Managing Director, Head of M&A
Andrew Jessen is a managing director and head of M&A for William Blair based in the firm’s Chicago office. He joined William Blair's investment banking team in 2004. Prior to William Blair, he worked for Lehman Brothers, Accenture, and A.T. Kearney.
has been acquired by
August 2025
William Blair acted as the lead financial advisor to Pave America, Shoreline Equity Partners, and Trivest Partners, in connection with the Company’s sale to AEA Investors and British Columbia Investment Management Corporation.
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a portfolio company of
Morgan Stanley Capital Partners
has been acquired by
December 2024
a portfolio company of Bain Capital
has been acquired by
August 2024
a portfolio company of Harvest Partners
has received a growth
investment from
August 2024
William Blair acted as financial advisor to Service Express, a portfolio company of Harvest Partners, in connection with its growth investment from Warburg Pincus.
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has received a growth equity investment from
February 2023
William Blair & Company acted as the exclusive financial advisor to Spotless Brands in connection with its $600 million capital raise, consisting of non-convertible redeemable preferred units, common equity, and first-lien credit.
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a portfolio company of Kohlberg & Co.
has been acquired by
June 2023
William Blair acted as the lead financial advisor to U.S. Retirement and Benefits Partners, a portfolio company of Kohlberg & Company, in connection with its sale to the Vistria Group.
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a portfolio company of Linden Capital Partners
has received an investment from
December 2021
a portfolio company of Ares Management
has received a partnership investment from
December 2021
William Blair acted as lead financial advisor to Convergint Technologies, a portfolio company of Ares Management Corporation (NYSE: ARES), in connection with its equity sale from a fund managed by Ares’ Private Equity Group and other existing shareholders to Leonard Green & Partners, L.P. and funds managed by Harvest Partners, LP.
Read moreOur investment bankers are 100 percent committed to your organization’s sustained success. By drawing on our deep industry and product experience as well as our dedicated global resources, we provide advisory and financing services that allow you to capitalize on today’s opportunities and anticipate tomorrow’s challenges.
More about investment banking at William Blair
Publicly traded and privately held companies around the globe count on our M&A Advisory Group for comprehensive financial advisory services and expert guidance. We serve buyers and sellers by providing in-depth financial and strategic analysis, identifying optimal potential transaction partners, developing creative deal structures, and negotiating complex transaction terms.
Our long record, leadership position in the middle market, and high level of transaction activity enable us to clear the market globally in search of the best transaction partners. Our bankers are true experts in your industry and understand the competitive landscape and deal environment facing our clients.
More about our M&A expertise
William Blair is a premier global partnership with expertise in investment banking, investment management, and private wealth management. We provide advisory services, strategies, and solutions to meet our clients’ evolving needs. As an independent and employee-owned firm, together with our strategic partners, we operate in more than 20 offices worldwide.*
Year William Blair was founded
Employees worldwide
Client assets
Independent and employee-owned
Offices worldwide
Companies under coverage
As of June 30, 2025
*Includes strategic partnerships with Allier Capital, BDA Partners, and Poalim Capital Markets.
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