The Perpetual Growth Machine
The Perpetual Growth Machine—our framework for viewing how human ingenuity converts challenges into progress—reveals how humanity’s relentless drive to improve sparks innovation, powers economic growth, and provides investors with a framework to uncover the next wave of opportunities.
Investments
Active management across a wide range of funds, including global equity, U.S. growth and core equity, U.S. value equity, and emerging markets debt.
Search for a Fund
Investments
Active management across a wide range of funds, including global equity, U.S. growth and core equity, U.S. value equity, and emerging markets debt.
Search for a Fund
Investments
Active management across a wide range of funds, including global equity, U.S. growth and core equity, U.S. value equity, and emerging markets debt.
Investments
Active management across a wide range of funds, including global equity, U.S. growth and core equity, U.S. value equity, and emerging markets debt.
Featured Funds
WBSIX
View Fund:
https://im.williamblair.com/investments/mutual-funds/wbsix-small-cap-growth-fund
LCGFX
View Fund:
https://im.williamblair.com/investments/mutual-funds/lcgfx-large-cap-growth-fund
WILIX
View Fund:
https://im.williamblair.com/investments/mutual-funds/wilix-international-leaders-fund
WBEIX
View Fund:
https://im.williamblair.com/investments/mutual-funds/wbeix-emerging-markets-growth-fund
BESIX
View Fund:
https://im.williamblair.com/investments/mutual-funds/besix-emerging-markets-small-cap-growth-fund
WEDIX
View Fund:
https://im.williamblair.com/investments/mutual-funds/wedix-emerging-markets-debt-fund
Featured Funds
LU2093691256
View Fund:
https://im.williamblair.com/investments/sicav-funds/lu2093691256-emerging-markets-debt-hard-currency-fund
LU2879845290
View Fund:
https://im.williamblair.com/investments/sicav-funds/lu2879845290-emerging-markets-frontier-debt-fund
LU0995405320
View Fund:
https://im.williamblair.com/investments/sicav-funds/lu0995405320-emerging-markets-growth-fund
LU1397782274
View Fund:
https://im.williamblair.com/investments/sicav-funds/lu1397782274-emerging-markets-small-cap-growth-fund
LU0995404943
View Fund:
https://im.williamblair.com/investments/sicav-funds/lu0995404943-us-small-mid-cap-growth-fund
LU2511384518
View Fund:
https://im.williamblair.com/investments/sicav-funds/lu2511384518-us-large-cap-growth-fund
Resources for Financial Professionals
The Rising Opportunity in U.S. Small Caps
Non-U.S. Investing in a Fragmenting World
Alaina Anderson, CFA, shares why shifting market dynamics may signal a turning point for non-U.S. equities—making now a compelling time to invest globally.
Demystifying Emerging Markets Debt
Resources for Financial Professionals
Emerging Markets Debt Summit Research Platform
To better understand global trends and the countries we invest in, our emerging markets debt team leverages Summit, a proprietary research platform.
Why Consider Frontier Markets Debt?
Investments
Active management across a wide range of funds, including global equity, U.S. growth and core equity, U.S. value equity, and emerging markets debt.
Search for a Strategy
Investments
Active management across a wide range of funds, including global equity, U.S. growth and core equity, U.S. value equity, and emerging markets debt.
Search for a Strategy
Investments
Active management across a wide range of funds, including global equity, U.S. growth and core equity, U.S. value equity, and emerging markets debt.
Search for a Strategy
Featured Strategies
View Strategy:
https://im.williamblair.com/investments/separate-accounts/large-cap-growth
View Strategy:
https://im.williamblair.com/investments/separate-accounts/small-mid-cap-growth
View Strategy:
https://im.williamblair.com/investments/separate-accounts/emerging-markets-growth
View Strategy:
https://im.williamblair.com/investments/separate-accounts/emerging-markets-ex-china-growth
View Strategy:
https://im.williamblair.com/investments/separate-accounts/emerging-markets-debt-hard-currency
View Strategy:
https://im.williamblair.com/investments/separate-accounts/emerging-markets-debt
Resources for Institutional Investors
5 Forces Fueling the Energy Transition
Who We Are
As a trusted partner, we serve consultants, foundations and endowments, public funds, corporations, Taft-Hartley plans, financial institutions, and financial advisors.
Resources for Institutional Investors
Emerging Markets Debt Summit Research Platform
To better understand global trends and the countries we invest in, our emerging markets debt team leverages Summit, a proprietary research platform.
Emerging Markets Debt: 3 Ways We Are Differentiated
Our emerging markets debt team leverages a distinct approach, dynamic mindset, and diverse expertise to pursue stronger portfolio outcomes for clients.
Sustainable Investing
As an active manager whose heritage is built on rigorous, fundamental analysis, environmental, social, and governance considerations have long informed our investment decisions.
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
In the News
View all media mentionsInnovation, Investors, and EVs: Vivian Lin Thurston on CNBC
Vivian Lin Thurston, CFA, partner, portfolio manager, joined CNBC to break down what’s driving China’s markets in 2025—highlighting rapid innovation in AI and tech, the importance of fundamentals for institutional investors, and the evolving Chinese EV sector.
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