MEMAX vs. SSKEX

Last updated Jun 3, 2026

MEMAX (MFS Emerging Markets Equity Fund) and SSKEX (State Street Emerging Markets Equity Index Fund) are both Emerging Markets Diversified funds. Over the past 10 years, MEMAX returned 9.26%/yr vs 10.49%/yr for SSKEX. Their correlation of 0.93 suggests significant overlap in exposure. MEMAX charges 1.31%/yr vs 0.17%/yr for SSKEX.

Performance

MEMAX vs. SSKEX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Emerging Markets Equity Fund (MEMAX) 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, MEMAX achieves a 20.70% return, which is significantly lower than SSKEX's 27.76% return. Over the past 10 years, MEMAX has underperformed SSKEX with an annualized return of 9.26%, while SSKEX has yielded a comparatively higher 10.49% annualized return.

MEMAX

• 1D: 1.78%
• 1M: 9.03%
• YTD: 20.70%
• 6M: 22.49%
• 1Y: 46.26%
• 3Y*: 22.64%
• 5Y*: 6.46%
• 10Y*: 9.26%

SSKEX

• 1D: 1.27%
• 1M: 9.52%
• YTD: 27.76%
• 6M: 30.90%
• 1Y: 56.51%
• 3Y*: 24.33%
• 5Y*: 7.51%
• 10Y*: 10.49%

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

MEMAX vs. SSKEX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MEMAX MFS Emerging Markets Equity Fund	20.70%	33.44%	10.96%	10.89%	-20.10%	-6.98%	10.17%	19.81%	-14.02%	37.38%
SSKEX State Street Emerging Markets Equity Index Fund	27.76%	33.79%	7.00%	9.50%	-20.23%	-2.80%	18.20%	18.16%	-14.78%	37.18%

Correlation

The correlation between MEMAX and SSKEX is 0.89, 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	0.89
Correlation (3Y) Calculated over the trailing 3-year period	0.91
Correlation (5Y) Calculated over the trailing 5-year period	0.92
Correlation (10Y) Calculated over the trailing 10-year period	0.93
Correlation (All Time) Calculated using the full available price history since Jan 5, 2016	0.93

The correlation between MEMAX and SSKEX has been stable across timeframes, ranging from 0.89 to 0.93 - a consistent structural relationship.

Return for Risk

MEMAX vs. SSKEX — Risk / Return Rank

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

MEMAX

MEMAX Risk / Return Rank: 85
MEMAX Sharpe Ratio Rank: 93
MEMAX Sortino Ratio Rank: 88
MEMAX Omega Ratio Rank: 85
MEMAX Calmar Ratio Rank: 81
MEMAX Martin Ratio Rank: 77

SSKEX

SSKEX Risk / Return Rank: 91
SSKEX Sharpe Ratio Rank: 96
SSKEX Sortino Ratio Rank: 91
SSKEX Omega Ratio Rank: 90
SSKEX Calmar Ratio Rank: 89
SSKEX Martin Ratio Rank: 87

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.

MEMAX vs. SSKEX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Emerging Markets Equity Fund (MEMAX) 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.

	MEMAX	SSKEX	Difference
Sharpe ratio Return per unit of total volatility	3.16	3.51	-0.35
Sortino ratio Return per unit of downside risk	4.21	4.50	-0.30
Omega ratio Gain probability vs. loss probability	1.58	1.65	-0.07
Calmar ratio Return relative to maximum drawdown	3.71	4.50	-0.79
Martin ratio Return relative to average drawdown	14.58	16.98	-2.40
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MEMAX vs. SSKEX - Sharpe Ratio Comparison

The current MEMAX Sharpe Ratio is 3.16, which is comparable to the SSKEX Sharpe Ratio of 3.51. The chart below compares the historical Sharpe Ratios of MEMAX 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

	MEMAX	SSKEX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.16	3.51	-0.35
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.41	0.46	-0.05
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.56	0.61	-0.05
Sharpe Ratio (All Time) Calculated using the full available price history	0.33	0.62	-0.29

Drawdowns

MEMAX vs. SSKEX - Drawdown Comparison

The maximum MEMAX drawdown since its inception was -67.04%, which is greater than SSKEX's maximum drawdown of -39.23%. Use the drawdown chart below to compare losses from any high point for MEMAX and SSKEX.

Drawdown Indicators

	MEMAX	SSKEX	Difference
Max Drawdown Largest peak-to-trough decline	-67.04%	-39.23%	-27.81%
Max Drawdown (1Y) Largest decline over 1 year	-12.27%	-12.44%	+0.17%
Max Drawdown (3Y) Largest decline over 3 years	-14.48%	-16.09%	+1.61%
Max Drawdown (5Y) Largest decline over 5 years	-40.94%	-37.04%	-3.90%
Max Drawdown (10Y) Largest decline over 10 years	-42.32%	-39.23%	-3.09%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-19.69%	-13.28%	-6.41%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.12%	3.29%	-0.17%

Volatility

MEMAX vs. SSKEX - Volatility Comparison

The current volatility for MFS Emerging Markets Equity Fund (MEMAX) is 6.16%, while State Street Emerging Markets Equity Index Fund (SSKEX) has a volatility of 6.68%. This indicates that MEMAX 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

	MEMAX	SSKEX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.16%	6.68%	-0.52%
Volatility (6M) Calculated over the trailing 6-month period	12.37%	14.02%	-1.65%
Volatility (1Y) Calculated over the trailing 1-year period	14.96%	16.48%	-1.52%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.02%	16.49%	-0.47%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.67%	17.29%	-0.62%

MEMAX vs. SSKEX - Expense Ratio Comparison

MEMAX has a 1.31% expense ratio, which is higher than SSKEX's 0.17% expense ratio.

Dividends

MEMAX vs. SSKEX - Dividend Comparison

MEMAX's dividend yield for the trailing twelve months is around 2.05%, less than SSKEX's 2.23% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MEMAX MFS Emerging Markets Equity Fund	2.05%	2.47%	2.41%	2.48%	0.99%	1.97%	0.53%	1.64%	0.47%	0.09%	0.54%	0.14%
SSKEX State Street Emerging Markets Equity Index Fund	2.23%	2.85%	2.90%	3.26%	3.90%	1.95%	1.84%	2.84%	3.01%	2.55%	2.29%	0.00%

Frequently Asked Questions

Can I hold both MEMAX and SSKEX in my portfolio?

MEMAX and SSKEX have a correlation of 0.89, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MEMAX or SSKEX?

SSKEX has higher volatility (6.68%) compared to MEMAX (6.16%). In terms of maximum drawdown, MEMAX dropped -67.04% vs SSKEX's -39.23%.

Which has better risk-adjusted returns?

SSKEX currently has the higher Sharpe Ratio (3.51 vs 3.16), 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.