OBIIX vs. OBSOX

Last updated Jun 3, 2026

OBIIX (Oberweis International Opportunities Institutional Fund) and OBSOX (Oberweis Small-Cap Opportunities Fund) are both mutual funds - OBIIX is a Foreign Small & Mid Cap Equities fund managed by Oberweis, while OBSOX is a Small Cap Growth Equities fund managed by Oberweis. Over the past 10 years, OBIIX returned 7.37%/yr vs 18.67%/yr for OBSOX. A 0.57 correlation means they provide meaningful diversification when combined. OBIIX charges 1.10%/yr vs 1.25%/yr for OBSOX.

Performance

OBIIX vs. OBSOX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Oberweis International Opportunities Institutional Fund (OBIIX) and Oberweis Small-Cap Opportunities Fund (OBSOX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, OBIIX achieves a 9.65% return, which is significantly lower than OBSOX's 32.65% return. Over the past 10 years, OBIIX has underperformed OBSOX with an annualized return of 7.37%, while OBSOX has yielded a comparatively higher 18.67% annualized return.

OBIIX

• 1D: -1.33%
• 1M: 2.11%
• YTD: 9.65%
• 6M: 12.62%
• 1Y: 18.15%
• 3Y*: 16.00%
• 5Y*: -1.14%
• 10Y*: 7.37%

OBSOX

• 1D: 1.34%
• 1M: 5.11%
• YTD: 32.65%
• 6M: 33.47%
• 1Y: 58.95%
• 3Y*: 22.87%
• 5Y*: 16.20%
• 10Y*: 18.67%

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

OBIIX vs. OBSOX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
OBIIX Oberweis International Opportunities Institutional Fund	9.65%	31.07%	4.35%	5.72%	-37.45%	1.92%	63.66%	23.51%	-23.84%	41.06%
OBSOX Oberweis Small-Cap Opportunities Fund	32.65%	14.28%	16.13%	15.81%	-11.17%	43.39%	32.52%	25.06%	-7.05%	25.55%

Correlation

The correlation between OBIIX and OBSOX is 0.49, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.49
Correlation (3Y) Calculated over the trailing 3-year period	0.56
Correlation (5Y) Calculated over the trailing 5-year period	0.64
Correlation (10Y) Calculated over the trailing 10-year period	0.59
Correlation (All Time) Calculated using the full available price history since Mar 12, 2014	0.57

The correlation between OBIIX and OBSOX shifts across timeframes, from 0.49 (1 year) to 0.64 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

OBIIX vs. OBSOX — Risk / Return Rank

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

OBIIX

OBIIX Risk / Return Rank: 17
OBIIX Sharpe Ratio Rank: 18
OBIIX Sortino Ratio Rank: 18
OBIIX Omega Ratio Rank: 18
OBIIX Calmar Ratio Rank: 14
OBIIX Martin Ratio Rank: 16

OBSOX

OBSOX Risk / Return Rank: 71
OBSOX Sharpe Ratio Rank: 67
OBSOX Sortino Ratio Rank: 52
OBSOX Omega Ratio Rank: 51
OBSOX Calmar Ratio Rank: 93
OBSOX Martin Ratio Rank: 92

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.

OBIIX vs. OBSOX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Oberweis International Opportunities Institutional Fund (OBIIX) and Oberweis Small-Cap Opportunities Fund (OBSOX). 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.

	OBIIX	OBSOX	Difference
Sharpe ratio Return per unit of total volatility	1.24	2.39	-1.16
Sortino ratio Return per unit of downside risk	1.79	3.05	-1.26
Omega ratio Gain probability vs. loss probability	1.23	1.39	-0.17
Calmar ratio Return relative to maximum drawdown	1.34	5.22	-3.89
Martin ratio Return relative to average drawdown	4.77	19.37	-14.60
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

OBIIX vs. OBSOX - Sharpe Ratio Comparison

The current OBIIX Sharpe Ratio is 1.24, which is lower than the OBSOX Sharpe Ratio of 2.39. The chart below compares the historical Sharpe Ratios of OBIIX and OBSOX, 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

	OBIIX	OBSOX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.24	2.39	-1.16
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.06	0.65	-0.71
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.38	0.76	-0.38
Sharpe Ratio (All Time) Calculated using the full available price history	0.35	0.33	+0.02

Drawdowns

OBIIX vs. OBSOX - Drawdown Comparison

The maximum OBIIX drawdown since its inception was -51.22%, smaller than the maximum OBSOX drawdown of -80.52%. Use the drawdown chart below to compare losses from any high point for OBIIX and OBSOX.

Drawdown Indicators

	OBIIX	OBSOX	Difference
Max Drawdown Largest peak-to-trough decline	-51.22%	-80.52%	+29.30%
Max Drawdown (1Y) Largest decline over 1 year	-15.67%	-11.40%	-4.27%
Max Drawdown (3Y) Largest decline over 3 years	-17.08%	-27.74%	+10.66%
Max Drawdown (5Y) Largest decline over 5 years	-51.22%	-28.65%	-22.57%
Max Drawdown (10Y) Largest decline over 10 years	-51.22%	-42.79%	-8.43%
Current Drawdown Current decline from peak	-12.77%	-0.62%	-12.15%
Average Drawdown Average peak-to-trough decline	-17.23%	-30.55%	+13.32%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.40%	3.07%	+1.33%

Volatility

OBIIX vs. OBSOX - Volatility Comparison

The current volatility for Oberweis International Opportunities Institutional Fund (OBIIX) is 5.15%, while Oberweis Small-Cap Opportunities Fund (OBSOX) has a volatility of 8.66%. This indicates that OBIIX experiences smaller price fluctuations and is considered to be less risky than OBSOX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	OBIIX	OBSOX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.15%	8.66%	-3.51%
Volatility (6M) Calculated over the trailing 6-month period	14.16%	20.24%	-6.08%
Volatility (1Y) Calculated over the trailing 1-year period	16.74%	25.47%	-8.73%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.67%	25.04%	-5.37%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.70%	24.76%	-5.06%

OBIIX vs. OBSOX - Expense Ratio Comparison

OBIIX has a 1.10% expense ratio, which is lower than OBSOX's 1.25% expense ratio.

Dividends

OBIIX vs. OBSOX - Dividend Comparison

OBIIX's dividend yield for the trailing twelve months is around 1.00%, while OBSOX has not paid dividends to shareholders.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
OBIIX Oberweis International Opportunities Institutional Fund	1.00%	1.10%	0.00%	1.93%	0.00%	31.91%	0.51%	1.31%	13.63%	7.30%	0.40%	0.55%
OBSOX Oberweis Small-Cap Opportunities Fund	0.00%	0.00%	0.80%	0.00%	0.17%	21.88%	4.05%	3.04%	28.22%	6.36%	4.24%	11.91%

Frequently Asked Questions

Can I hold both OBIIX and OBSOX in my portfolio?

OBIIX and OBSOX have a correlation of 0.49, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, OBIIX or OBSOX?

OBSOX has higher volatility (8.66%) compared to OBIIX (5.15%). In terms of maximum drawdown, OBIIX dropped -51.22% vs OBSOX's -80.52%.

Which has better risk-adjusted returns?

OBSOX currently has the higher Sharpe Ratio (2.39 vs 1.24), 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.