OSTFX Performance — Osterweis Fund, Investor Class
Data updated: 2026-08-21
OSTFX returned +5.83% year to date and +14.07% over one year to Jun 2026. Annualised returns are +13.92% over 3 years and +6.71% over 5 years. The fund trailed its US Large Value category average: $100 invested three years ago grew to $148, against $158 for the category, and to $114 over one year, against $121. Volatility over the past three years was 12.86% a year. In the 12 months to Jun 2026 the fund lost a net $14.3M, and assets reached $148.40M.
OSTFX Growth of $100
What $100 invested in Osterweis Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the US Large Value category average over the same months.
| Period | OSTFX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $114 | $121 |
| 3 years (Jul 2023 – Jun 2026) | $148 | $158 |
| 5 years (Jul 2021 – Jun 2026) | $138 | $165 |
| Since data start (Jul 2019 – Jun 2026) | $213 | $223 |
OSTFX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +5.83% |
| 1 year | +14.07% |
| 3 years (annualised) | +13.92% |
| 5 years (annualised) | +6.71% |
OSTFX Annual Returns
Calendar-year total returns of Osterweis Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +5.83% |
| 2025 | +12.86% |
| 2024 | +13.38% |
| 2023 | +22.64% |
| 2022 | −21.89% |
| 2021 | +19.30% |
| 2020 | +23.13% |
| 2019 (Jul–Dec) | +11.91% |
OSTFX 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 | +1.5% | +0.8% | −6.9% | +10.2% | −0.1% | +0.9% | — | — | — | — | — | — |
| 2025 | +4.1% | −2.8% | −4.4% | −1.7% | +5.8% | +4.0% | +1.5% | +1.3% | +1.3% | +1.2% | +3.1% | −0.8% |
| 2024 | +2.0% | +4.3% | +3.4% | −4.7% | +2.8% | +2.4% | +1.2% | +1.2% | +0.9% | −2.6% | +4.4% | −2.4% |
| 2023 | +5.6% | −2.5% | +3.2% | +0.6% | 0.0% | +5.0% | +2.8% | −1.5% | −5.2% | −1.0% | +10.0% | +4.3% |
| 2022 | −7.2% | −1.5% | +1.0% | −8.9% | −1.0% | −6.0% | +7.1% | −4.1% | −8.3% | +4.4% | +6.9% | −5.1% |
| 2021 | −1.6% | +3.5% | +2.6% | +5.1% | −0.1% | +1.9% | +1.4% | +2.0% | −4.8% | +6.9% | −2.2% | +3.6% |
| 2020 | +2.2% | −6.6% | −12.2% | +11.7% | +5.3% | +0.2% | +7.2% | +4.3% | −1.6% | −0.2% | +10.1% | +3.1% |
| 2019 | — | — | — | — | — | — | +2.4% | +1.3% | +0.7% | +1.0% | +3.5% | +2.4% |
OSTFX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 12.86%
- 3-year Sharpe ratio: 0.73 (vs 4.5% risk-free rate)
- Best month: +10.18% (Apr 2026)
- Worst month: −6.88% (Mar 2026)
OSTFX Fund Flows
Monthly money in and out of Osterweis Fund, from SEC Form N-PORT.
- 12-month net flow: −$14.3M
- 12-month gross sales (incl. reinvestments): $13.5M
- Sales ÷ redemptions: 0.49×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $248K | $426K | −$179K |
| May 2026 | $1.1M | $1.5M | −$394K |
| Apr 2026 | $886K | $584K | $302K |
| Mar 2026 | $305K | $722K | −$417K |
| Feb 2026 | $213K | $7.0M | −$6.7M |
| Jan 2026 | $465K | $1.3M | −$847K |
| Dec 2025 | $8.8M | $2.2M | $6.6M |
| Nov 2025 | $70K | $8.3M | −$8.2M |
| Oct 2025 | $667K | $1.4M | −$707K |
| Sep 2025 | $49K | $1.6M | −$1.6M |
| Aug 2025 | $410K | $1.9M | −$1.5M |
| Jul 2025 | $265K | $953K | −$688K |
OSTFX Assets Under Management
Net assets of Osterweis Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $148.40M |
| 2026-03-31 | $133.90M |
| 2025-12-31 | $148.37M |
| 2025-09-30 | $153.86M |
| 2025-06-30 | $151.44M |
| 2025-03-31 | $142.70M |
| 2024-12-31 | $151.03M |
| 2024-09-30 | $155.74M |
| 2024-06-30 | $151.74M |
| 2024-03-31 | $157.49M |
| 2023-12-31 | $146.60M |
| 2023-09-30 | $133.18M |
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.