Drawdown Average peak-to-trough decline	-5.62%	-4.17%	-1.45%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.37%	2.35%	+1.02%

Volatility

OANMX vs. TWEIX - Volatility Comparison

Oakmark Fund Institutional Class (OANMX) has a higher volatility of 4.20% compared to American Century Equity Income Fund (TWEIX) at 3.04%. This indicates that OANMX's price experiences larger fluctuations and is considered to be riskier than TWEIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	OANMX	TWEIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.20%	3.04%	+1.16%
Volatility (6M) Calculated over the trailing 6-month period	10.34%	6.12%	+4.22%
Volatility (1Y) Calculated over the trailing 1-year period	18.77%	11.60%	+7.17%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.36%	10.71%	+7.65%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.79%	13.35%	+7.44%