The Longleaf Partners International Fund was managed by Southeastern Asset Management, Inc., an employee-owned global investment management firm founded in 1975 by O. Mason Hawkins. The fund operated from October 26, 1998, until December 19, 2025, when it was merged into the Longleaf Partners Global Fund. Under the leadership of Chairman O. Mason Hawkins (who received Institutional Investor's Lifetime Achievement Award in 2005) and CEO Ross Glotzbach, the fund maintained approximately $573 million in net assets and delivered strong performance including +21.7% year-to-date returns through Q3 2025. The fund was officially closed following shareholder approval of the merger on December 18, 2025.

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Southeastern Asset Management follows a value-oriented, long-term, bottom-up stock selection process. The firm views equity investments as ownership in a business enterprise, requiring companies to trade at 60% or less of appraisal value to qualify for investment. The International Fund normally invested at least 65% of total assets in equity securities of non-U.S. issuers, maintaining a concentrated portfolio of 18-22 best ideas with a 3-5 year investment horizon. Portfolio turnover is generally less than 50%, emphasizing partnerships with companies exhibiting strong businesses, prudent capital allocation by trustworthy management, and purchasable at meaningful discounts to intrinsic value.

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