Wealth Manager
    SEC Registered

    William Blair Investment Management, LLC

    Registered investment advisor · Chicago, Illinois · CRD #173961

    Assets Under Management
    $65.6B
    Client Accounts
    682
    Employees
    388
    CRD Number
    173961
    Registration
    SEC Registered
    Custodian
    The Northern Trust Company, State Street Bank And Trust Company, Bank Of New York Mellon

    Source: SEC Form ADV filings. Data as of 2026-07-06.

    About William Blair Investment Management, LLC

    William Blair & Company, L.L.C., founded in 1935 in Chicago, is an independent, employee-owned global investment banking and asset management firm. The company operates from its headquarters at The William Blair Building and has a strong presence with offices across the U.S. and internationally. William Blair offers a wide range of financial services, focusing on wealth management, investment banking, and institutional asset management. Its wealth management services cater to high-net-worth in

    Fee Structure

    Percentage of assets under management Yes
    Fixed fees Not reported
    Hourly charges Yes
    Performance-based fees Yes

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    Frequently Asked Questions

    What is William Blair Investment Management, LLC's AUM?

    William Blair Investment Management, LLC reports approximately $65.6B in regulatory assets under management, based on its most recent SEC Form ADV filing.

    Where is William Blair Investment Management, LLC headquartered?

    William Blair Investment Management, LLC is headquartered in Chicago, Illinois.

    What is William Blair Investment Management, LLC's CRD number?

    William Blair Investment Management, LLC's CRD number is 173961. You can use it to look up the firm's full regulatory record on the SEC's Investment Adviser Public Disclosure site.

    How many accounts does William Blair Investment Management, LLC manage?

    William Blair Investment Management, LLC manages approximately 682 client accounts according to its latest SEC filing.

    Is William Blair Investment Management, LLC SEC registered?

    Yes, William Blair Investment Management, LLC is registered with the SEC as an investment adviser with an approved registration status.

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