OBMCX vs. OBSOX

Last updated Jun 3, 2026

OBMCX (Oberweis Micro Cap Fund) and OBSOX (Oberweis Small-Cap Opportunities Fund) are both Small Cap Growth Equities funds from Oberweis. Over the past 10 years, OBMCX returned 21.28%/yr vs 18.67%/yr for OBSOX. Their correlation of 0.85 suggests significant overlap in exposure. OBMCX charges 1.48%/yr vs 1.25%/yr for OBSOX.

Performance

OBMCX vs. OBSOX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Oberweis Micro Cap Fund (OBMCX) 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, OBMCX achieves a 41.55% return, which is significantly higher than OBSOX's 32.65% return. Over the past 10 years, OBMCX has outperformed OBSOX with an annualized return of 21.28%, while OBSOX has yielded a comparatively lower 18.67% annualized return.

OBMCX

• 1D: 0.92%
• 1M: -0.36%
• YTD: 41.55%
• 6M: 43.29%
• 1Y: 75.01%
• 3Y*: 28.53%
• 5Y*: 19.14%
• 10Y*: 21.28%

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)

OBMCX vs. OBSOX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
OBMCX Oberweis Micro Cap Fund	41.55%	14.70%	22.82%	18.87%	-10.57%	53.20%	29.91%	21.94%	-12.04%	27.90%
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 OBMCX and OBSOX is 0.88, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.88
Correlation (3Y) Calculated over the trailing 3-year period	0.92
Correlation (5Y) Calculated over the trailing 5-year period	0.94
Correlation (10Y) Calculated over the trailing 10-year period	0.94
Correlation (All Time) Calculated using the full available price history since Sep 17, 1996	0.85

The correlation between OBMCX and OBSOX has been stable across timeframes, ranging from 0.85 to 0.94 - a consistent structural relationship.

Return for Risk

OBMCX vs. OBSOX — Risk / Return Rank

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

OBMCX

OBMCX Risk / Return Rank: 88
OBMCX Sharpe Ratio Rank: 92
OBMCX Sortino Ratio Rank: 79
OBMCX Omega Ratio Rank: 75
OBMCX Calmar Ratio Rank: 96
OBMCX Martin Ratio Rank: 96

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.

OBMCX vs. OBSOX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Oberweis Micro Cap Fund (OBMCX) 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.

	OBMCX	OBSOX	Difference
Sharpe ratio Return per unit of total volatility	3.09	2.39	+0.69
Sortino ratio Return per unit of downside risk	3.76	3.05	+0.70
Omega ratio Gain probability vs. loss probability	1.49	1.39	+0.10
Calmar ratio Return relative to maximum drawdown	6.01	5.22	+0.78
Martin ratio Return relative to average drawdown	24.18	19.37	+4.81
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

OBMCX vs. OBSOX - Sharpe Ratio Comparison

The current OBMCX Sharpe Ratio is 3.09, which is comparable to the OBSOX Sharpe Ratio of 2.39. The chart below compares the historical Sharpe Ratios of OBMCX 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

	OBMCX	OBSOX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.09	2.39	+0.69
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.74	0.65	+0.08
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.83	0.76	+0.07
Sharpe Ratio (All Time) Calculated using the full available price history	0.45	0.33	+0.12

Drawdowns

OBMCX vs. OBSOX - Drawdown Comparison

The maximum OBMCX drawdown since its inception was -68.24%, smaller than the maximum OBSOX drawdown of -80.52%. Use the drawdown chart below to compare losses from any high point for OBMCX and OBSOX.

Drawdown Indicators

	OBMCX	OBSOX	Difference
Max Drawdown Largest peak-to-trough decline	-68.24%	-80.52%	+12.28%
Max Drawdown (1Y) Largest decline over 1 year	-12.45%	-11.40%	-1.05%
Max Drawdown (3Y) Largest decline over 3 years	-28.11%	-27.74%	-0.37%
Max Drawdown (5Y) Largest decline over 5 years	-28.11%	-28.65%	+0.54%
Max Drawdown (10Y) Largest decline over 10 years	-50.04%	-42.79%	-7.25%
Current Drawdown Current decline from peak	-2.09%	-0.62%	-1.47%
Average Drawdown Average peak-to-trough decline	-16.42%	-30.55%	+14.13%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.09%	3.07%	+0.02%

Volatility

OBMCX vs. OBSOX - Volatility Comparison

The current volatility for Oberweis Micro Cap Fund (OBMCX) is 7.91%, while Oberweis Small-Cap Opportunities Fund (OBSOX) has a volatility of 8.66%. This indicates that OBMCX 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

	OBMCX	OBSOX	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.91%	8.66%	-0.75%
Volatility (6M) Calculated over the trailing 6-month period	18.48%	20.24%	-1.76%
Volatility (1Y) Calculated over the trailing 1-year period	24.79%	25.47%	-0.68%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	26.17%	25.04%	+1.13%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	25.86%	24.76%	+1.10%

OBMCX vs. OBSOX - Expense Ratio Comparison

OBMCX has a 1.48% expense ratio, which is higher than OBSOX's 1.25% expense ratio.

Dividends

OBMCX vs. OBSOX - Dividend Comparison

OBMCX'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
OBMCX Oberweis Micro Cap Fund	1.00%	1.41%	2.53%	0.00%	1.37%	24.35%	0.00%	0.00%	19.67%	11.76%	0.05%	3.07%
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 OBMCX and OBSOX in my portfolio?

OBMCX and OBSOX have a correlation of 0.88, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, OBMCX or OBSOX?

OBSOX has higher volatility (8.66%) compared to OBMCX (7.91%). In terms of maximum drawdown, OBMCX dropped -68.24% vs OBSOX's -80.52%.

Which has better risk-adjusted returns?

OBMCX currently has the higher Sharpe Ratio (3.09 vs 2.39), 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.