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Mike Custar

Mike Custar

Managing Director, Co-Head of Private Capital Advisory

New York skyline

About Mike

Mike Custar is a managing director and co-head of Private Capital Advisory for William Blair based in the firm’s New York office. He joined William Blair's investment banking team in 2022. Prior to William Blair, he worked for M2O Private Fund Advisors, Credit Suisse, and PricewaterhouseCoopers.

Community Involvement

Abilis – Board Director
Athletic Advisory Council for Greenwich Country Day School

Notable Transactions

  • $2,100,000,000

    Multi-Asset Continuation Fund for Five Assets Held Across Multiple Funds

    September 2024

  • Not Disclosed

    Single-Asset Continuation Fund

    June 2024

  • Not Disclosed

    Single-Asset Continuation Fund for StoneRidge Insurance Brokers, Inc.

    May 2023

  • Not Disclosed

    LP Stake Sale with a Stapled
    Fund Commitment

    December 2023

  • Not Disclosed

    Single-Asset Continuation
    Fund for

    December 2023

  • Not Disclosed

    Single-Asset Continuation Fund for

    August 2023

  • Not Disclosed

    has made a minority equity
    investment in existing
    portfolio company

    March 2023

  • Rigorous pursuit of your success. Every transaction. Every time.

    Our 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
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    Private Capital Advisory

    William Blair has extensive experience providing private equity firms with leading advice and execution across M&A, capital raising, and other strategic transactions. Our team of experts provides financial sponsors and their investors with holistic, bespoke solutions across all stages of the private equity lifecycle. Our Private Capital Advisory team works closely with our industry bankers, M&A Advisory group, and capital markets professionals to provide thoughtful insights and creative solutions designed to optimize client outcomes.

    More about private capital advisory at William Blair
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    Financial Sponsors

    William Blair's Financial Sponsors Group is focused on developing and institutionalizing relationships with leading private equity firms around the world. Many of these relationships have been developed for over two decades providing us with senior-level access and credibility with the key decision-makers at each private equity firm. With over 295 successful sales to financial sponsors since 2015, we have proprietary insights into each financial sponsor's unique investment criteria, approach, and behavior. Our team's highly-relevant experience with and relevance to the private equity community uniquely positions William Blair to deliver exceptional results for our M&A sell-side clients.

    More about our financial sponsors expertise
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    About William Blair

    William Blair is a premier global boutique 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.*

    • 1935

      Year William Blair was founded

    • 1,900+

      Employees worldwide

    • 149 billion+

      Client assets

    • 89 Years

      Independent and employee-owned

    • 20+

      Offices worldwide

    • ~650

      Companies under coverage

    As of September 30, 2024
    *Includes strategic partnerships with Allier Capital, BDA Partners, and Poalim Capital Markets.

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    This content is for informational and educational purposes only and not intended as investment advice or a recommendation to buy or sell any security. Investment advice and recommendations can be provided only after careful consideration of an investor's objectives, guidelines, and restrictions.

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