Who We Are
AT A GLANCE
$69.0 billion
total assets under management
32% of our AUM
is from clients with multiple strategies
28 of 83
portfolio managers/analysts are partners
31 countries
in which we have clients
26 years
average industry experience for portfolio managers
9.7 years
average client tenure
All data as of 09/30/2025
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Learn more about what makes William Blair Investment Management unique.
A Recognized Workplace
William Blair Named One of the Top Workplaces in Chicago for 2025
William Blair was named one of Chicago’s Top Workplaces for 2025 by the Chicago Tribune on November 5.
Vivian Lin Thurston Named a P&I Most Influential Woman in Institutional Investing
Vivian Lin Thurston, CFA, partner, portfolio manager, has been named a Pensions & Investments 2024 Most Influential Women in Institutional Investing.
Ward Sexton and Dan Crowe Named to Euro Stars 2024
Ward Sexton, CFA, partner, and Dan Crowe, CFA, partner, both portfolio managers, have been listed among Europe’s top fund managers in Citywire’s Euro Stars 2024 list.
Our investment teams are committed to delivering results across strategies such as global equity, U.S. growth and core equity, U.S. value equity, and emerging markets debt.
We provide access through multiple vehicles, including separately managed accounts, collective investment trusts, mutual funds, and Luxembourg-domiciled UCITS funds.
Our investment teams are focused on active management across a wide range of strategies: global equity, growth and core equity, value equity, and emerging markets debt.
We offer a range of vehicles, including separately managed accounts, collective investment trusts, mutual funds, and Luxembourg-domiciled UCITS funds.
We serve consultants, foundations and endowments, public funds, corporations, Taft-Hartley plans, financial institutions, and financial advisors.
Institutional Client Breakdown
All data as of September 30, 2025. Numbers may not equal 100% due to rounding.
Culture is more than the ethos that characterizes our organization; it’s the engine that guides our practices. Our people are defined by their shared values and curiosity. Our approach is defined by teamwork; a disciplined, proven methodology; and technology-enhanced collaboration. Our purpose is defined by a focus on our clients and communities. But don’t take our word for it. See what culture means to our colleagues.
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As of 9/30/2025
Any investment or strategy mentioned herein may not be appropriate for every investor. There can be no assurance that investment objectives will be met. Products and services listed are available only to residents of this jurisdiction and may only be available to certain categories of investors. The information on this website does not constitute an offer for products or services, or a solicitation of an offer to any persons outside of this jurisdiction who are prohibited from receiving such information under applicable laws and regulations. Nothing on this webpage should be construed as advice and is therefore not a recommendation to buy or sell shares.
Please carefully consider the William Blair Funds’ investment objectives, risks, charges, and expenses before investing. This and other information is contained in the Funds’ prospectus and summary prospectus, which you may obtain by calling 1-800-742-7272. Read the prospectus and summary prospectus carefully before investing. Investing includes the risk of loss.
The William Blair Funds are distributed by William Blair & Company, L.L.C., member FINRA/SIPC.
The William Blair SICAV is a Luxembourg investment company with variable capital registered with the Commission de Surveillance du Secteur Financier (“CSSF”) which qualifies as an undertaking for collective investment in transferable securities (“UCITS”). The Management Company of the SICAV has appointed William Blair Investment Management, LLC as the investment manager for the fund.
Please carefully consider the investment objectives, risks, charges, and expenses of the William Blair SICAV. This and other important information is contained in the prospectus and Key Investor Information Document (KIID). Read these documents carefully before investing. The information contained on this website is not a substitute for those documents or for professional external advice.
William Blair Investment Management, LLC is an investment adviser registered with the U.S. Securities and Exchange Commission.
Issued in the United Kingdom by William Blair International, Ltd., authorized and regulated by the Financial Conduct Authority (FCA), and is only directed at and is only made available to persons falling within articles 19, 38, 47, and 49 of the Financial Services and Markets Act of 2000 (Financial Promotion) Order 2005 (all such persons being referred to as "relevant persons").
Issued in the European Economic Area (EEA) by William Blair B.V., authorized and supervised by the Dutch Authority for the Financial Markets (AFM) under license number 14006134 and also supervised by the Dutch Central Bank (DNB), registered at the Dutch Chamber of Commerce under number 82375682 and has its statutory seat in Amsterdam, the Netherlands. This material is only intended for eligible counterparties and professional clients.
Issued in Switzerland by William Blair Investment Services (Zurich) GmbH, Talstrasse 65, 8001 Zurich, Switzerland ("WBIS"). WBIS is engaged in the offering of collective investment schemes and renders further, non-regulated services in the financial sector. WBIS is affiliated with FINOS Finanzomubdsstelle Schweiz, a recognized ombudsman office where clients may initiate mediation proceedings pursuant to articles 74 et seq. of the Swiss Financial Services Act ("FinSA"). The client advisers of WBIS are registered with regservices.ch by BX Swiss AG, a client adviser registration body authorized by the Swiss Financial Market Supervisory Authority ("FINMA"). WBIS is not supervised by FINMA or any other supervisory authority or self-regulatory organization. This material is only intended for institutional and professional clients pursuant to article 4(3) to (5) FinSA.
Issued in Australia by William Blair Investment Management, LLC (“William Blair”), which is exempt from the requirement to hold an Australian financial services license under Australia's Corporations Act 2001 (Cth). William Blair is registered as an investment advisor with the U.S. Securities and Exchange Commission (“SEC”) and regulated by the SEC under the U.S. Investment Advisers Act of 1940, which differs from Australian laws. This material is intended only for wholesale clients.
Issued in Singapore by William Blair International (Singapore) Pte. Ltd. (Registration Number 201943312R), which is regulated by the Monetary Authority of Singapore under a Capital Markets Services License to conduct fund management activities. This material is intended only for institutional investors and may not be distributed to retail investors.
Issued in Canada by William Blair Investment Management, LLC, which relies on the international adviser exemption, pursuant to section 8.26 of National Instrument 31-103 in Canada.