Data / Investment advisers / Illinois / William Blair Investment Management, LLC
William Blair Investment Management, LLC, Chicago, IL: $65.6 billion AUM, SEC registered investment adviser
Updated November 7, 2026. Source: the SEC's Form ADV data files for investment advisers.
William Blair Investment Management, LLC is an SEC registered investment adviser with its main office in Chicago, Illinois and reports $65.6 billion in regulatory assets under management in its Form ADV filed April 9, 2026. Its clients include pooled investment vehicles, investment companies and state and municipal governments. It is paid through a percentage of assets under management and performance based fees. It advises 9 private funds.
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- Registration
- SEC registered investment adviser
- CRD number
- 173961
- SEC file number
- 801-80640
- SEC status
- Approved, effective December 4, 2014
- Main office
- 150 North Riverside Plaza, Chicago, IL 60606
- Phone
- (312) 236-1600
- Regulatory AUM
- $65,596,131,787 in the Form ADV filed April 9, 2026
- Discretionary AUM
- $65,596,131,787
- Accounts
- 682
- Employees
- 388, of which 142 give investment advice
- Form of organization
- Limited Liability Company
- Paid through
- a percentage of assets under management, performance based fees
- Private funds
- 9: 9 other private funds
- Gross assets of private funds
- $464,372,728
- Other offices
- 3
- Form ADV Item 11 disclosures
- Reported: SEC or CFTC regulatory actions
- Latest Form ADV filing
- April 9, 2026
- SEC record
- Investment Adviser Public Disclosure
Clients
Client types the adviser reports in Form ADV item 5.D, with the AUM it attributes to each.
| Client type | Clients | AUM |
|---|---|---|
| Pooled investment vehicles | 51 | $22.15 billion |
| Investment companies | 29 | $15.84 billion |
| State or municipal government entities | 54 | $11.93 billion |
| Pension and profit sharing plans | 73 | $11.85 billion |
| Charitable organizations | 68 | $2.34 billion |
| Sovereign wealth funds and foreign official institutions | 4 | $721.5 million |
| Other investment advisers | 1 | $320.7 million |
| Corporations or other businesses | 10 | $209.5 million |
| Insurance companies | 4 | $23.5 million |
| High net worth individuals | 2 | $18.3 million |
AUM in the SEC's monthly files
Each change in the AUM the adviser reported across the monthly SEC files held here, with the first file that shows the new value.
| First in the file of | AUM | Form ADV filed |
|---|---|---|
| April 1, 2026 | $65.60 billion | March 31, 2026 |
| December 1, 2025 | $71.59 billion | August 7, 2025 |
Other advisers in Chicago
| Adviser | City | AUM | Private funds | Source |
|---|---|---|---|---|
| Cresset Asset Management, LLC | Chicago | $78.94 billion | 145 | adviserinfo.sec.gov |
| Blue Owl Real Estate Capital LLC | Chicago | $67.88 billion | 54 | adviserinfo.sec.gov |
| CIBC Private Wealth Advisors, Inc. | Chicago | $67.84 billion | Not listed | adviserinfo.sec.gov |
| Harbor Capital Advisors, Inc. | Chicago | $67.64 billion | 1 | adviserinfo.sec.gov |
| Adams Street Partners, LLC | Chicago | $66.49 billion | 327 | adviserinfo.sec.gov |
| William Blair & Company L.L.C. | Chicago | $64.28 billion | 21 | adviserinfo.sec.gov |
| Towers Watson Investment Services, Inc. | Chicago | $62.67 billion | 11 | adviserinfo.sec.gov |
| Valor Equity Partners | Chicago | $59.32 billion | 54 | adviserinfo.sec.gov |
Also on SpecStream
- Investment advisers in Chicago, IL
- Investment advisers in Illinois
- Advisers with $10 billion to $100 billion in AUM
- Advisers serving pooled investment vehicles
- Advisers serving investment companies
- Advisers that manage private funds
- William Blair Investment Management, LLC on the SEC's adviser search
Public data published by the US Securities and Exchange Commission (US government work). Advisers report these values themselves in Form ADV, and neither the SEC nor the states approve or guarantee them. AUM is regulatory assets under management as the adviser reported it in Form ADV item 5.F, which can differ from the AUM a firm quotes elsewhere. Exempt reporting advisers do not report AUM. Office address, phone and website are the adviser's main office as filed; a firm that files its main office as a private residence shows no street address or phone. An Item 11 disclosure is a reported event, not a finding about the firm today. Details for each firm are on the SEC's Investment Adviser Public Disclosure site. This page uses SEC data and is not endorsed or certified by the SEC. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.