OBIOX Performance — Oberweis International Opportunities Fund, Investor Class
Data updated: 2026-08-28
OBIOX returned +8.32% year to date and +12.61% over one year to Jun 2026. Annualised returns are +15.54% over 3 years and −0.78% over 5 years. Against its International Mid-Cap Growth category average the fund came out ahead over three years but behind over one: $100 invested three years ago grew to $154, against $147 for the category, and to $113 over one year, against $115. Volatility over the past three years was 17.06% a year. In the 12 months to Jun 2026 the fund lost a net $35.8M, and assets reached $409.22M.
OBIOX Growth of $100
What $100 invested in Oberweis International Opportunities Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the International Mid-Cap Growth category average over the same months.
| Period | OBIOX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $113 | $115 |
| 3 years (Jul 2023 – Jun 2026) | $154 | $147 |
| 5 years (Jul 2021 – Jun 2026) | $96 | $129 |
| Since data start (Jul 2019 – Jun 2026) | $171 | $183 |
OBIOX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +8.32% |
| 1 year | +12.61% |
| 3 years (annualised) | +15.54% |
| 5 years (annualised) | −0.78% |
OBIOX Annual Returns
Calendar-year total returns of Oberweis International Opportunities Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +8.32% |
| 2025 | +30.71% |
| 2024 | +7.54% |
| 2023 | +4.89% |
| 2022 | −37.06% |
| 2021 | +1.52% |
| 2020 | +62.86% |
| 2019 (Jul–Dec) | +3.03% |
OBIOX 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 | +4.2% | +7.0% | −12.5% | +11.1% | +2.5% | −2.4% | — | — | — | — | — | — |
| 2025 | +3.1% | +0.6% | +0.5% | +5.7% | +8.1% | +5.7% | −0.2% | +4.4% | +0.5% | −1.5% | −0.1% | +0.9% |
| 2024 | −0.5% | +3.1% | +3.8% | −3.8% | +7.0% | −4.3% | +6.4% | +1.4% | +1.2% | −4.7% | +1.0% | −2.4% |
| 2023 | +8.3% | −1.8% | −1.1% | −1.1% | −5.0% | +4.7% | +0.7% | −1.6% | −5.6% | −7.0% | +9.7% | +6.1% |
| 2022 | −11.5% | −6.4% | −0.7% | −10.5% | +0.6% | −14.4% | +10.1% | −8.9% | −12.6% | +7.5% | +9.5% | −3.6% |
| 2021 | −3.6% | +2.3% | +0.4% | +6.4% | +0.9% | −0.1% | +1.0% | +3.5% | −4.9% | −0.7% | −3.9% | +0.8% |
| 2020 | −1.8% | −7.6% | −17.3% | +16.0% | +17.4% | +9.2% | +5.9% | +8.9% | +2.7% | +0.2% | +13.3% | +8.6% |
| 2019 | — | — | — | — | — | — | −0.7% | −5.0% | +1.2% | +3.1% | +1.7% | +3.0% |
OBIOX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 17.06%
- 3-year Sharpe ratio: 0.65 (vs 4.5% risk-free rate)
- Best month: +11.06% (Apr 2026)
- Worst month: −12.53% (Mar 2026)
OBIOX Fund Flows
Monthly money in and out of Oberweis International Opportunities Fund, from SEC Form N-PORT.
- 12-month net flow: −$35.8M
- 12-month gross sales (incl. reinvestments): $37.2M
- Sales ÷ redemptions: 0.51×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $1.0M | $9.1M | −$8.1M |
| May 2026 | $3.8M | $2.7M | $1.1M |
| Apr 2026 | $2.2M | $2.3M | −$100K |
| Mar 2026 | $1.9M | $22.2M | −$20.3M |
| Feb 2026 | $13.0M | $5.9M | $7.1M |
| Jan 2026 | $1.3M | $2.4M | −$1.2M |
| Dec 2025 | $6.1M | $4.6M | $1.5M |
| Nov 2025 | $1.1M | $2.7M | −$1.7M |
| Oct 2025 | $654K | $4.8M | −$4.2M |
| Sep 2025 | $1.9M | $3.5M | −$1.7M |
| Aug 2025 | $3.1M | $6.6M | −$3.4M |
| Jul 2025 | $1.2M | $6.2M | −$5.0M |
OBIOX Assets Under Management
Net assets of Oberweis International Opportunities Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $409.22M |
| 2026-03-31 | $374.56M |
| 2025-12-31 | $398.72M |
| 2025-09-30 | $409.80M |
| 2025-06-30 | $401.28M |
| 2025-03-31 | $341.99M |
| 2024-12-31 | $341.62M |
| 2024-09-30 | $366.45M |
| 2024-06-30 | $343.88M |
| 2024-03-31 | $351.03M |
| 2023-12-31 | $393.97M |
| 2023-09-30 | $116.79M |
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.