Chicago skyline silhouette at dusk with Willis Tower - The Largest Family Offices in Illinois

The 10 Largest Family Offices in Illinois (2026)

Subscribe to continue reading

Here are ten of the largest family offices in Illinois from our database - offices managing the wealth of billionaire families and major 13F filers - along with their websites:

  1. William Harris Investors (Chicago)
    William Harris Investors is a privately owned investment and wealth management firm serving as the multi-family office for the Irving B. Harris family. Founded in 1976 by Irving B. Harris to manage his own family's capital, the firm now provides investment and wealth management services to four generations of the Harris family.
  2. Hoffmann Family of Companies (Winnetka)
    The Hoffmann Family of Companies is a multi-vertical, family-owned and multi-generational family business. It partners with management teams that share its focus on customer and employee experience to create and sustain value for both stakeholders.
  3. Pritzker Group (Chicago)
    Pritzker Group is the investment firm founded by Tony and J.B. Pritzker, comprising three professional teams spanning middle-market acquisitions, technology venture capital and asset management. Its permanent capital base, unlike traditional private equity and venture capital structures, allows alignment with management teams, efficient decision-making and flexible transaction structures.
  4. Horizon Family Wealth (Chicago)
    Horizon Family Wealth is a Chicago-based multi-family and high-net-worth wealth management firm registered with the SEC. It provides discretionary portfolio management and comprehensive wealth planning to a select group of families nationally.
  5. Stenger Family Office (Naperville)
    Stenger Family Office is a Naperville, Illinois fiduciary wealth management firm operating as a multi-family office. Since 1981 it has provided financial planning, investment management, tax strategy and estate planning to families across the United States.
  6. Oak Family Advisors (Chicago)
    Oak Family Advisors is an independent, fee-only, fiduciary wealth-planning firm built around its clients. It offers investment management, financial planning, estate planning and retirement planning.
  7. Altman Advisors (Chicago)
    Altman Advisors is an independent, fiduciary, employee-owned multi-family office established in 2016, though its founders and team have worked together for over 50 years. It provides multi-family office and asset management services focused on intergenerational wealth growth, preservation and transfer, with more than 90% of clients engaging across multiple generations.
  8. PSP Partners (Chicago)
    PSP Partners is the single family office of Penny Pritzker, investing in long-term businesses and real estate.
  9. The Pritzker Organization (Chicago)
    The Pritzker Organization has used its capital to found, acquire and build hundreds of companies alongside partners and management teams for over 60 years. It is the merchant bank for the business interests of the Tom Pritzker family, pursuing both control and non-control situations across industrials, business services, technology, infrastructure, healthcare and logistics.
  10. Council Ring Capital (Chicago)
    Council Ring Capital is a Chicago-based, multi-strategy investment firm affiliated with a single family. It leverages a permanent capital base to make long-term investments in publicly traded companies, privately held or sponsor-backed companies, and partnerships with third-party investment funds, concentrating on a select number of deeply researched ideas.

For more information and listings of active family offices:

Back to blog