THOPX vs. OAKBX

Last updated Jun 6, 2026

THOPX (Thompson Bond Fund) and OAKBX (Oakmark Equity and Income Fund) are both mutual funds - THOPX is a Short-Term Bond fund managed by Thompson IM, while OAKBX is a Diversified Portfolio fund managed by Oakmark. Over the past 10 years, THOPX returned 4.10%/yr vs 9.00%/yr for OAKBX. At a 0.07 correlation, their price movements are largely independent. THOPX charges 0.71%/yr vs 0.83%/yr for OAKBX.

Performance

THOPX vs. OAKBX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Thompson Bond Fund (THOPX) and Oakmark Equity and Income Fund (OAKBX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both investments are quite close, with THOPX having a 0.95% return and OAKBX slightly higher at 0.96%. Over the past 10 years, THOPX has underperformed OAKBX with an annualized return of 4.10%, while OAKBX has yielded a comparatively higher 9.00% annualized return.

THOPX

• 1D: 0.19%
• 1M: -0.09%
• YTD: 0.95%
• 6M: 1.41%
• 1Y: 6.04%
• 3Y*: 8.90%
• 5Y*: 4.03%
• 10Y*: 4.10%

OAKBX

• 1D: 1.01%
• 1M: 0.38%
• YTD: 0.96%
• 6M: 2.49%
• 1Y: 10.19%
• 3Y*: 10.95%
• 5Y*: 6.15%
• 10Y*: 9.00%

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

THOPX vs. OAKBX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
THOPX Thompson Bond Fund	0.95%	7.98%	11.54%	6.98%	-7.28%	5.75%	-1.71%	5.56%	1.80%	4.75%
OAKBX Oakmark Equity and Income Fund	0.96%	11.05%	8.73%	17.39%	-12.94%	29.12%	8.68%	19.39%	-8.38%	14.43%

Correlation

The correlation between THOPX and OAKBX is 0.32, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.32
Correlation (3Y) Calculated over the trailing 3-year period	0.32
Correlation (5Y) Calculated over the trailing 5-year period	0.25
Correlation (10Y) Calculated over the trailing 10-year period	0.19
Correlation (All Time) Calculated using the full available price history since Nov 1, 1995	0.07

Over the past year, THOPX and OAKBX have become more correlated (0.32) than their long-term average of 0.07, meaning their price movements have been converging.

Return for Risk

THOPX vs. OAKBX — Risk / Return Rank

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

THOPX

THOPX Risk / Return Rank: 91
THOPX Sharpe Ratio Rank: 93
THOPX Sortino Ratio Rank: 94
THOPX Omega Ratio Rank: 92
THOPX Calmar Ratio Rank: 87
THOPX Martin Ratio Rank: 88

OAKBX

OAKBX Risk / Return Rank: 19
OAKBX Sharpe Ratio Rank: 18
OAKBX Sortino Ratio Rank: 19
OAKBX Omega Ratio Rank: 18
OAKBX Calmar Ratio Rank: 19
OAKBX Martin Ratio Rank: 19

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.

THOPX vs. OAKBX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Thompson Bond Fund (THOPX) and Oakmark Equity and Income Fund (OAKBX). 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.

	THOPX	OAKBX	Difference
Sharpe ratio: Return per unit of total volatility	3.15	1.17	+1.97
Sortino ratio: Return per unit of downside risk	4.78	1.76	+3.02
Omega ratio: Gain probability vs. loss probability	1.70	1.21	+0.49
Calmar ratio: Return relative to maximum drawdown	4.09	1.47	+2.61
Martin ratio: Return relative to average drawdown	16.54	4.81	+11.73
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

THOPX vs. OAKBX - Sharpe Ratio Comparison

The current THOPX Sharpe Ratio is 3.15, which is higher than the OAKBX Sharpe Ratio of 1.17. The chart below compares the historical Sharpe Ratios of THOPX and OAKBX, 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

	THOPX	OAKBX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.15	1.17	+1.97
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	1.86	0.51	+1.36
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	1.86	0.69	+1.17
Sharpe Ratio (All Time) Calculated using the full available price history	1.25	0.86	+0.40

Drawdowns

THOPX vs. OAKBX - Drawdown Comparison

The maximum THOPX drawdown since its inception was -19.45%, smaller than the maximum OAKBX drawdown of -31.31%. Use the drawdown chart below to compare losses from any high point for THOPX and OAKBX.

Drawdown Indicators

	THOPX	OAKBX	Difference
Max Drawdown Largest peak-to-trough decline	-19.45%	-31.31%	+11.86%
Max Drawdown (1Y) Largest decline over 1 year	-1.48%	-6.90%	+5.42%
Max Drawdown (3Y) Largest decline over 3 years	-1.61%	-10.91%	+9.30%
Max Drawdown (5Y) Largest decline over 5 years	-8.00%	-20.41%	+12.41%
Max Drawdown (10Y) Largest decline over 10 years	-11.74%	-30.19%	+18.45%
Current Drawdown Current decline from peak	-0.36%	-1.05%	+0.69%
Average Drawdown Average peak-to-trough decline	-1.86%	-3.77%	+1.91%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.37%	2.11%	-1.74%

Volatility

THOPX vs. OAKBX - Volatility Comparison

The current volatility for Thompson Bond Fund (THOPX) is 0.87%, while Oakmark Equity and Income Fund (OAKBX) has a volatility of 2.56%. This indicates that THOPX experiences smaller price fluctuations and is considered to be less risky than OAKBX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	THOPX	OAKBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.87%	2.56%	-1.69%
Volatility (6M) Calculated over the trailing 6-month period	1.60%	6.38%	-4.78%
Volatility (1Y) Calculated over the trailing 1-year period	1.93%	8.67%	-6.74%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	2.17%	12.14%	-9.97%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	2.21%	13.05%	-10.84%

THOPX vs. OAKBX - Expense Ratio Comparison

THOPX has a 0.71% expense ratio, which is lower than OAKBX's 0.83% expense ratio.

Dividends

THOPX vs. OAKBX - Dividend Comparison

THOPX's dividend yield for the trailing twelve months is around 5.11%, more than OAKBX's 2.19% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
OAKBX Oakmark Equity and Income Fund	2.19%	2.16%	2.05%	2.28%	1.44%	14.26%	4.17%	9.07%	10.05%	8.09%	4.13%	6.53%
THOPX Thompson Bond Fund	5.11%	4.90%	5.34%	5.88%	3.93%	3.59%	5.16%	3.48%	3.07%	3.06%	4.24%	4.58%

Frequently Asked Questions

Can I hold both THOPX and OAKBX in my portfolio?

THOPX and OAKBX have a correlation of 0.32, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, THOPX or OAKBX?

OAKBX has higher volatility (2.56%) compared to THOPX (0.87%). In terms of maximum drawdown, THOPX dropped -19.45% vs OAKBX's -31.31%.

Which has better risk-adjusted returns?

THOPX currently has the higher Sharpe Ratio (3.15 vs 1.17), 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.