OSTFX — Osterweis Fund
Data updated: 2026-08-21
OSTFX — Osterweis Fund. United States Large Cap Value Equity · $148.40M AUM · 0.94% expense ratio. Holdings, fees, performance and SEC filings.
OSTFX Fund Overview
OSTFX — Osterweis Fund is a US mutual fund managed by Professionally Managed Portfolios, categorised as United States Large Cap Value Equity. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Professionally Managed Portfolios
- Category: United States Large Cap Value Equity
- Assets under management: $148.40M
- 1-year return: 14.1%
- Ticker: OSTFX
- SEC CIK: 0000811030
- SEC series ID: S000004931
- Share class ID: C000013346
OSTFX Holdings
Top 10 holdings of Osterweis Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Alphabet Inc | 8.30% |
| Apple Inc | 4.63% |
| Applied Materials Inc | 4.27% |
| Amazon.com Inc | 4.23% |
| Analog Devices Inc | 3.80% |
| Visa Inc | 3.76% |
| Broadcom Inc | 3.74% |
| NVIDIA Corp | 3.67% |
| Microsoft Corp | 3.60% |
| JPMorgan Chase & Co | 3.45% |
OSTFX Portfolio Allocation
Asset-class allocation of Osterweis Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Equity | 97.8% |
| Cash & Equivalents | 2.2% |
OSTFX Performance
Total returns for OSTFX (as of 2026-09-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 5.8% |
| 1 year | 14.1% |
| 3 years (annualised) | 13.9% |
| 5 years (annualised) | 6.7% |
OSTFX Risk Information
Risk metrics for OSTFX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 13.0%
OSTFX Costs and Fees
OSTFX costs about $94 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.94%
- Gross expense ratio: 0.94%
- Portfolio turnover: 42%
- Brokerage commissions: 2.31 bps of average net assets (SEC N-CEN)
OSTFX Cashflows
Over the 12 months to 2026-06, Osterweis Fund had net outflows of $14.26M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | −$178.59K |
| 2026-05 | −$393.56K |
| 2026-04 | $302.23K |
| 2026-03 | −$417.07K |
| 2026-02 | −$6.74M |
| 2026-01 | −$847.18K |
OSTFX Debt Constituents
No individual debt constituents are reported in Osterweis Fund's latest SEC N-PORT filing.
OSTFX Prospectus and SEC Filings
Official Osterweis Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-06-30
- Prospectus (485BPOS) — filed 2025-06-27
- Prospectus (485BPOS) — filed 2024-06-28
- Portfolio holdings (N-PORT) — filed 2026-08-21
- Portfolio holdings (N-PORT) — filed 2026-05-28
- Portfolio holdings (N-PORT) — filed 2026-02-18
- Annual census (N-CEN) — filed 2026-06-11
- Annual census (N-CEN) — filed 2025-06-10
Related Funds
Other United States Large Cap Value Equity funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.