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Southeastern Asset Management

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An employee-owned American investment management firm best known for value-oriented portfolios and the Longleaf Partners funds.

Last updated August 25, 2026

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Overview

Southeastern Asset Management is an employee-owned investment management firm headquartered in Memphis, Tennessee. Founded in 1975 by O. Mason Hawkins, the firm developed a reputation for long-term, value-oriented investing across public equities. Its business combines separately managed accounts for institutional clients with the Longleaf Partners family of mutual funds and UCITS funds. The firm’s investment activities span four broad mandates: U.S. large-cap equities, U.S. small-cap equities, non-U.S. equities, and global equities. Southeastern’s institutional business represents the larger part of its assets, while the Longleaf product range gives individual and international investors access to strategies associated with the firm’s investment approach. According to information cited in the firm’s Wikipedia profile, approximately 60% of assets were held in separately managed institutional accounts and roughly 40% in Longleaf mutual and UCITS funds around the period described. The same reference reported approximately $6.9 billion in assets under management as of November 2022. Southeastern’s investment philosophy is centered on identifying businesses whose market prices are below the firm’s assessment of their intrinsic value. The approach generally emphasizes fundamental research, patient ownership, financial analysis, and the possibility of a margin of safety. This value-investing identity is reflected in both the firm’s institutional mandates and the Longleaf funds. The first Longleaf mutual fund was introduced in 1987, initially giving Southeastern employees a way to invest alongside clients. The Longleaf Partners Small-Cap Fund followed in 1989, targeting undervalued companies that were too small for the firm’s established portfolios. The product range later expanded internationally, with the Longleaf Partners International Fund launched in 1998 and the Longleaf Partners Global Fund in 2012. Southeastern also developed UCITS vehicles for non-U.S. investors, including a global fund in 2010 and a U.S. fund in 2012. Southeastern operates internationally through offices and investment activity beyond Memphis, including London, Singapore, and Sydney as reported in the company’s reference profile. Its leadership has included founder and chairman Mason Hawkins, president and chief investment officer Staley Cates, and chief executive officer Ross Glotzbach. The firm remains primarily identified with active, fundamental equity management rather than broad passive products, banking, or retail financial distribution.

History

Southeastern Asset Management was established in 1975 by O. Mason Hawkins, who had previously worked in investment research and investment management. From its beginning, the firm focused on fundamental analysis and value investing, seeking to acquire interests in companies whose market quotations appeared to be below the firm’s estimate of underlying business value. Its original U.S. investment mandate dates to the founding of the firm. In 1987, Southeastern introduced the Longleaf Partners Fund. The fund was created partly to allow employees to invest in the same types of securities managed for clients, and it became the foundation of the firm’s publicly distributed fund platform. The Longleaf Partners Small-Cap Fund was added in 1989 to address opportunities among smaller companies that did not fit the scale requirements of existing portfolios. That fund later closed to new investors in 1997 and remained closed according to the cited reference material. Southeastern expanded its institutional capabilities over time. Its non-U.S. mandate began in 1998, broadening the firm’s research beyond American companies. In 2000, it added a global separately managed account strategy that combined U.S. and non-U.S. holdings in one portfolio. These mandates complemented the firm’s continuing U.S. large-cap and small-cap activities and allowed institutional clients to select regional or global exposure. The Longleaf family also became more international. The Longleaf Partners International Fund was launched in 1998. To serve investors outside the United States, Southeastern created a global UCITS fund in 2010 and a U.S. UCITS fund in 2012. The Longleaf Partners Global Fund was also introduced in 2012, extending the range of strategies available through the mutual-fund platform. The firm’s business model has remained divided between institutional separately managed accounts and pooled investment vehicles. The reference profile describes approximately 60% of assets as being managed through institutional separate accounts and approximately 40% through Longleaf mutual and UCITS funds. As of November 2022, the same material reported approximately $6.9 billion in assets under management. The firm has been described as employee-owned and has maintained its headquarters in Memphis, with additional offices reported in London, Singapore, and Sydney. Leadership continuity has been a notable feature of Southeastern’s history. Hawkins remained associated with the firm as founder and chairman. Staley Cates joined in 1986 and became president in 1994, later serving as president and chief investment officer. Ross Glotzbach, who joined Southeastern in 2004, became chief executive officer on January 1, 2019. Across these changes, the firm continued to present itself as an active, research-driven manager organized around long-term value investing.

  • 2022

    Reported assets under management

    [1]

    The firm was reported to manage approximately $6.9 billion in assets as of November 2022.

  • 2019

    Ross Glotzbach became chief executive officer

    [1]

    Ross Glotzbach assumed the chief executive role after joining Southeastern in 2004.

  • 2012

    Global fund and U.S. UCITS fund expanded the platform

    [1]

    The Longleaf Partners Global Fund and a U.S. UCITS fund were launched, extending the firm’s international product offering.

  • 2010

    Global UCITS fund created

    [1]

    Southeastern established a global Longleaf UCITS vehicle for investors outside the United States.

  • 2000

    Global separate-account mandate created

    [1]

    The firm introduced a global institutional mandate combining U.S. and non-U.S. companies in a single portfolio.

  • 1998

    International investment expansion

    [1]

    Southeastern began its non-U.S. institutional mandate and launched the Longleaf Partners International Fund.

  • 1997

    Small-cap fund closed to new investors

    [1]

    The Longleaf Partners Small-Cap Fund closed to new investors and was reported as remaining closed thereafter.

  • 1989

    Longleaf Partners Small-Cap Fund launched

    [1]

    The firm added a small-cap fund aimed at undervalued companies that were too small for its existing portfolios.

  • 1987

    Longleaf Partners Fund launched

    [1]

    Southeastern introduced its first mutual fund, providing employees and other investors with access to the firm’s value-oriented equity strategy.

  • 1975

    Southeastern Asset Management founded

    [1]

    O. Mason Hawkins founded Southeastern Asset Management, establishing its U.S. investment management business.

Products and positioning

Employee-owned, fundamental value-oriented investment management for institutional and fund investors.

  • Mutual fund · 1987

    Longleaf Partners Fund

    Launched in 1987, the Longleaf Partners Fund is Southeastern’s foundational mutual-fund offering. It provides investors with access to the firm’s active, fundamental value-investing approach, generally emphasizing ownership of public companies considered undervalued relative to their long-term business prospects.

  • Mutual fund · 1989

    Longleaf Partners Small-Cap Fund

    Introduced in 1989, this strategy was designed for undervalued smaller companies that were too small for Southeastern’s existing portfolios. It closed to new investors in 1997 and was reported as remaining closed, making it an important historical product even though its availability is restricted.

  • Mutual fund · 1998

    Longleaf Partners International Fund

    Launched in 1998, the International Fund extended Southeastern’s value-oriented equity approach beyond the United States. It was part of the firm’s broader expansion into non-U.S. research and institutional investment mandates.

  • Mutual fund · 2012

    Longleaf Partners Global Fund

    Introduced in 2012, the Global Fund combines investment opportunities from U.S. and non-U.S. markets within a single Longleaf strategy, reflecting Southeastern’s global equity capabilities.

  • UCITS funds · 2010

    Longleaf Partners UCITS Funds

    Southeastern created UCITS vehicles to make selected Longleaf strategies available to investors outside the United States. The cited history identifies a global UCITS fund created in 2010 and a U.S. UCITS fund launched in 2012.

  • Institutional investment management · 1975

    Separately Managed Accounts

    Separately managed accounts form the larger part of Southeastern’s business. The firm offers institutional mandates covering U.S., non-U.S., and global equities, with the global strategy combining American and international companies in one portfolio.

Brand decisions

  • 2012

    Expansion of global fund productsProduct launch

    Background

    Southeastern continued developing products for both global investors and investors seeking U.S. equity exposure through international fund structures.

    Action taken

    The firm launched the Longleaf Partners Global Fund and a U.S. UCITS fund.

    Aftermath

    The additions expanded the geographic range of the Longleaf platform.

  • 2010

    Launch of global UCITS vehicleProduct launch

    Background

    Investors outside the United States required internationally distributable fund structures.

    Action taken

    Southeastern created a global Longleaf UCITS fund.

    Aftermath

    The product broadened access to Southeastern’s global strategy in non-U.S. markets.

  • 2000

    Creation of a global institutional mandateStrategy

    Background

    Institutional investors needed a strategy capable of investing across U.S. and international markets.

    Action taken

    Southeastern created a global separately managed account mandate combining U.S. and non-U.S. companies.

    Aftermath

    The global mandate complemented the firm’s regional U.S. and non-U.S. offerings.

  • 1998

    International strategy expansionStrategy

    Background

    Southeastern sought to broaden its value-investing capabilities beyond U.S. equities.

    Action taken

    The firm introduced a non-U.S. institutional mandate and the Longleaf Partners International Fund.

    Aftermath

    International equities became a continuing part of both the institutional and pooled-fund businesses.

  • 1989

    Expansion into small-cap value investingProduct launch

    Background

    Some undervalued businesses were too small to fit within Southeastern’s existing portfolios.

    Action taken

    Southeastern seeded the Longleaf Partners Small-Cap Fund.

    Aftermath

    The fund later closed to new investors in 1997 and remained closed according to the cited reference.

  • 1987

    Creation of the first Longleaf mutual fundProduct launch

    Background

    Southeastern wanted employees to be able to invest in the same funds managed for clients.

    Action taken

    The firm launched the Longleaf Partners Fund as its first mutual-fund product.

    Aftermath

    The fund became the base of a broader Longleaf mutual-fund and UCITS platform.

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