OSTGX Performance — Osterweis Opportunity Fund, Investor Class
Data updated: 2026-08-21
OSTGX returned +30.24% year to date and +41.39% over one year to Jun 2026. Annualised returns are +18.24% over 3 years and +5.05% over 5 years. The fund beat its US Small Growth category average: $100 invested three years ago grew to $165, against $156 for the category, and to $141 over one year, against $132. Volatility over the past three years was 19.47% a year. In the 12 months to Jun 2026 the fund lost a net $42.6M, and assets reached $382.66M.
OSTGX Growth of $100
What $100 invested in Osterweis Opportunity 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 | OSTGX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $141 | $132 |
| 3 years (Jul 2023 – Jun 2026) | $165 | $156 |
| 5 years (Jul 2021 – Jun 2026) | $128 | $127 |
| Since data start (Jul 2019 – Jun 2026) | $247 | $203 |
OSTGX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +30.24% |
| 1 year | +41.39% |
| 3 years (annualised) | +18.24% |
| 5 years (annualised) | +5.05% |
OSTGX Annual Returns
Calendar-year total returns of Osterweis Opportunity Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +30.24% |
| 2025 | +0.26% |
| 2024 | +22.49% |
| 2023 | +23.98% |
| 2022 | −33.00% |
| 2021 | +3.95% |
| 2020 | +83.23% |
| 2019 (Jul–Dec) | −2.33% |
OSTGX 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 | +3.2% | −0.2% | −6.6% | +10.7% | +8.7% | +12.4% | — | — | — | — | — | — |
| 2025 | +1.6% | −9.1% | −7.8% | −1.6% | +5.2% | +4.8% | +1.9% | +4.8% | −1.5% | +1.6% | +1.8% | −0.1% |
| 2024 | −0.9% | +8.3% | +4.5% | −3.3% | +5.4% | +0.9% | +3.2% | +4.4% | +1.6% | −2.4% | +8.1% | −7.9% |
| 2023 | +9.2% | +0.3% | +0.4% | −1.1% | +0.2% | +10.0% | +1.1% | −3.3% | −5.7% | −6.4% | +10.1% | +8.7% |
| 2022 | −14.4% | −3.8% | −0.4% | −10.3% | −4.9% | −6.2% | +9.7% | −2.2% | −7.5% | +6.1% | +3.1% | −6.1% |
| 2021 | +2.1% | +3.8% | −6.2% | +6.9% | −3.8% | +5.7% | −0.3% | −0.7% | −1.6% | +6.6% | −7.5% | +0.2% |
| 2020 | +5.4% | −2.7% | −16.0% | +19.7% | +18.8% | +2.6% | +8.6% | +3.6% | +0.9% | +4.0% | +15.6% | +6.7% |
| 2019 | — | — | — | — | — | — | +4.7% | −5.8% | −6.4% | +0.2% | +6.0% | −0.3% |
OSTGX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 19.47%
- 3-year Sharpe ratio: 0.71 (vs 4.5% risk-free rate)
- Best month: +12.44% (Jun 2026)
- Worst month: −9.12% (Feb 2025)
OSTGX Fund Flows
Monthly money in and out of Osterweis Opportunity Fund, from SEC Form N-PORT.
- 12-month net flow: −$42.6M
- 12-month gross sales (incl. reinvestments): $36.7M
- Sales ÷ redemptions: 0.46×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $1.5M | $3.0M | −$1.5M |
| May 2026 | $2.3M | $3.5M | −$1.3M |
| Apr 2026 | $2.1M | $4.6M | −$2.5M |
| Mar 2026 | $2.2M | $3.1M | −$835K |
| Feb 2026 | $1.5M | $5.2M | −$3.7M |
| Jan 2026 | $2.5M | $6.6M | −$4.1M |
| Dec 2025 | $8.7M | $5.4M | $3.3M |
| Nov 2025 | $1.3M | $5.3M | −$4.0M |
| Oct 2025 | $3.0M | $14.9M | −$11.9M |
| Sep 2025 | $2.1M | $8.8M | −$6.7M |
| Aug 2025 | $4.2M | $3.0M | $1.2M |
| Jul 2025 | $5.3M | $16.0M | −$10.7M |
OSTGX Assets Under Management
Net assets of Osterweis Opportunity Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $382.66M |
| 2026-03-31 | $287.39M |
| 2025-12-31 | $306.92M |
| 2025-09-30 | $316.78M |
| 2025-06-30 | $317.09M |
| 2025-03-31 | $353.36M |
| 2024-12-31 | $422.62M |
| 2024-09-30 | $387.80M |
| 2024-06-30 | $328.50M |
| 2024-03-31 | $264.12M |
| 2023-12-31 | $226.37M |
| 2023-09-30 | $193.85M |
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.