EEMIX vs. COBYX

Last updated Jun 4, 2026

EEMIX (MFS Emerging Markets Equity Research Fund) and COBYX (The Cook & Bynum Fund) are both Emerging Markets Diversified funds. Over the past 5 years, EEMIX returned 7.29%/yr vs 8.13%/yr for COBYX. At a 0.42 correlation, their price movements are largely independent. EEMIX charges 1.00%/yr vs 1.49%/yr for COBYX.

Performance

EEMIX vs. COBYX - Performance Comparison

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

Returns By Period

In the year-to-date period, EEMIX achieves a 27.49% return, which is significantly higher than COBYX's 10.74% return.

EEMIX

• 1D: 1.25%
• 1M: 8.92%
• YTD: 27.49%
• 6M: 29.75%
• 1Y: 53.08%
• 3Y*: 22.39%
• 5Y*: 7.29%
• 10Y*: —

COBYX

• 1D: 0.67%
• 1M: 4.17%
• YTD: 10.74%
• 6M: 13.67%
• 1Y: 14.46%
• 3Y*: 8.98%
• 5Y*: 8.13%
• 10Y*: 4.79%

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

EEMIX vs. COBYX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
EEMIX MFS Emerging Markets Equity Research Fund	27.49%	31.02%	7.32%	9.23%	-22.37%	-1.20%
COBYX The Cook & Bynum Fund	10.74%	20.50%	-10.32%	16.73%	9.28%	4.65%

Correlation

The correlation between EEMIX and COBYX is 0.26, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.26
Correlation (3Y) Calculated over the trailing 3-year period	0.38
Correlation (5Y) Calculated over the trailing 5-year period	0.42
Correlation (All Time) Calculated using the full available price history since Mar 9, 2021	0.42

The correlation between EEMIX and COBYX shifts across timeframes, from 0.26 (1 year) to 0.42 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

EEMIX vs. COBYX — Risk / Return Rank

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

EEMIX

EEMIX Risk / Return Rank: 89
EEMIX Sharpe Ratio Rank: 95
EEMIX Sortino Ratio Rank: 89
EEMIX Omega Ratio Rank: 87
EEMIX Calmar Ratio Rank: 88
EEMIX Martin Ratio Rank: 88

COBYX

COBYX Risk / Return Rank: 19
COBYX Sharpe Ratio Rank: 19
COBYX Sortino Ratio Rank: 20
COBYX Omega Ratio Rank: 18
COBYX Calmar Ratio Rank: 20
COBYX 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.

EEMIX vs. COBYX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Emerging Markets Equity Research Fund (EEMIX) and The Cook & Bynum Fund (COBYX). 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.

	EEMIX	COBYX	Difference
Sharpe ratio: Return per unit of total volatility	3.36	1.23	+2.13
Sortino ratio: Return per unit of downside risk	4.40	1.86	+2.54
Omega ratio: Gain probability vs. loss probability	1.61	1.22	+0.39
Calmar ratio: Return relative to maximum drawdown	4.39	1.62	+2.76
Martin ratio: Return relative to average drawdown	17.00	5.15	+11.85
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

EEMIX vs. COBYX - Sharpe Ratio Comparison

The current EEMIX Sharpe Ratio is 3.36, which is higher than the COBYX Sharpe Ratio of 1.23. The chart below compares the historical Sharpe Ratios of EEMIX and COBYX, 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

	EEMIX	COBYX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.36	1.23	+2.13
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.46	0.59	-0.13
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.35	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.51	0.39	+0.12

Drawdowns

EEMIX vs. COBYX - Drawdown Comparison

The maximum EEMIX drawdown since its inception was -38.14%, which is greater than COBYX's maximum drawdown of -34.18%. Use the drawdown chart below to compare losses from any high point for EEMIX and COBYX.

Drawdown Indicators

	EEMIX	COBYX	Difference
Max Drawdown Largest peak-to-trough decline	-38.14%	-34.18%	-3.96%
Max Drawdown (1Y) Largest decline over 1 year	-12.28%	-8.95%	-3.33%
Max Drawdown (3Y) Largest decline over 3 years	-16.69%	-16.29%	-0.40%
Max Drawdown (5Y) Largest decline over 5 years	-38.01%	-17.10%	-20.91%
Max Drawdown (10Y) Largest decline over 10 years	—	-34.18%	—
Current Drawdown Current decline from peak	0.00%	-1.12%	+1.12%
Average Drawdown Average peak-to-trough decline	-14.29%	-6.80%	-7.49%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.16%	2.99%	+0.17%

Volatility

EEMIX vs. COBYX - Volatility Comparison

MFS Emerging Markets Equity Research Fund (EEMIX) has a higher volatility of 6.24% compared to The Cook & Bynum Fund (COBYX) at 3.75%. This indicates that EEMIX's price experiences larger fluctuations and is considered to be riskier than COBYX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	EEMIX	COBYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.24%	3.75%	+2.49%
Volatility (6M) Calculated over the trailing 6-month period	13.53%	9.46%	+4.07%
Volatility (1Y) Calculated over the trailing 1-year period	16.02%	11.78%	+4.24%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.93%	13.99%	+1.94%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	15.81%	13.64%	+2.17%

EEMIX vs. COBYX - Expense Ratio Comparison

EEMIX has a 1.00% expense ratio, which is lower than COBYX's 1.49% expense ratio.

Dividends

EEMIX vs. COBYX - Dividend Comparison

EEMIX's dividend yield for the trailing twelve months is around 1.49%, more than COBYX's 1.06% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
COBYX The Cook & Bynum Fund	1.06%	1.18%	0.00%	1.01%	1.16%	2.18%	0.32%	0.69%	12.60%	1.88%	5.09%
EEMIX MFS Emerging Markets Equity Research Fund	1.49%	1.90%	1.47%	3.00%	1.19%	0.85%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both EEMIX and COBYX in my portfolio?

EEMIX and COBYX have a correlation of 0.26, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, EEMIX or COBYX?

EEMIX has higher volatility (6.24%) compared to COBYX (3.75%). In terms of maximum drawdown, EEMIX dropped -38.14% vs COBYX's -34.18%.

Which has better risk-adjusted returns?

EEMIX currently has the higher Sharpe Ratio (3.36 vs 1.23), 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.