Investment Objective

The Fund seeks long-term capital appreciation.

Investment Strategy

The Opportunity Fund is a small cap growth mutual fund that invests primarily in companies that the Osterweis Capital Management investment team believes are likely to experience strong revenue growth and rising profitability. In selecting investments, we seek to identify lesser-known, quality businesses with long runways for organic expansion. Our holdings tend to be early-stage, small cap companies that have discovered a fundamental change/innovation within their industries that creates a lasting competitive advantage.


  • Focus on innovative, emerging companies with differentiated product offerings
  • Invest in businesses experiencing strong secular growth
  • Maintain strict valuation discipline to help manage risk
  • Invest in only our best ideas
  • Leverage decades of investment experience

Minimum Investments

  • $5,000 initial investment for regular accounts
  • $1,500 initial investment for IRA or other tax-deferred accounts
  • $100 for subsequent investments

NAV as of 7/24/24

Price $16.47 Change $-0.40

Fund Facts

Ticker OSTGX
CUSIP 74316P744
Inception Date 10/1/2012
Load None
12b-1 Fees None
Redemption Fee None
Net Assets
(as of 6/30/24)
$328 million
Fiscal Year Turnover
(as of 3/31/24)
Net Expense Ratio
(as of 3/31/24)
Gross Expense Ratio
(as of 3/31/24)
Active Share (as of 6/30/24) 94%


We believe the best way to generate long-term outperformance is to build a high conviction portfolio of quality small cap growth companies with increasing revenues and rising profitability.

We define “quality” as companies with the following four characteristics: (1) a distinct proprietary advantage; (2) a leading position in the industry; (3) potential for margin expansion; and (4) the presence of a strong management team.

Valuation discipline is a critical component of our approach. At entry, we look for opportunities with at least 100% potential upside using an industry-appropriate multiple that does not exceed 30x P/E for companies that we believe fit our portfolio. This not only helps us to identify faster-growing companies that we believe are potentially breaking new barriers in their respective industries but plays an important role in managing portfolio risk.

Investment Team

James Callinan, CFA

Chief Investment Officer – Small Cap Growth

James Callinan, CFA

Chief Investment Officer – Small Cap Growth

Jim Callinan was the Co-Founder & Chief Investment Officer at RS Investments. He also co-founded the RS Growth Group LLC in 1996 and managed the RS Emerging Growth Fund from 1996 until 2010. In 1999 Mr. Callinan was named Morningstar’s Domestic Stock Manager of the Year.*

He served as portfolio manager for the Putnam OTC Emerging Growth Fund from 1994 to 1996 and began his career at Putnam Investments as an equity research analyst in 1987. He joined Osterweis Capital Management in 2016 and brought with him the Emerging Growth Partners, LP, a concentrated small cap growth strategy he founded at RS in 2006.

Mr. Callinan is a member of the Weatherbie Capital Advisory Board.

He is an equity owner in the firm and the Lead Portfolio Manager for the small cap growth strategy.

Mr. Callinan graduated from Harvard College (B.A. in Economics), New York University (M.S. in Accounting) and Harvard Business School (M.B.A.). Mr. Callinan holds the CFA designation.

*Morningstar Managers of the Year are determined by a combination of qualitative research by Morningstar’s manager research analysts; risk-adjusted medium- to long-term performance track records; and performance in the calendar year.

Matt Unger, CFA

Vice President & Portfolio Manager - Small Cap Growth

Matt Unger, CFA

Vice President & Portfolio Manager - Small Cap Growth

Prior to joining Osterweis Capital Management in 2016, Matt Unger spent three years at RS Investments as a Research Associate covering small cap growth companies in the medical technology and industrial sectors. Before graduate school, Matt worked at Platte River Capital covering the medical device sector from 2008-2010.

He is an equity owner in and principal of the firm and a Portfolio Manager for the small cap growth strategy.

Mr. Unger graduated from Trinity University (B.S. in Finance, cum laude) and Southern Methodist University, Cox School of Business (M.B.A.). Mr. Unger holds the CFA designation.

Bryan Wong, CFA

Vice President & Portfolio Manager - Small Cap Growth

Bryan Wong, CFA

Vice President & Portfolio Manager - Small Cap Growth

Prior to joining Osterweis Capital Management in 2014, Bryan Wong was a member of the investment team managing the endowment of the David and Lucile Packard Foundation. Before that, Mr. Wong was an Analyst at Wohl Capital Management, a long/short hedge fund.

He is an equity owner in and a principal of the firm and a Portfolio Manager for the small cap growth strategy.

Mr. Wong serves on the investment committee of the Asian Pacific Fund.

Mr. Wong graduated from Yale University (B.A. in Political Science and International Studies with distinction) and the University of California Berkeley, Haas School of Business (M.B.A., Investment Management Fellow). He holds the CFA designation and is a member of the CFA Society of San Francisco.

Jamie Wolf, CFA

Research Analyst - Small Cap Growth

Jamie Wolf, CFA

Research Analyst - Small Cap Growth

Prior to joining Osterweis Capital Management in 2023, Jamie Wolf was an Equity Analyst at Invesco LTD covering small, mid, and large cap companies in the consumer sector. Before that, he worked at Haverford Trust Company as a Senior Research Analyst.

Mr. Wolf is a Research Analyst for the small cap growth strategy.

He is a member of the Value Investor Club, LA CFA Society, and American Chemical Society.

Mr. Wolf graduated from Franklin and Marshall College (B.A. in Chemistry and Economics) and UCLA Anderson School of Management (M.B.A.). He holds the CFA designation.

The Adviser has contractually agreed to waive certain fees through June 30, 2025. The net expense ratio is applicable to investors.

The Osterweis Funds are available by prospectus only. The Funds’ investment objectives, risks, charges and expenses must be considered carefully before investing. The summary and statutory prospectuses contain this and other important information about the Funds. You may obtain a summary or statutory prospectus by calling toll free at (866) 236-0050, or by visiting Please read the prospectus carefully before investing to ensure the Fund is appropriate for your goals and risk tolerance.

Mutual fund investing involves risk. Principal loss is possible.

The Osterweis Opportunity Fund may invest in unseasoned companies, which involve additional risks such as abrupt or erratic price movements. The Fund may invest in small and mid-sized companies, which may involve greater volatility than large-sized companies. The Fund may invest in IPOs and unseasoned companies that are in the early stages of their development and may pose more risk compared to more established companies. The Fund may invest in ETFs, which involve risks that do not apply to conventional funds. Higher turnover rates may result in increased transaction costs, which could impact performance. From time to time, the Fund may have concentrated positions in one or more sectors subjecting the Fund to sector emphasis risk. The Fund may invest in foreign and emerging market securities, which involve greater volatility and political, economic and currency risks and differences in accounting methods. These risks may increase for emerging markets.

While the fund is no-load, management fees and other expenses still apply. Please refer to the prospectus for more information.

Osterweis Capital Management is the adviser to the Osterweis Funds, which are distributed by Quasar Distributors, LLC.