MWOFX vs. OBEGX

Last updated Jun 4, 2026

MWOFX (MFS Global Growth Fund) and OBEGX (Oberweis Global Opportunities Fund) are both Global Equities funds. Over the past 10 years, MWOFX returned 10.46%/yr vs 12.03%/yr for OBEGX. A 0.76 correlation means they provide meaningful diversification when combined. MWOFX charges 1.22%/yr vs 1.51%/yr for OBEGX.

Performance

MWOFX vs. OBEGX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Global Growth Fund (MWOFX) and Oberweis Global Opportunities Fund (OBEGX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MWOFX achieves a -2.13% return, which is significantly lower than OBEGX's 28.94% return. Over the past 10 years, MWOFX has underperformed OBEGX with an annualized return of 10.46%, while OBEGX has yielded a comparatively higher 12.03% annualized return.

MWOFX

• 1D: -0.23%
• 1M: 1.91%
• YTD: -2.13%
• 6M: -1.52%
• 1Y: 3.58%
• 3Y*: 8.04%
• 5Y*: 4.13%
• 10Y*: 10.46%

OBEGX

• 1D: 1.71%
• 1M: 7.16%
• YTD: 28.94%
• 6M: 27.03%
• 1Y: 48.45%
• 3Y*: 20.12%
• 5Y*: 6.92%
• 10Y*: 12.03%

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

MWOFX vs. OBEGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MWOFX MFS Global Growth Fund	-2.13%	7.17%	10.68%	20.63%	-19.28%	18.33%	20.23%	35.37%	-4.94%	31.13%
OBEGX Oberweis Global Opportunities Fund	28.94%	19.32%	10.72%	6.40%	-26.76%	20.80%	55.68%	25.67%	-25.62%	33.35%

Correlation

The correlation between MWOFX and OBEGX is 0.62, 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	0.62
Correlation (3Y) Calculated over the trailing 3-year period	0.71
Correlation (5Y) Calculated over the trailing 5-year period	0.77
Correlation (10Y) Calculated over the trailing 10-year period	0.77
Correlation (All Time) Calculated using the full available price history since Nov 19, 1993	0.76

The correlation between MWOFX and OBEGX shifts across timeframes, from 0.62 (1 year) to 0.77 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

MWOFX vs. OBEGX — Risk / Return Rank

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

MWOFX

MWOFX Risk / Return Rank: 4
MWOFX Sharpe Ratio Rank: 5
MWOFX Sortino Ratio Rank: 4
MWOFX Omega Ratio Rank: 4
MWOFX Calmar Ratio Rank: 4
MWOFX Martin Ratio Rank: 4

OBEGX

OBEGX Risk / Return Rank: 73
OBEGX Sharpe Ratio Rank: 72
OBEGX Sortino Ratio Rank: 60
OBEGX Omega Ratio Rank: 56
OBEGX Calmar Ratio Rank: 89
OBEGX Martin Ratio Rank: 85

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.

MWOFX vs. OBEGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Global Growth Fund (MWOFX) and Oberweis Global Opportunities Fund (OBEGX). 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.

	MWOFX	OBEGX	Difference
Sharpe ratio: Return per unit of total volatility	0.33	2.48	-2.14
Sortino ratio: Return per unit of downside risk	0.54	3.27	-2.73
Omega ratio: Gain probability vs. loss probability	1.06	1.42	-0.35
Calmar ratio: Return relative to maximum drawdown	0.29	4.50	-4.21
Martin ratio: Return relative to average drawdown	0.91	16.29	-15.39
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MWOFX vs. OBEGX - Sharpe Ratio Comparison

The current MWOFX Sharpe Ratio is 0.33, which is lower than the OBEGX Sharpe Ratio of 2.48. The chart below compares the historical Sharpe Ratios of MWOFX and OBEGX, 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

	MWOFX	OBEGX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.33	2.48	-2.14
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.26	0.30	-0.04
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.63	0.53	+0.10
Sharpe Ratio (All Time) Calculated using the full available price history	0.48	0.24	+0.24

Drawdowns

MWOFX vs. OBEGX - Drawdown Comparison

The maximum MWOFX drawdown since its inception was -56.10%, smaller than the maximum OBEGX drawdown of -83.07%. Use the drawdown chart below to compare losses from any high point for MWOFX and OBEGX.

Drawdown Indicators

	MWOFX	OBEGX	Difference
Max Drawdown Largest peak-to-trough decline	-56.10%	-83.07%	+26.97%
Max Drawdown (1Y) Largest decline over 1 year	-13.82%	-11.24%	-2.58%
Max Drawdown (3Y) Largest decline over 3 years	-16.45%	-25.41%	+8.96%
Max Drawdown (5Y) Largest decline over 5 years	-27.64%	-39.68%	+12.04%
Max Drawdown (10Y) Largest decline over 10 years	-31.68%	-41.54%	+9.86%
Current Drawdown Current decline from peak	-4.48%	0.00%	-4.48%
Average Drawdown Average peak-to-trough decline	-11.91%	-33.72%	+21.81%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.40%	3.10%	+1.30%

Volatility

MWOFX vs. OBEGX - Volatility Comparison

The current volatility for MFS Global Growth Fund (MWOFX) is 3.15%, while Oberweis Global Opportunities Fund (OBEGX) has a volatility of 6.92%. This indicates that MWOFX experiences smaller price fluctuations and is considered to be less risky than OBEGX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MWOFX	OBEGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.15%	6.92%	-3.77%
Volatility (6M) Calculated over the trailing 6-month period	9.37%	16.00%	-6.63%
Volatility (1Y) Calculated over the trailing 1-year period	12.06%	20.47%	-8.41%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.80%	23.20%	-7.40%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.61%	22.63%	-6.02%

MWOFX vs. OBEGX - Expense Ratio Comparison

MWOFX has a 1.22% expense ratio, which is lower than OBEGX's 1.51% expense ratio.

Dividends

MWOFX vs. OBEGX - Dividend Comparison

MWOFX's dividend yield for the trailing twelve months is around 5.54%, less than OBEGX's 9.82% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MWOFX MFS Global Growth Fund	5.54%	5.42%	5.14%	2.09%	3.60%	6.25%	3.13%	1.86%	5.00%	3.43%	1.68%	6.08%
OBEGX Oberweis Global Opportunities Fund	9.82%	12.66%	0.00%	0.00%	2.64%	25.09%	5.80%	0.00%	6.68%	13.37%	1.12%	14.32%

Frequently Asked Questions

Can I hold both MWOFX and OBEGX in my portfolio?

MWOFX and OBEGX have a correlation of 0.62, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MWOFX or OBEGX?

OBEGX has higher volatility (6.92%) compared to MWOFX (3.15%). In terms of maximum drawdown, MWOFX dropped -56.10% vs OBEGX's -83.07%.

Which has better risk-adjusted returns?

OBEGX currently has the higher Sharpe Ratio (2.48 vs 0.33), 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.