MRSIX vs. FSOSX

Last updated Apr 1, 2026

Compare and contrast key facts about MFS Research International Fund (MRSIX) and Fidelity Series Overseas Fund (FSOSX).

MRSIX is managed by MFS. It was launched on Jan 2, 1997. FSOSX is managed by Fidelity. It was launched on Jun 21, 2019.

Performance

MRSIX vs. FSOSX - Performance Comparison

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

MRSIX vs. FSOSX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
MRSIX MFS Research International Fund	-1.59%	22.61%	3.06%	13.44%	-17.33%	11.87%	13.18%	9.21%
FSOSX Fidelity Series Overseas Fund	-5.69%	21.29%	5.87%	21.49%	-23.25%	19.59%	16.36%	7.78%

Returns By Period

In the year-to-date period, MRSIX achieves a -1.59% return, which is significantly higher than FSOSX's -5.69% return.

MRSIX

• 1D: 0.34%
• 1M: -11.34%
• YTD: -1.59%
• 6M: 2.29%
• 1Y: 14.99%
• 3Y*: 9.64%
• 5Y*: 5.01%
• 10Y*: 8.08%

FSOSX

• 1D: 0.36%
• 1M: -11.39%
• YTD: -5.69%
• 6M: -5.28%
• 1Y: 7.28%
• 3Y*: 10.01%
• 5Y*: 5.83%
• 10Y*: —

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

MRSIX vs. FSOSX - Expense Ratio Comparison

MRSIX has a 0.76% expense ratio, which is higher than FSOSX's 0.01% expense ratio.

MRSIX

MFS Research International Fund

FSOSX

Fidelity Series Overseas Fund

Return for Risk

MRSIX vs. FSOSX — Risk / Return Rank

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

MRSIX

MRSIX Risk / Return Rank: 43
MRSIX Sharpe Ratio Rank: 48
MRSIX Sortino Ratio Rank: 43
MRSIX Omega Ratio Rank: 42
MRSIX Calmar Ratio Rank: 43
MRSIX Martin Ratio Rank: 40

FSOSX

FSOSX Risk / Return Rank: 14
FSOSX Sharpe Ratio Rank: 14
FSOSX Sortino Ratio Rank: 13
FSOSX Omega Ratio Rank: 13
FSOSX Calmar Ratio Rank: 15
FSOSX Martin Ratio Rank: 16

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.

MRSIX vs. FSOSX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Research International Fund (MRSIX) and Fidelity Series Overseas Fund (FSOSX). 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.

	MRSIX	FSOSX	Difference
Sharpe ratio Return per unit of total volatility	0.94	0.34	+0.60
Sortino ratio Return per unit of downside risk	1.29	0.58	+0.71
Omega ratio Gain probability vs. loss probability	1.18	1.08	+0.10
Calmar ratio Return relative to maximum drawdown	1.09	0.40	+0.68
Martin ratio Return relative to average drawdown	4.15	1.51	+2.64
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MRSIX vs. FSOSX - Sharpe Ratio Comparison

The current MRSIX Sharpe Ratio is 0.94, which is higher than the FSOSX Sharpe Ratio of 0.34. The chart below compares the historical Sharpe Ratios of MRSIX and FSOSX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	MRSIX	FSOSX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.94	0.34	+0.60
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.34	0.34	0.00
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.53	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.37	0.43	-0.06

Correlation

The correlation between MRSIX and FSOSX is 0.94, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

MRSIX vs. FSOSX - Dividend Comparison

MRSIX's dividend yield for the trailing twelve months is around 5.34%, less than FSOSX's 9.70% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MRSIX MFS Research International Fund	5.34%	5.26%	2.00%	1.67%	1.57%	1.29%	0.92%	1.79%	5.48%	1.21%	1.97%	1.89%
FSOSX Fidelity Series Overseas Fund	9.70%	9.15%	2.25%	1.63%	1.80%	2.92%	1.12%	0.37%	0.00%	0.00%	0.00%	0.00%

Drawdowns

MRSIX vs. FSOSX - Drawdown Comparison

The maximum MRSIX drawdown since its inception was -59.56%, which is greater than FSOSX's maximum drawdown of -35.36%. Use the drawdown chart below to compare losses from any high point for MRSIX and FSOSX.

Drawdown Indicators

	MRSIX	FSOSX	Difference
Max Drawdown Largest peak-to-trough decline	-59.56%	-35.36%	-24.20%
Max Drawdown (1Y) Largest decline over 1 year	-11.64%	-12.39%	+0.75%
Max Drawdown (5Y) Largest decline over 5 years	-30.73%	-35.36%	+4.63%
Max Drawdown (10Y) Largest decline over 10 years	-30.73%	—	—
Current Drawdown Current decline from peak	-11.34%	-11.89%	+0.55%
Average Drawdown Average peak-to-trough decline	-12.80%	-7.90%	-4.90%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.05%	3.31%	-0.26%

Volatility

MRSIX vs. FSOSX - Volatility Comparison

The current volatility for MFS Research International Fund (MRSIX) is 6.13%, while Fidelity Series Overseas Fund (FSOSX) has a volatility of 8.28%. This indicates that MRSIX experiences smaller price fluctuations and is considered to be less risky than FSOSX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MRSIX	FSOSX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.13%	8.28%	-2.15%
Volatility (6M) Calculated over the trailing 6-month period	9.53%	11.94%	-2.41%
Volatility (1Y) Calculated over the trailing 1-year period	14.77%	18.25%	-3.48%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.76%	17.35%	-2.59%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	15.41%	18.93%	-3.52%