OAKMX vs. RSP

Last updated Jun 13, 2026

OAKMX (Oakmark Fund Investor Class) and RSP (Invesco S&P 500 Equal Weight ETF) are both funds - OAKMX is a Large Cap Value Equities fund managed by Oakmark, while RSP is a S&P 500 fund tracking the S&P 500 Equal Weight Index. Over the past 10 years, OAKMX returned 13.52%/yr vs 12.15%/yr for RSP. Their correlation of 0.93 suggests significant overlap in exposure. OAKMX charges 0.91%/yr vs 0.20%/yr for RSP.

Performance

OAKMX vs. RSP - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Oakmark Fund Investor Class (OAKMX) and Invesco S&P 500 Equal Weight ETF (RSP). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, OAKMX achieves a -1.16% return, which is significantly lower than RSP's 10.96% return. Over the past 10 years, OAKMX has outperformed RSP with an annualized return of 13.52%, while RSP has yielded a comparatively lower 12.15% annualized return.

OAKMX

• 1D: 0.57%
• 1M: 1.33%
• YTD: -1.16%
• 6M: -1.64%
• 1Y: 10.14%
• 3Y*: 14.13%
• 5Y*: 9.52%
• 10Y*: 13.52%

RSP

• 1D: 0.91%
• 1M: 3.92%
• YTD: 10.96%
• 6M: 10.34%
• 1Y: 21.34%
• 3Y*: 14.66%
• 5Y*: 8.59%
• 10Y*: 12.15%

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

OAKMX vs. RSP - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
OAKMX Oakmark Fund Investor Class	-1.16%	14.13%	16.02%	30.92%	-13.38%	34.85%	12.90%	27.14%	-12.76%	21.12%
RSP Invesco S&P 500 Equal Weight ETF	10.96%	11.21%	12.79%	13.70%	-11.62%	29.41%	12.66%	28.91%	-7.84%	18.52%

Correlation

The correlation between OAKMX and RSP is 0.85, 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	0.85
Correlation (3Y) Calculated over the trailing 3-year period	0.89
Correlation (5Y) Calculated over the trailing 5-year period	0.92
Correlation (10Y) Calculated over the trailing 10-year period	0.92
Correlation (All Time) Calculated using the full available price history since Apr 30, 2003	0.93

The correlation between OAKMX and RSP has been stable across timeframes, ranging from 0.85 to 0.93 - a consistent structural relationship.

Return for Risk

OAKMX vs. RSP — Risk / Return Rank

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

OAKMX

OAKMX Risk / Return Rank: 14
OAKMX Sharpe Ratio Rank: 12
OAKMX Sortino Ratio Rank: 13
OAKMX Omega Ratio Rank: 12
OAKMX Calmar Ratio Rank: 20
OAKMX Martin Ratio Rank: 15

RSP

RSP Risk / Return Rank: 58
RSP Sharpe Ratio Rank: 57
RSP Sortino Ratio Rank: 59
RSP Omega Ratio Rank: 54
RSP Calmar Ratio Rank: 59
RSP Martin Ratio Rank: 62

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.

OAKMX vs. RSP - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Oakmark Fund Investor Class (OAKMX) and Invesco S&P 500 Equal Weight ETF (RSP). 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.

	OAKMX	RSP	Difference
Sharpe ratio: Return per unit of total volatility	0.68	1.69	-1.01
Sortino ratio: Return per unit of downside risk	1.05	2.44	-1.39
Omega ratio: Gain probability vs. loss probability	1.13	1.29	-0.17
Calmar ratio: Return relative to maximum drawdown	1.27	2.54	-1.27
Martin ratio: Return relative to average drawdown	3.18	9.63	-6.45

OAKMX vs. RSP - Sharpe Ratio Comparison

The current OAKMX Sharpe Ratio is 0.68, which is lower than the RSP Sharpe Ratio of 1.69. The chart below compares the historical Sharpe Ratios of OAKMX and RSP, 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

OAKMX vs. RSP - Drawdown Comparison

The maximum OAKMX drawdown since its inception was -56.19%, smaller than the maximum RSP drawdown of -59.92%. Use the drawdown chart below to compare losses from any high point for OAKMX and RSP.

Drawdown Indicators

	OAKMX	RSP	Difference
Max Drawdown Largest peak-to-trough decline	-56.19%	-59.92%	+3.73%
Max Drawdown (1Y) Largest decline over 1 year	-6.98%	-7.85%	+0.87%
Max Drawdown (3Y) Largest decline over 3 years	-17.05%	-17.81%	+0.76%
Max Drawdown (5Y) Largest decline over 5 years	-23.68%	-21.38%	-2.30%
Max Drawdown (10Y) Largest decline over 10 years	-41.43%	-39.04%	-2.39%
Current Drawdown Current decline from peak	-3.69%	0.00%	-3.69%
Average Drawdown Average peak-to-trough decline	-6.39%	-6.64%	+0.25%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.79%	2.07%	+0.72%

Volatility

OAKMX vs. RSP - Volatility Comparison

Oakmark Fund Investor Class (OAKMX) and Invesco S&P 500 Equal Weight ETF (RSP) have volatilities of 3.66% and 3.57%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	OAKMX	RSP	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.66%	3.57%	+0.09%
Volatility (6M) Calculated over the trailing 6-month period	9.57%	8.59%	+0.98%
Volatility (1Y) Calculated over the trailing 1-year period	13.13%	11.83%	+1.30%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.32%	16.22%	+2.10%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.40%	18.36%	+2.04%

OAKMX vs. RSP - Expense Ratio Comparison

OAKMX has a 0.91% expense ratio, which is higher than RSP's 0.20% expense ratio.

Dividends

OAKMX vs. RSP - Dividend Comparison

OAKMX's dividend yield for the trailing twelve months is around 0.93%, less than RSP's 1.47% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
OAKMX Oakmark Fund Investor Class	0.93%	0.92%	1.12%	1.02%	0.92%	1.94%	0.17%	8.33%	8.13%	4.06%	2.58%	1.43%
RSP Invesco S&P 500 Equal Weight ETF	1.47%	1.64%	1.52%	1.64%	1.82%	1.28%	1.64%	1.69%	2.02%	1.52%	1.20%	1.70%

Frequently Asked Questions

Can I hold both OAKMX and RSP in my portfolio?

OAKMX and RSP have a correlation of 0.85, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, OAKMX or RSP?

OAKMX has higher volatility (3.66%) compared to RSP (3.57%). In terms of maximum drawdown, OAKMX dropped -56.19% vs RSP's -59.92%.

Which has better risk-adjusted returns?

RSP currently has the higher Sharpe Ratio (1.69 vs 0.68), 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.