OAKEX vs. MWNIX

Last updated Jun 5, 2026

OAKEX (Oakmark International Small Cap Fund) and MWNIX (MFS International New Discovery Fund) are both Foreign Small & Mid Cap Equities funds. Over the past 10 years, OAKEX returned 7.47%/yr vs 6.25%/yr for MWNIX. A 0.77 correlation means they provide meaningful diversification when combined. OAKEX charges 1.34%/yr vs 1.03%/yr for MWNIX.

Performance

OAKEX vs. MWNIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Oakmark International Small Cap Fund (OAKEX) and MFS International New Discovery Fund (MWNIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, OAKEX achieves a -0.68% return, which is significantly lower than MWNIX's 6.00% return. Over the past 10 years, OAKEX has outperformed MWNIX with an annualized return of 7.47%, while MWNIX has yielded a comparatively lower 6.25% annualized return.

OAKEX

• 1D: -1.23%
• 1M: 1.68%
• YTD: -0.68%
• 6M: 2.44%
• 1Y: 5.12%
• 3Y*: 10.74%
• 5Y*: 3.89%
• 10Y*: 7.47%

MWNIX

• 1D: -0.81%
• 1M: 1.25%
• YTD: 6.00%
• 6M: 6.37%
• 1Y: 9.70%
• 3Y*: 9.82%
• 5Y*: 2.67%
• 10Y*: 6.25%

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

OAKEX vs. MWNIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
OAKEX Oakmark International Small Cap Fund	-0.68%	29.51%	-3.00%	19.59%	-14.50%	17.90%	5.00%	31.91%	-23.71%	26.03%
MWNIX MFS International New Discovery Fund	6.00%	16.88%	0.90%	13.03%	-18.63%	5.06%	9.98%	22.85%	-10.41%	30.67%

Correlation

The correlation between OAKEX and MWNIX is 0.79, 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	0.79
Correlation (3Y) Calculated over the trailing 3-year period	0.81
Correlation (5Y) Calculated over the trailing 5-year period	0.84
Correlation (10Y) Calculated over the trailing 10-year period	0.82
Correlation (All Time) Calculated using the full available price history since Oct 10, 1997	0.77

The correlation between OAKEX and MWNIX has been stable across timeframes, ranging from 0.77 to 0.84 - a consistent structural relationship.

Return for Risk

OAKEX vs. MWNIX — Risk / Return Rank

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

OAKEX

OAKEX Risk / Return Rank: 5
OAKEX Sharpe Ratio Rank: 6
OAKEX Sortino Ratio Rank: 6
OAKEX Omega Ratio Rank: 6
OAKEX Calmar Ratio Rank: 5
OAKEX Martin Ratio Rank: 5

MWNIX

MWNIX Risk / Return Rank: 12
MWNIX Sharpe Ratio Rank: 12
MWNIX Sortino Ratio Rank: 12
MWNIX Omega Ratio Rank: 12
MWNIX Calmar Ratio Rank: 10
MWNIX Martin Ratio Rank: 11

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.

OAKEX vs. MWNIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Oakmark International Small Cap Fund (OAKEX) and MFS International New Discovery Fund (MWNIX). 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.

	OAKEX	MWNIX	Difference
Sharpe ratio: Return per unit of total volatility	0.44	0.90	-0.46
Sortino ratio: Return per unit of downside risk	0.72	1.35	-0.63
Omega ratio: Gain probability vs. loss probability	1.09	1.17	-0.08
Calmar ratio: Return relative to maximum drawdown	0.38	0.88	-0.50
Martin ratio: Return relative to average drawdown	1.12	3.02	-1.90
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

OAKEX vs. MWNIX - Sharpe Ratio Comparison

The current OAKEX Sharpe Ratio is 0.44, which is lower than the MWNIX Sharpe Ratio of 0.90. The chart below compares the historical Sharpe Ratios of OAKEX and MWNIX, 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

	OAKEX	MWNIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.44	0.90	-0.46
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.22	0.20	+0.02
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.40	0.45	-0.05
Sharpe Ratio (All Time) Calculated using the full available price history	0.43	0.58	-0.15

Drawdowns

OAKEX vs. MWNIX - Drawdown Comparison

The maximum OAKEX drawdown since its inception was -70.12%, which is greater than MWNIX's maximum drawdown of -58.38%. Use the drawdown chart below to compare losses from any high point for OAKEX and MWNIX.

Drawdown Indicators

	OAKEX	MWNIX	Difference
Max Drawdown Largest peak-to-trough decline	-70.12%	-58.38%	-11.74%
Max Drawdown (1Y) Largest decline over 1 year	-17.18%	-11.78%	-5.40%
Max Drawdown (3Y) Largest decline over 3 years	-17.18%	-15.12%	-2.06%
Max Drawdown (5Y) Largest decline over 5 years	-38.40%	-33.67%	-4.73%
Max Drawdown (10Y) Largest decline over 10 years	-49.61%	-34.72%	-14.89%
Current Drawdown Current decline from peak	-5.80%	-2.49%	-3.31%
Average Drawdown Average peak-to-trough decline	-13.49%	-9.57%	-3.92%
Ulcer Index Depth and duration of drawdowns from previous peaks	5.78%	3.42%	+2.36%

Volatility

OAKEX vs. MWNIX - Volatility Comparison

Oakmark International Small Cap Fund (OAKEX) and MFS International New Discovery Fund (MWNIX) have volatilities of 3.69% and 3.60%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	OAKEX	MWNIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.69%	3.60%	+0.09%
Volatility (6M) Calculated over the trailing 6-month period	11.36%	9.51%	+1.85%
Volatility (1Y) Calculated over the trailing 1-year period	14.88%	11.52%	+3.36%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.69%	13.18%	+4.51%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.65%	13.99%	+4.66%

OAKEX vs. MWNIX - Expense Ratio Comparison

OAKEX has a 1.34% expense ratio, which is higher than MWNIX's 1.03% expense ratio.

Dividends

OAKEX vs. MWNIX - Dividend Comparison

OAKEX's dividend yield for the trailing twelve months is around 5.28%, more than MWNIX's 3.05% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MWNIX MFS International New Discovery Fund	3.05%	3.24%	7.61%	4.05%	5.68%	5.06%	3.90%	2.67%	6.68%	1.63%	1.09%	1.12%
OAKEX Oakmark International Small Cap Fund	5.28%	5.24%	6.38%	1.83%	1.89%	0.61%	1.87%	0.21%	8.93%	3.64%	3.09%	5.06%

Frequently Asked Questions

Can I hold both OAKEX and MWNIX in my portfolio?

OAKEX and MWNIX have a correlation of 0.79, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, OAKEX or MWNIX?

OAKEX has higher volatility (3.69%) compared to MWNIX (3.60%). In terms of maximum drawdown, OAKEX dropped -70.12% vs MWNIX's -58.38%.

Which has better risk-adjusted returns?

MWNIX currently has the higher Sharpe Ratio (0.90 vs 0.44), 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.