COBYX vs. DRESX

Last updated Apr 2, 2026

Compare and contrast key facts about The Cook & Bynum Fund (COBYX) and Driehaus Emerging Markets Small Cap Growth Fund (DRESX).

COBYX is managed by Cook & Bynum. It was launched on Jun 30, 2009. DRESX is managed by Driehaus. It was launched on Aug 21, 2011.

Performance

COBYX vs. DRESX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in The Cook & Bynum Fund (COBYX) and Driehaus Emerging Markets Small Cap Growth Fund (DRESX). The values are adjusted to include any dividend payments, if applicable.

COBYX vs. DRESX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
COBYX The Cook & Bynum Fund	3.01%	20.50%	-10.32%	16.73%	9.28%	9.05%	-10.97%	9.40%	-13.40%	15.12%
DRESX Driehaus Emerging Markets Small Cap Growth Fund	6.35%	24.08%	14.86%	10.30%	-21.17%	15.93%	33.56%	33.70%	-24.00%	33.30%

Returns By Period

In the year-to-date period, COBYX achieves a 3.01% return, which is significantly lower than DRESX's 6.35% return. Over the past 10 years, COBYX has underperformed DRESX with an annualized return of 3.93%, while DRESX has yielded a comparatively higher 10.12% annualized return.

COBYX

• 1D: 1.85%
• 1M: -3.87%
• YTD: 3.01%
• 6M: 7.66%
• 1Y: 7.10%
• 3Y*: 7.06%
• 5Y*: 7.72%
• 10Y*: 3.93%

DRESX

• 1D: 1.41%
• 1M: -8.20%
• YTD: 6.35%
• 6M: 9.70%
• 1Y: 37.67%
• 3Y*: 17.18%
• 5Y*: 8.06%
• 10Y*: 10.12%

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

COBYX vs. DRESX - Expense Ratio Comparison

COBYX has a 1.49% expense ratio, which is higher than DRESX's 1.24% expense ratio.

COBYX

The Cook & Bynum Fund

DRESX

Driehaus Emerging Markets Small Cap Growth Fund

Return for Risk

COBYX vs. DRESX — Risk / Return Rank

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

COBYX

COBYX Risk / Return Rank: 24
COBYX Sharpe Ratio Rank: 21
COBYX Sortino Ratio Rank: 19
COBYX Omega Ratio Rank: 20
COBYX Calmar Ratio Rank: 34
COBYX Martin Ratio Rank: 25

DRESX

DRESX Risk / Return Rank: 95
DRESX Sharpe Ratio Rank: 97
DRESX Sortino Ratio Rank: 96
DRESX Omega Ratio Rank: 93
DRESX Calmar Ratio Rank: 95
DRESX Martin Ratio Rank: 94

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.

COBYX vs. DRESX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for The Cook & Bynum Fund (COBYX) and Driehaus Emerging Markets Small Cap Growth Fund (DRESX). 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.

	COBYX	DRESX	Difference
Sharpe ratio Return per unit of total volatility	0.62	2.55	-1.93
Sortino ratio Return per unit of downside risk	0.92	3.34	-2.42
Omega ratio Gain probability vs. loss probability	1.14	1.47	-0.34
Calmar ratio Return relative to maximum drawdown	1.05	3.56	-2.51
Martin ratio Return relative to average drawdown	3.15	12.73	-9.58
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

COBYX vs. DRESX - Sharpe Ratio Comparison

The current COBYX Sharpe Ratio is 0.62, which is lower than the DRESX Sharpe Ratio of 2.55. The chart below compares the historical Sharpe Ratios of COBYX and DRESX, 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

	COBYX	DRESX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.62	2.55	-1.93
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.56	0.56	0.00
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.29	0.65	-0.36
Sharpe Ratio (All Time) Calculated using the full available price history	0.35	0.54	-0.19

Correlation

The correlation between COBYX and DRESX is 0.39, which is considered to be low. This implies their price changes are not closely related. A low correlation is generally favorable for portfolio diversification, as it helps to reduce overall risk by spreading it across multiple assets with different performance patterns.

Dividends

COBYX vs. DRESX - Dividend Comparison

COBYX's dividend yield for the trailing twelve months is around 1.14%, less than DRESX's 2.11% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
COBYX The Cook & Bynum Fund	1.14%	1.18%	0.00%	1.01%	1.16%	2.18%	0.32%	0.69%	12.60%	1.88%	5.09%
DRESX Driehaus Emerging Markets Small Cap Growth Fund	2.11%	2.25%	0.68%	1.09%	0.00%	0.04%	0.65%	0.41%	0.00%	0.00%	0.00%

Drawdowns

COBYX vs. DRESX - Drawdown Comparison

The maximum COBYX drawdown since its inception was -34.18%, roughly equal to the maximum DRESX drawdown of -33.38%. Use the drawdown chart below to compare losses from any high point for COBYX and DRESX.

Drawdown Indicators

	COBYX	DRESX	Difference
Max Drawdown Largest peak-to-trough decline	-34.18%	-33.38%	-0.80%
Max Drawdown (1Y) Largest decline over 1 year	-8.95%	-10.16%	+1.21%
Max Drawdown (5Y) Largest decline over 5 years	-17.10%	-25.88%	+8.78%
Max Drawdown (10Y) Largest decline over 10 years	-34.18%	-33.38%	-0.80%
Current Drawdown Current decline from peak	-6.21%	-8.89%	+2.68%
Average Drawdown Average peak-to-trough decline	-6.86%	-9.99%	+3.13%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.99%	2.84%	+0.15%

Volatility

COBYX vs. DRESX - Volatility Comparison

The current volatility for The Cook & Bynum Fund (COBYX) is 5.20%, while Driehaus Emerging Markets Small Cap Growth Fund (DRESX) has a volatility of 6.89%. This indicates that COBYX experiences smaller price fluctuations and is considered to be less risky than DRESX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	COBYX	DRESX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.20%	6.89%	-1.69%
Volatility (6M) Calculated over the trailing 6-month period	8.42%	11.15%	-2.73%
Volatility (1Y) Calculated over the trailing 1-year period	14.59%	15.29%	-0.70%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	13.98%	14.43%	-0.45%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	13.55%	15.68%	-2.13%