OBMCX Performance — Oberweis Micro-Cap Fund, Investor Class
Data updated: 2026-08-28
OBMCX returned +55.84% year to date and +78.14% over one year to Jun 2026. Annualised returns are +30.11% over 3 years and +20.81% over 5 years. The fund beat its US Small Growth category average: $100 invested three years ago grew to $220, against $156 for the category, and to $178 over one year, against $132. Volatility over the past three years was 24.72% a year. In the 12 months to Jun 2026 the fund took in a net $272.9M, and assets reached $1.61B.
OBMCX Growth of $100
What $100 invested in Oberweis Micro-Cap Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the US Small Growth category average over the same months.
| Period | OBMCX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $178 | $132 |
| 3 years (Jul 2023 – Jun 2026) | $220 | $156 |
| 5 years (Jul 2021 – Jun 2026) | $257 | $127 |
| Since data start (Jul 2019 – Jun 2026) | $458 | $203 |
OBMCX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +55.84% |
| 1 year | +78.14% |
| 3 years (annualised) | +30.11% |
| 5 years (annualised) | +20.81% |
OBMCX Annual Returns
Calendar-year total returns of Oberweis Micro-Cap Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +55.84% |
| 2025 | +14.71% |
| 2024 | +22.87% |
| 2023 | +18.87% |
| 2022 | −10.60% |
| 2021 | +53.38% |
| 2020 | +29.91% |
| 2019 (Jul–Dec) | −1.50% |
OBMCX Monthly Returns
Monthly total returns as reported on SEC Form N-PORT.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | +5.7% | +9.1% | −1.6% | +23.1% | +0.4% | +11.1% | — | — | — | — | — | — |
| 2025 | +1.7% | −7.4% | −7.6% | −0.3% | +6.4% | +8.8% | +3.7% | +8.2% | +3.1% | +0.6% | −1.4% | −0.4% |
| 2024 | −3.9% | +6.9% | +0.7% | −5.8% | +10.7% | +1.9% | +4.5% | +1.7% | +1.7% | −2.2% | +12.7% | −6.4% |
| 2023 | +11.7% | +0.5% | −2.8% | −6.6% | +4.4% | +11.4% | +4.3% | −5.2% | −7.1% | −10.7% | +8.9% | +12.4% |
| 2022 | −12.6% | +4.5% | +0.2% | −8.7% | +2.9% | −9.2% | +14.7% | −1.7% | −9.2% | +15.0% | +4.2% | −6.7% |
| 2021 | +9.1% | +13.8% | +1.7% | +4.1% | +1.8% | +4.0% | −2.3% | +2.8% | −4.0% | +6.1% | +2.0% | +5.6% |
| 2020 | −2.3% | −7.9% | −24.9% | +13.9% | +10.3% | +5.3% | +3.4% | +2.8% | +1.1% | +1.8% | +18.5% | +12.1% |
| 2019 | — | — | — | — | — | — | −1.6% | −5.4% | −2.7% | +3.6% | +4.1% | +0.9% |
OBMCX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 24.72%
- 3-year Sharpe ratio: 1.04 (vs 4.5% risk-free rate)
- Best month: +23.13% (Apr 2026)
- Worst month: −10.75% (Oct 2023)
OBMCX Fund Flows
Monthly money in and out of Oberweis Micro-Cap Fund, from SEC Form N-PORT.
- 12-month net flow: $272.9M
- 12-month gross sales (incl. reinvestments): $554.7M
- Sales ÷ redemptions: 1.97×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $101.3M | $29.9M | $71.4M |
| May 2026 | $69.5M | $31.4M | $38.0M |
| Apr 2026 | $76.5M | $30.7M | $45.8M |
| Mar 2026 | $52.3M | $27.4M | $24.9M |
| Feb 2026 | $32.1M | $13.9M | $18.1M |
| Jan 2026 | $34.9M | $17.6M | $17.2M |
| Dec 2025 | $30.2M | $16.2M | $14.0M |
| Nov 2025 | $22.3M | $30.7M | −$8.5M |
| Oct 2025 | $44.4M | $24.7M | $19.7M |
| Sep 2025 | $35.6M | $26.9M | $8.6M |
| Aug 2025 | $29.4M | $17.2M | $12.3M |
| Jul 2025 | $26.3M | $15.1M | $11.2M |
OBMCX Assets Under Management
Net assets of Oberweis Micro-Cap Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $1.61B |
| 2026-03-31 | $1.05B |
| 2025-12-31 | $870.82M |
| 2025-09-30 | $868.51M |
| 2025-06-30 | $720.78M |
| 2025-03-31 | $593.90M |
| 2024-12-31 | $657.78M |
| 2024-09-30 | $591.90M |
| 2024-06-30 | $511.16M |
| 2024-03-31 | $475.31M |
| 2023-12-31 | $451.82M |
| 2023-09-30 | $398.23M |
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.