MRSAX vs. KGIIX

Last updated Jun 3, 2026

MRSAX (MFS Research International A) and KGIIX (Kopernik International Fund) are both Foreign Large Cap Equities funds. Over the past 10 years, MRSAX returned 8.38%/yr vs 10.13%/yr for KGIIX. A 0.57 correlation means they provide meaningful diversification when combined. Both charge a 1.04% expense ratio.

Performance

MRSAX vs. KGIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Research International A (MRSAX) and Kopernik International Fund (KGIIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MRSAX achieves a 8.11% return, which is significantly lower than KGIIX's 9.65% return. Over the past 10 years, MRSAX has underperformed KGIIX with an annualized return of 8.38%, while KGIIX has yielded a comparatively higher 10.13% annualized return.

MRSAX

• 1D: -0.50%
• 1M: 2.11%
• YTD: 8.11%
• 6M: 10.60%
• 1Y: 14.94%
• 3Y*: 12.35%
• 5Y*: 5.27%
• 10Y*: 8.38%

KGIIX

• 1D: 0.00%
• 1M: -0.74%
• YTD: 9.65%
• 6M: 13.51%
• 1Y: 37.27%
• 3Y*: 18.86%
• 5Y*: 8.64%
• 10Y*: 10.13%

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

MRSAX vs. KGIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MRSAX MFS Research International A	8.11%	22.31%	2.83%	13.11%	-17.52%	11.62%	12.90%	27.67%	-14.20%	28.05%
KGIIX Kopernik International Fund	9.65%	54.97%	-7.01%	13.86%	-14.05%	16.62%	18.94%	16.37%	-6.24%	10.50%

Correlation

The correlation between MRSAX and KGIIX is 0.59, 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	0.59
Correlation (3Y) Calculated over the trailing 3-year period	0.49
Correlation (5Y) Calculated over the trailing 5-year period	0.61
Correlation (10Y) Calculated over the trailing 10-year period	0.57
Correlation (All Time) Calculated using the full available price history since Jan 5, 2016	0.57

The correlation between MRSAX and KGIIX shifts across timeframes, from 0.49 (3 years) to 0.61 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

MRSAX vs. KGIIX — Risk / Return Rank

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

MRSAX

MRSAX Risk / Return Rank: 18
MRSAX Sharpe Ratio Rank: 18
MRSAX Sortino Ratio Rank: 18
MRSAX Omega Ratio Rank: 18
MRSAX Calmar Ratio Rank: 16
MRSAX Martin Ratio Rank: 18

KGIIX

KGIIX Risk / Return Rank: 82
KGIIX Sharpe Ratio Rank: 90
KGIIX Sortino Ratio Rank: 79
KGIIX Omega Ratio Rank: 81
KGIIX Calmar Ratio Rank: 88
KGIIX Martin Ratio Rank: 73

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.

MRSAX vs. KGIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Research International A (MRSAX) and Kopernik International Fund (KGIIX). 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.

	MRSAX	KGIIX	Difference
Sharpe ratio Return per unit of total volatility	1.23	2.97	-1.74
Sortino ratio Return per unit of downside risk	1.80	3.75	-1.96
Omega ratio Gain probability vs. loss probability	1.23	1.54	-0.31
Calmar ratio Return relative to maximum drawdown	1.42	4.29	-2.87
Martin ratio Return relative to average drawdown	4.95	13.81	-8.86
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MRSAX vs. KGIIX - Sharpe Ratio Comparison

The current MRSAX Sharpe Ratio is 1.23, which is lower than the KGIIX Sharpe Ratio of 2.97. The chart below compares the historical Sharpe Ratios of MRSAX and KGIIX, 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

	MRSAX	KGIIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.23	2.97	-1.74
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.35	0.66	-0.30
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.54	0.80	-0.26
Sharpe Ratio (All Time) Calculated using the full available price history	0.37	0.93	-0.56

Drawdowns

MRSAX vs. KGIIX - Drawdown Comparison

The maximum MRSAX drawdown since its inception was -59.76%, which is greater than KGIIX's maximum drawdown of -27.81%. Use the drawdown chart below to compare losses from any high point for MRSAX and KGIIX.

Drawdown Indicators

	MRSAX	KGIIX	Difference
Max Drawdown Largest peak-to-trough decline	-59.76%	-27.81%	-31.95%
Max Drawdown (1Y) Largest decline over 1 year	-11.68%	-8.76%	-2.92%
Max Drawdown (3Y) Largest decline over 3 years	-14.05%	-13.58%	-0.47%
Max Drawdown (5Y) Largest decline over 5 years	-30.93%	-27.81%	-3.12%
Max Drawdown (10Y) Largest decline over 10 years	-30.93%	-27.81%	-3.12%
Current Drawdown Current decline from peak	-2.56%	-4.41%	+1.85%
Average Drawdown Average peak-to-trough decline	-13.09%	-6.11%	-6.98%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.35%	2.72%	+0.63%

Volatility

MRSAX vs. KGIIX - Volatility Comparison

MFS Research International A (MRSAX) has a higher volatility of 4.07% compared to Kopernik International Fund (KGIIX) at 2.98%. This indicates that MRSAX's price experiences larger fluctuations and is considered to be riskier than KGIIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MRSAX	KGIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.07%	2.98%	+1.09%
Volatility (6M) Calculated over the trailing 6-month period	10.63%	10.27%	+0.36%
Volatility (1Y) Calculated over the trailing 1-year period	13.35%	13.00%	+0.35%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.94%	13.21%	+1.73%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	15.46%	12.68%	+2.78%

MRSAX vs. KGIIX - Expense Ratio Comparison

Both MRSAX and KGIIX have an expense ratio of 1.04%.

Dividends

MRSAX vs. KGIIX - Dividend Comparison

MRSAX's dividend yield for the trailing twelve months is around 4.84%, less than KGIIX's 13.01% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
KGIIX Kopernik International Fund	13.01%	14.26%	0.48%	12.56%	2.46%	5.77%	2.89%	2.50%	1.19%	1.35%	0.33%	0.00%
MRSAX MFS Research International A	4.84%	5.23%	1.81%	1.49%	1.37%	1.04%	0.73%	1.63%	5.41%	1.04%	1.71%	1.67%

Frequently Asked Questions

Can I hold both MRSAX and KGIIX in my portfolio?

MRSAX and KGIIX have a correlation of 0.59, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MRSAX or KGIIX?

MRSAX has higher volatility (4.07%) compared to KGIIX (2.98%). In terms of maximum drawdown, MRSAX dropped -59.76% vs KGIIX's -27.81%.

Which has better risk-adjusted returns?

KGIIX currently has the higher Sharpe Ratio (2.97 vs 1.23), 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.