EEMIX vs. SSKEX

Last updated Jun 4, 2026

EEMIX (MFS Emerging Markets Equity Research Fund) and SSKEX (State Street Emerging Markets Equity Index Fund) are both Emerging Markets Diversified funds. Over the past 5 years, EEMIX returned 7.29%/yr vs 7.79%/yr for SSKEX. Their correlation of 0.92 suggests significant overlap in exposure. EEMIX charges 1.00%/yr vs 0.17%/yr for SSKEX.

Performance

EEMIX vs. SSKEX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Emerging Markets Equity Research Fund (EEMIX) and State Street Emerging Markets Equity Index Fund (SSKEX). 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 lower than SSKEX's 28.95% return.

EEMIX

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

SSKEX

• 1D: 0.94%
• 1M: 8.80%
• YTD: 28.95%
• 6M: 32.16%
• 1Y: 57.79%
• 3Y*: 24.72%
• 5Y*: 7.79%
• 10Y*: 10.59%

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

EEMIX vs. SSKEX - 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%
SSKEX State Street Emerging Markets Equity Index Fund	28.95%	33.79%	7.00%	9.50%	-20.23%	-4.14%

Correlation

The correlation between EEMIX and SSKEX is 0.90, 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	0.90
Correlation (3Y) Calculated over the trailing 3-year period	0.91
Correlation (5Y) Calculated over the trailing 5-year period	0.92
Correlation (All Time) Calculated using the full available price history since Mar 9, 2021	0.92

The correlation between EEMIX and SSKEX has been stable across timeframes, ranging from 0.90 to 0.92 - a consistent structural relationship.

Return for Risk

EEMIX vs. SSKEX — 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

SSKEX

SSKEX Risk / Return Rank: 92
SSKEX Sharpe Ratio Rank: 96
SSKEX Sortino Ratio Rank: 92
SSKEX Omega Ratio Rank: 91
SSKEX Calmar Ratio Rank: 90
SSKEX Martin Ratio Rank: 89

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. SSKEX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Emerging Markets Equity Research Fund (EEMIX) and State Street Emerging Markets Equity Index Fund (SSKEX). 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	SSKEX	Difference
Sharpe ratio: Return per unit of total volatility	3.36	3.54	-0.18
Sortino ratio: Return per unit of downside risk	4.40	4.54	-0.14
Omega ratio: Gain probability vs. loss probability	1.61	1.66	-0.05
Calmar ratio: Return relative to maximum drawdown	4.39	4.68	-0.30
Martin ratio: Return relative to average drawdown	17.00	17.65	-0.65
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. SSKEX - Sharpe Ratio Comparison

The current EEMIX Sharpe Ratio is 3.36, which is comparable to the SSKEX Sharpe Ratio of 3.54. The chart below compares the historical Sharpe Ratios of EEMIX and SSKEX, 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	SSKEX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.36	3.54	-0.18
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.46	0.47	-0.01
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.61	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.51	0.63	-0.11

Drawdowns

EEMIX vs. SSKEX - Drawdown Comparison

The maximum EEMIX drawdown since its inception was -38.14%, roughly equal to the maximum SSKEX drawdown of -39.23%. Use the drawdown chart below to compare losses from any high point for EEMIX and SSKEX.

Drawdown Indicators

	EEMIX	SSKEX	Difference
Max Drawdown Largest peak-to-trough decline	-38.14%	-39.23%	+1.09%
Max Drawdown (1Y) Largest decline over 1 year	-12.28%	-12.44%	+0.16%
Max Drawdown (3Y) Largest decline over 3 years	-16.69%	-16.09%	-0.60%
Max Drawdown (5Y) Largest decline over 5 years	-38.01%	-37.04%	-0.97%
Max Drawdown (10Y) Largest decline over 10 years	—	-39.23%	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-14.29%	-13.27%	-1.02%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.16%	3.29%	-0.13%

Volatility

EEMIX vs. SSKEX - Volatility Comparison

The current volatility for MFS Emerging Markets Equity Research Fund (EEMIX) is 6.24%, while State Street Emerging Markets Equity Index Fund (SSKEX) has a volatility of 6.69%. This indicates that EEMIX experiences smaller price fluctuations and is considered to be less risky than SSKEX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	EEMIX	SSKEX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.24%	6.69%	-0.45%
Volatility (6M) Calculated over the trailing 6-month period	13.53%	14.03%	-0.50%
Volatility (1Y) Calculated over the trailing 1-year period	16.02%	16.47%	-0.45%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.93%	16.50%	-0.57%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	15.81%	17.29%	-1.48%

EEMIX vs. SSKEX - Expense Ratio Comparison

EEMIX has a 1.00% expense ratio, which is higher than SSKEX's 0.17% expense ratio.

Dividends

EEMIX vs. SSKEX - Dividend Comparison

EEMIX's dividend yield for the trailing twelve months is around 1.49%, less than SSKEX's 2.21% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
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%
SSKEX State Street Emerging Markets Equity Index Fund	2.21%	2.85%	2.90%	3.26%	3.90%	1.95%	1.84%	2.84%	3.01%	2.55%	2.29%

Frequently Asked Questions

Can I hold both EEMIX and SSKEX in my portfolio?

With a correlation of 0.90, EEMIX and SSKEX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, EEMIX or SSKEX?

SSKEX has higher volatility (6.69%) compared to EEMIX (6.24%). In terms of maximum drawdown, EEMIX dropped -38.14% vs SSKEX's -39.23%.

Which has better risk-adjusted returns?

SSKEX currently has the higher Sharpe Ratio (3.54 vs 3.36), 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.