MFSSX vs. MIEIX

Last updated Jun 4, 2026

MFSSX (MFS Massachusetts Municipal Bond Fund) and MIEIX (MFS International Equity Fund Class R6) are both mutual funds - MFSSX is a Municipal Bonds fund managed by MFS, while MIEIX is a Foreign Large Cap Equities fund managed by MFS. Over the past 10 years, MFSSX returned 1.80%/yr vs 9.82%/yr for MIEIX. At a correlation of -0.05, they often move in opposite directions. MFSSX charges 0.83%/yr vs 0.68%/yr for MIEIX.

Performance

MFSSX vs. MIEIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Massachusetts Municipal Bond Fund (MFSSX) and MFS International Equity Fund Class R6 (MIEIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MFSSX achieves a 1.86% return, which is significantly lower than MIEIX's 3.25% return. Over the past 10 years, MFSSX has underperformed MIEIX with an annualized return of 1.80%, while MIEIX has yielded a comparatively higher 9.82% annualized return.

MFSSX

• 1D: 0.20%
• 1M: 0.77%
• YTD: 1.86%
• 6M: 2.24%
• 1Y: 7.54%
• 3Y*: 3.76%
• 5Y*: 0.48%
• 10Y*: 1.80%

MIEIX

• 1D: 0.17%
• 1M: 3.66%
• YTD: 3.25%
• 6M: 5.80%
• 1Y: 10.30%
• 3Y*: 12.08%
• 5Y*: 7.26%
• 10Y*: 9.82%

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

MFSSX vs. MIEIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MFSSX MFS Massachusetts Municipal Bond Fund	1.86%	4.04%	1.94%	5.59%	-10.79%	2.02%	3.71%	7.56%	0.77%	4.86%
MIEIX MFS International Equity Fund Class R6	3.25%	23.22%	4.13%	19.06%	-14.82%	15.13%	11.11%	28.42%	-10.66%	28.01%

Correlation

The correlation between MFSSX and MIEIX is 0.34, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.34
Correlation (3Y) Calculated over the trailing 3-year period	0.23
Correlation (5Y) Calculated over the trailing 5-year period	0.19
Correlation (10Y) Calculated over the trailing 10-year period	0.07
Correlation (All Time) Calculated using the full available price history since Jan 31, 1996	-0.05

The correlation between MFSSX and MIEIX shifts across timeframes, from -0.05 (all time) to 0.34 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

MFSSX vs. MIEIX — Risk / Return Rank

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

MFSSX

MFSSX Risk / Return Rank: 71
MFSSX Sharpe Ratio Rank: 79
MFSSX Sortino Ratio Rank: 85
MFSSX Omega Ratio Rank: 90
MFSSX Calmar Ratio Rank: 52
MFSSX Martin Ratio Rank: 48

MIEIX

MIEIX Risk / Return Rank: 9
MIEIX Sharpe Ratio Rank: 9
MIEIX Sortino Ratio Rank: 9
MIEIX Omega Ratio Rank: 9
MIEIX Calmar Ratio Rank: 8
MIEIX Martin Ratio Rank: 10

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.

MFSSX vs. MIEIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Massachusetts Municipal Bond Fund (MFSSX) and MFS International Equity Fund Class R6 (MIEIX). 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.

	MFSSX	MIEIX	Difference
Sharpe ratio: Return per unit of total volatility	2.59	0.73	+1.86
Sortino ratio: Return per unit of downside risk	4.10	1.11	+2.99
Omega ratio: Gain probability vs. loss probability	1.66	1.14	+0.52
Calmar ratio: Return relative to maximum drawdown	2.74	0.85	+1.89
Martin ratio: Return relative to average drawdown	9.87	3.00	+6.88
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MFSSX vs. MIEIX - Sharpe Ratio Comparison

The current MFSSX Sharpe Ratio is 2.59, which is higher than the MIEIX Sharpe Ratio of 0.73. The chart below compares the historical Sharpe Ratios of MFSSX and MIEIX, 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

	MFSSX	MIEIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.59	0.73	+1.86
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.11	0.48	-0.36
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.42	0.62	-0.20
Sharpe Ratio (All Time) Calculated using the full available price history	1.11	0.46	+0.65

Drawdowns

MFSSX vs. MIEIX - Drawdown Comparison

The maximum MFSSX drawdown since its inception was -17.05%, smaller than the maximum MIEIX drawdown of -53.13%. Use the drawdown chart below to compare losses from any high point for MFSSX and MIEIX.

Drawdown Indicators

	MFSSX	MIEIX	Difference
Max Drawdown Largest peak-to-trough decline	-17.05%	-53.13%	+36.08%
Max Drawdown (1Y) Largest decline over 1 year	-2.72%	-11.26%	+8.54%
Max Drawdown (3Y) Largest decline over 3 years	-6.64%	-13.43%	+6.79%
Max Drawdown (5Y) Largest decline over 5 years	-16.13%	-28.07%	+11.94%
Max Drawdown (10Y) Largest decline over 10 years	-16.13%	-31.35%	+15.22%
Current Drawdown Current decline from peak	-0.05%	-1.48%	+1.43%
Average Drawdown Average peak-to-trough decline	-2.40%	-8.98%	+6.58%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.75%	3.19%	-2.44%

Volatility

MFSSX vs. MIEIX - Volatility Comparison

The current volatility for MFS Massachusetts Municipal Bond Fund (MFSSX) is 1.14%, while MFS International Equity Fund Class R6 (MIEIX) has a volatility of 3.45%. This indicates that MFSSX experiences smaller price fluctuations and is considered to be less risky than MIEIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MFSSX	MIEIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.14%	3.45%	-2.31%
Volatility (6M) Calculated over the trailing 6-month period	2.15%	10.21%	-8.06%
Volatility (1Y) Calculated over the trailing 1-year period	2.90%	13.17%	-10.27%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.23%	15.34%	-11.11%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.35%	15.94%	-11.59%

MFSSX vs. MIEIX - Expense Ratio Comparison

MFSSX has a 0.83% expense ratio, which is higher than MIEIX's 0.68% expense ratio.

Dividends

MFSSX vs. MIEIX - Dividend Comparison

MFSSX's dividend yield for the trailing twelve months is around 3.22%, more than MIEIX's 2.59% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MFSSX MFS Massachusetts Municipal Bond Fund	3.22%	4.20%	2.81%	2.43%	1.84%	1.91%	2.44%	3.27%	3.42%	3.74%	3.64%	3.70%
MIEIX MFS International Equity Fund Class R6	2.59%	2.68%	1.47%	1.67%	1.26%	5.40%	1.00%	3.12%	1.63%	1.85%	1.78%	1.71%

Frequently Asked Questions

Can I hold both MFSSX and MIEIX in my portfolio?

MFSSX and MIEIX have a correlation of 0.34, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MFSSX or MIEIX?

MIEIX has higher volatility (3.45%) compared to MFSSX (1.14%). In terms of maximum drawdown, MFSSX dropped -17.05% vs MIEIX's -53.13%.

Which has better risk-adjusted returns?

MFSSX currently has the higher Sharpe Ratio (2.59 vs 0.73), 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.