William Blair & Company, L.L.C.

What does William Blair own?

William Blair operates investment banking, private wealth management, and institutional asset management under the unified William Blair brand. It owns no separate subsidiary brands.

Is William Blair publicly traded?

No. William Blair is 100 percent employee-owned and private. It has never issued public shares and maintains its partnership structure as a core part of its identity.

Who founded William Blair?

William McCormick Blair founded the firm in 1935 in Chicago after leaving McGraw-Hill. He built it into the city's premier regional investment bank before it expanded nationally and internationally.

Where is William Blair headquartered?

William Blair is headquartered in Chicago, Illinois, in the William Blair building at 150 North Riverside Plaza, with offices across North America, Europe, and Asia.

How many brands does William Blair own?

The firm operates under the single William Blair brand across its three businesses: investment banking, private wealth management, and William Blair Investment Management.

Who owns William Blair?

The firm is 100 percent employee-owned by its active partners and staff. No outside investors or public shareholders hold equity, and partners sell their interests back to the firm upon departure.

What is William Blair known for?

William Blair is known for middle-market investment banking leadership, its employee-ownership model, and 90 years of independence as one of the last major private investment banks in the United States.

William McCormick Blair founded the firm in 1935 in Chicago, leaving his position at the financial publisher McGraw-Hill to start a securities firm at the depths of the Great Depression. He built it on relationships and research quality, establishing the institutional culture that persists.

The firm grew as Chicago's premier regional investment bank through the mid-twentieth century, underwriting Midwest companies and building its research reputation. It expanded into asset management in the 1960s and 1970s and established its private wealth business, diversifying beyond transactional banking into recurring fee businesses.

International expansion defined the modern firm. It opened offices in London, Frankfurt, Zurich, and Asia, turning a regional bank into a global boutique with particular strength in cross-border middle-market transactions. Its investment bank became a consistent leader in middle-market M&A league tables.

The firm has never sold, gone public, or merged. Leadership has passed through a small number of partners: founder William Blair, then Edgar Jannotta, John Ettelson, and since 2022 Brent Gledhill as president and CEO. The firm marked its 90th anniversary in 2025 as one of the last major independent investment banks, with client assets of approximately $70 billion.

The firm publishes corporate responsibility reporting covering its employee-ownership culture, community investment, and ESG integration in its investment processes. Its asset management arm offers responsible investment strategies, and its private ownership structure is itself presented as a governance model aligned with long-term client interests.

William Blair consistently ranks at the top of middle-market M&A league tables and is regularly named among the best investment banks and asset managers to work for. Its research analysts earn frequent Institutional Investor and industry rankings, and its asset management funds receive consistent top-tier ratings. The firm's 90-year independence is itself regularly cited in industry profiles.

William Blair carries no defining public scandal. Its regulatory posture is the ordinary burden of a registered broker-dealer and investment adviser. Its independence means it avoids the conflicts of interest that generate enforcement actions at banks combining lending and advisory, and its long private history has produced a reputation for institutional integrity rather than controversy.