The Oakmark Funds are advised by Harris Associates L.P. an autonomous subsidiary of Natixis Investment Managers, L.P.

Learn more about the principles and philosophy behind our funds at

Harris Associates

111 South Wacker Drive, Suite 4600
Chicago, Illinois 60606

John Sitarz portrait

John A. Sitarz, CFA, CPA

Partner and Portfolio Manager

John Sitarz has been a manager for the Oakmark Global Fund and the Oakmark Global Select Fund since 2022. He is also an investment analyst at Harris Associates and a vice president of the Oakmark Funds.

He joined Harris Associates in 2013. During his time at the firm, he has served as a research associate and assistant. Prior to that he was an audit senior assistant at Deloitte & Touche.

Mr. Sitarz earned B.S. degrees in accounting and business administration from the University of Denver (2012).

Funds under management


Oakmark Global Fund: Fourth Quarter 2022

December 31, 2022

There were two great lessons in the difficulty of predictions this year. First, professional market forecasters nailed their call on aggregate company fundamentals, but failed miserably at guessing the resulting stock prices. The second...

Oakmark Global Select Fund: Fourth Quarter 2022

December 31, 2022

A top contributor to the Fund’s performance was the largest operator of for-profit hospitals and related health care services in the U.S., while a top detractor was a U.S.-based global leader in e-commerce and...

Oakmark Global Fund: Third Quarter 2022 and Fiscal Year-End

September 30, 2022

We believe the Global Fund’s diversification is a key attribute. Although our portfolio is diversified, we limit the number of holdings in the Fund so that it represents what we believe to be a...

We do value investing differently

At Oakmark, we don’t have an opinion about how equities will perform this year, if a recession will start or if the political parties will produce pro-growth candidates for 2020. As long-term investors, we don’t think it matters.