MEDIX vs. MRSIX

Last updated Jun 24, 2026

MEDIX (MFS Emerging Markets Debt Fund) and MRSIX (MFS Research International Fund) are both mutual funds - MEDIX is a Emerging Markets Bonds fund managed by MFS, while MRSIX is a Foreign Large Cap Equities fund managed by MFS. Over the past 10 years, MEDIX returned 3.66%/yr vs 9.53%/yr for MRSIX. At a 0.36 correlation, their price movements are largely independent. MEDIX charges 0.81%/yr vs 0.76%/yr for MRSIX.

Performance

MEDIX vs. MRSIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Emerging Markets Debt Fund (MEDIX) and MFS Research International Fund (MRSIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MEDIX achieves a 2.54% return, which is significantly lower than MRSIX's 10.64% return. Over the past 10 years, MEDIX has underperformed MRSIX with an annualized return of 3.66%, while MRSIX has yielded a comparatively higher 9.53% annualized return.

MEDIX

• 1D: -0.23%
• 1M: 1.57%
• YTD: 2.54%
• 6M: 3.17%
• 1Y: 11.37%
• 3Y*: 9.00%
• 5Y*: 2.08%
• 10Y*: 3.66%

MRSIX

• 1D: 0.00%
• 1M: 2.46%
• YTD: 10.64%
• 6M: 10.35%
• 1Y: 20.07%
• 3Y*: 13.61%
• 5Y*: 6.35%
• 10Y*: 9.53%

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

MEDIX vs. MRSIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MEDIX MFS Emerging Markets Debt Fund	2.54%	12.48%	5.92%	9.42%	-15.97%	-2.40%	8.01%	14.12%	-4.99%	9.64%
MRSIX MFS Research International Fund	10.64%	22.61%	3.06%	13.44%	-17.33%	11.87%	13.18%	27.98%	-13.98%	28.38%

Correlation

The correlation between MEDIX and MRSIX is 0.52, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.52
Correlation (3Y) Calculated over the trailing 3-year period	0.43
Correlation (5Y) Calculated over the trailing 5-year period	0.44
Correlation (10Y) Calculated over the trailing 10-year period	0.39
Correlation (All Time) Calculated using the full available price history since Mar 17, 1998	0.36

The correlation between MEDIX and MRSIX shifts across timeframes, from 0.36 (all time) to 0.52 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

MEDIX vs. MRSIX — Risk / Return Rank

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

MEDIX

MEDIX Risk / Return Rank: 81
MEDIX Sharpe Ratio Rank: 93
MEDIX Sortino Ratio Rank: 95
MEDIX Omega Ratio Rank: 90
MEDIX Calmar Ratio Rank: 59
MEDIX Martin Ratio Rank: 67

MRSIX

MRSIX Risk / Return Rank: 29
MRSIX Sharpe Ratio Rank: 31
MRSIX Sortino Ratio Rank: 31
MRSIX Omega Ratio Rank: 32
MRSIX Calmar Ratio Rank: 26
MRSIX Martin Ratio Rank: 28

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.

MEDIX vs. MRSIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Emerging Markets Debt Fund (MEDIX) and MFS Research International Fund (MRSIX). 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	MEDIX	MRSIX	Difference
Sharpe ratio: Return per unit of total volatility	2.93	1.49	+1.44
Sortino ratio: Return per unit of downside risk	4.82	2.14	+2.69
Omega ratio: Gain probability vs. loss probability	1.61	1.27	+0.33
Calmar ratio: Return relative to maximum drawdown	2.82	1.76	+1.06
Martin ratio: Return relative to average drawdown	12.28	6.06	+6.22

MEDIX vs. MRSIX - Sharpe Ratio Comparison

The current MEDIX Sharpe Ratio is 2.93, which is higher than the MRSIX Sharpe Ratio of 1.49. The chart below compares the historical Sharpe Ratios of MEDIX and MRSIX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

MEDIX vs. MRSIX - Drawdown Comparison

The maximum MEDIX drawdown since its inception was -35.31%, smaller than the maximum MRSIX drawdown of -59.56%. Use the drawdown chart below to compare losses from any high point for MEDIX and MRSIX.

Drawdown Indicators

	MEDIX	MRSIX	Difference
Max Drawdown Largest peak-to-trough decline	-35.31%	-59.56%	+24.25%
Max Drawdown (1Y) Largest decline over 1 year	-4.12%	-11.64%	+7.52%
Max Drawdown (3Y) Largest decline over 3 years	-7.48%	-13.95%	+6.47%
Max Drawdown (5Y) Largest decline over 5 years	-27.40%	-30.73%	+3.33%
Max Drawdown (10Y) Largest decline over 10 years	-27.40%	-30.73%	+3.33%
Current Drawdown Current decline from peak	-0.47%	-0.33%	-0.14%
Average Drawdown Average peak-to-trough decline	-4.44%	-12.73%	+8.29%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.94%	3.36%	-2.42%

Volatility

MEDIX vs. MRSIX - Volatility Comparison

The current volatility for MFS Emerging Markets Debt Fund (MEDIX) is 1.13%, while MFS Research International Fund (MRSIX) has a volatility of 4.59%. This indicates that MEDIX experiences smaller price fluctuations and is considered to be less risky than MRSIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MEDIX	MRSIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.13%	4.59%	-3.46%
Volatility (6M) Calculated over the trailing 6-month period	3.28%	11.32%	-8.04%
Volatility (1Y) Calculated over the trailing 1-year period	3.97%	13.76%	-9.79%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.90%	15.02%	-9.12%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.87%	15.44%	-9.57%

MEDIX vs. MRSIX - Expense Ratio Comparison

MEDIX has a 0.81% expense ratio, which is higher than MRSIX's 0.76% expense ratio.

Dividends

MEDIX vs. MRSIX - Dividend Comparison

MEDIX's dividend yield for the trailing twelve months is around 5.04%, more than MRSIX's 4.75% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MEDIX MFS Emerging Markets Debt Fund	5.04%	5.22%	5.68%	4.90%	5.51%	4.33%	4.07%	4.59%	4.87%	4.46%	4.86%	5.25%
MRSIX MFS Research International Fund	4.75%	5.26%	2.00%	1.67%	1.57%	1.29%	0.92%	1.79%	5.48%	1.21%	1.97%	1.89%

Frequently Asked Questions

Can I hold both MEDIX and MRSIX in my portfolio?

MEDIX and MRSIX have a correlation of 0.52, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MEDIX or MRSIX?

MRSIX has higher volatility (4.59%) compared to MEDIX (1.13%). In terms of maximum drawdown, MEDIX dropped -35.31% vs MRSIX's -59.56%.

Which has better risk-adjusted returns?

MEDIX currently has the higher Sharpe Ratio (2.93 vs 1.49), 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.