OISGX vs. OBMCX

Last updated Aug 5, 2026

OISGX (Optimum Small-Mid Cap Growth Fund) and OBMCX (Oberweis Micro-Cap Fund Investor Class) are both Small Cap Growth Equities funds. Over the past 10 years, OISGX returned 12.56%/yr vs 20.44%/yr for OBMCX. Their correlation of 0.89 means they have usually moved in the same direction. OISGX charges 1.29%/yr vs 1.46%/yr for OBMCX.

Performance

OISGX vs. OBMCX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Optimum Small-Mid Cap Growth Fund (OISGX) and Oberweis Micro-Cap Fund Investor Class (OBMCX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, OISGX achieves a 13.84% return, which is significantly lower than OBMCX's 40.02% return. Over the past 10 years, OISGX has underperformed OBMCX with an annualized return of 12.56%, while OBMCX has yielded a comparatively higher 20.44% annualized return.

OISGX

• 1D: 1.83%
• 1M: -3.36%
• 6M: 10.56%
• YTD: 13.84%
• 1Y: 24.82%
• 3Y*: 13.01%
• 5Y*: 4.18%
• 10Y*: 12.56%
• ALL TIME*: 9.55%

OBMCX

• 1D: 3.15%
• 1M: -3.94%
• 6M: 30.69%
• YTD: 40.02%
• 1Y: 53.84%
• 3Y*: 25.31%
• 5Y*: 19.49%
• 10Y*: 20.44%
• ALL TIME*: 11.25%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
OBMCX Oberweis Micro-Cap Fund Investor Class	$0.00	$0.00	$0.00
OISGX Optimum Small-Mid Cap Growth Fund	$0.00	$0.00	$0.00

OISGX vs. OBMCX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
OISGX Optimum Small-Mid Cap Growth Fund	13.84%	9.56%	14.23%	13.92%	-28.00%	12.89%	57.04%	25.72%	-3.00%	27.59%
OBMCX Oberweis Micro-Cap Fund Investor Class	40.02%	14.70%	22.82%	18.87%	-10.57%	53.20%	29.91%	21.94%	-12.04%	27.90%

Correlation

The correlation between OISGX and OBMCX is 0.86, meaning they have usually moved in the same direction, including during past declines.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.86
Correlation (3Y) Balances recent behavior with more history.	0.89
Correlation (5Y) Shows whether the relationship held over a longer period.	0.91
Correlation (10Y) Provides a long-term view across more market conditions.	0.90
Correlation (All Time) Calculated using the full available price history since Jul 23, 2003	0.89

The correlation between OISGX and OBMCX has been stable across timeframes, ranging from 0.86 to 0.91 - a consistent structural relationship.

Return for Risk

OISGX vs. OBMCX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

OISGX

OISGX Risk / Return Rank: 34
OISGX Sharpe Ratio Rank: 32
OISGX Sortino Ratio Rank: 33
OISGX Omega Ratio Rank: 30
OISGX Calmar Ratio Rank: 36
OISGX Martin Ratio Rank: 39

OBMCX

OBMCX Risk / Return Rank: 81
OBMCX Sharpe Ratio Rank: 83
OBMCX Sortino Ratio Rank: 74
OBMCX Omega Ratio Rank: 69
OBMCX Calmar Ratio Rank: 88
OBMCX Martin Ratio Rank: 91

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

OISGX vs. OBMCX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Optimum Small-Mid Cap Growth Fund (OISGX) and Oberweis Micro-Cap Fund Investor Class (OBMCX). 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	OISGX	OBMCX	Difference
Sharpe ratio: Return per unit of total volatility	1.25	2.02	-0.76
Sortino ratio: Return per unit of downside risk	1.85	2.62	-0.77
Omega ratio: Gain probability vs. loss probability	1.22	1.33	-0.11
Calmar ratio: Return relative to maximum drawdown	1.75	3.38	-1.63
Martin ratio: Return relative to average drawdown	6.33	13.36	-7.03

OISGX vs. OBMCX - Sharpe Ratio Comparison

The current OISGX Sharpe Ratio is 1.25, which is lower than the OBMCX Sharpe Ratio of 2.02. The chart below compares the historical Sharpe Ratios of OISGX and OBMCX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

OISGX vs. OBMCX - Drawdown Comparison

The maximum OISGX drawdown since its inception was -62.75%, smaller than the maximum OBMCX drawdown of -68.24%. Use the drawdown chart below to compare losses from any high point for OISGX and OBMCX.

Drawdown Indicators

	OISGX	OBMCX	Difference
Max Drawdown Largest peak-to-trough decline	-62.75%	-68.24%	+5.49%
Max Drawdown (1Y) Largest decline over 1 year	-15.52%	-17.19%	+1.67%
Max Drawdown (3Y) Largest decline over 3 years	-29.82%	-28.11%	-1.71%
Max Drawdown (5Y) Largest decline over 5 years	-35.63%	-28.11%	-7.52%
Max Drawdown (10Y) Largest decline over 10 years	-39.22%	-50.04%	+10.82%
Current Drawdown Current decline from peak	-5.83%	-10.15%	+4.32%
Average Drawdown Average peak-to-trough decline	-12.19%	-16.36%	+4.17%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.28%	4.34%	-0.06%

Volatility

OISGX vs. OBMCX - Volatility Comparison

The current volatility for Optimum Small-Mid Cap Growth Fund (OISGX) is 5.92%, while Oberweis Micro-Cap Fund Investor Class (OBMCX) has a volatility of 11.34%. This indicates that OISGX experiences smaller price fluctuations and is considered to be less risky than OBMCX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	OISGX	OBMCX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.92%	11.34%	-5.42%
Volatility (6M) Calculated over the trailing 6-month period	17.07%	23.75%	-6.68%
Volatility (1Y) Calculated over the trailing 1-year period	21.70%	28.81%	-7.11%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.34%	26.83%	-3.49%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.46%	26.27%	-2.81%

OISGX vs. OBMCX - Expense Ratio Comparison

OISGX has a 1.29% expense ratio, which is lower than OBMCX's 1.46% expense ratio.

Dividends

OISGX vs. OBMCX - Dividend Comparison

OISGX's dividend yield for the trailing twelve months is around 2.33%, more than OBMCX's 1.01% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
OBMCX Oberweis Micro-Cap Fund Investor Class	1.01%	1.41%	2.53%	0.00%	1.37%	24.35%	0.00%	0.00%	19.67%	11.76%	0.05%	3.07%
OISGX Optimum Small-Mid Cap Growth Fund	2.33%	2.65%	0.00%	0.00%	8.92%	32.79%	15.04%	9.33%	24.93%	4.21%	0.00%	15.87%

Frequently Asked Questions

Can I hold both OISGX and OBMCX in my portfolio?

OISGX and OBMCX have a correlation of 0.86, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, OISGX or OBMCX?

OBMCX has higher volatility (11.34%) compared to OISGX (5.92%). In terms of maximum drawdown, OISGX dropped -62.75% vs OBMCX's -68.24%.

Which has better risk-adjusted returns?

OBMCX currently has the higher Sharpe Ratio (2.02 vs 1.25), 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.