Asset manager · Chicago, IL
William Blair Investment Management, LLC
SEC-registered investment adviser · CRD 173961 · SEC 801-80640
At a glance
William Blair Investment Management, LLC is an SEC-registered investment adviser based in Chicago, Illinois, with $65.6 billion in regulatory assets under management as of its Form ADV filed April 9, 2026. Its largest client group by assets is pooled investment vehicles, and it reports 2 individual clients. By Form ADV it is a asset manager, ranked 180th of 3,218 asset managers and 366th of 17,210 SEC-registered advisers by assets.
Main office 312-236-1600williamblair.comLinkedInAs filed on Form ADV
- Regulatory AUM
- $66B
- Rank among asset managers
- #180 of 3,218
- Rank among all SEC RIAs
- #366 of 17,210
- Rank in Illinois
- #26 of 684
- Individual clients
- 2
- High-net-worth clients
- 2
- Accounts
- 682
- Discretionary
- 100% of AUM
- Employees
- 388
- Advisory staff
- 142
- Offices
- 4
Owners and executives on its Form ADV
- Brent Walker GledhillPresident, Chief Executive Officer, Executive Committee Member
- Ryan Jacob DevoreExecutive Committee Member
- Lisa D. AndersonDirector of Operations
- Cissie CitardiGeneral Counsel, Executive Committee Member
- Matthew Montgomery ZimmerExecutive Committee Member
- Beth A SatterfieldChief Operating Officer, Executive Committee Member
- Michael William TrimbergerChief Financial Officer, Executive Committee Member
- Scott Thomas McLaughlinExecutive Committee Member
- Steven Robert ToleExecutive Committee Member
- Robert Daniel KendallGlobal Head of Investment Management, Executive Committee Member
- Telmo R MartinsChief Compliance Officer
Custody and brokerage
Broker-dealer
Hybrid RIA
William Blair Investment Management, LLC is a hybrid RIA: 119 of its employees are also registered representatives of a broker-dealer. It names an affiliated broker-dealer: William Blair & Company L.L.C..
- William Blair & Company L.L.C. ↗CRD 1252
Who it serves
| Client type | Clients | Regulatory AUM | Share |
|---|---|---|---|
| Pooled investment vehicles | 51 | $22B | 34% |
| Investment companies | 29 | $16B | 24% |
| State or municipal government entities | 54 | $12B | 18% |
| Pension and profit sharing plans | 73 | $12B | 18% |
| Charitable organizations | 68 | $2.3B | 4% |
| Sovereign wealth funds and foreign official institutions | 4 | $721M | 1% |
| Other investment advisers | 1 | $321M | <1% |
| Corporations or other businesses | 10 | $210M | <1% |
| Other | 386 | $193M | <1% |
| Insurance companies | 4 | $24M | <1% |
| High-net-worth individuals | 2 | $18M | <1% |
Private funds
William Blair Investment Management, LLC reports 9 private funds with $464M in gross assets: other private funds (Form ADV Item 7.B).
Disciplinary disclosures
William Blair Investment Management, LLC answers yes to 3 disclosure items in Item 11 of Form ADV (criminal, regulatory or civil matters involving the firm or its advisory affiliates). Read the details on the SEC’s adviser search ↗
Services
- Portfolio management for individuals and small businesses
- Portfolio management for investment companies
- Portfolio management for pooled investment vehicles
- Portfolio management for businesses and institutions
How it’s paid
- A percentage of assets under management
- Performance-based fees
Form ADV and brochures on the SEC’s adviser search ↗williamblair.com ↗
AtlasMembers
The full record on William Blair Investment Management, LLC
Ten years of SEC filings, its owners and contacts, and how it stacks up against its peers. Atlas members see all of it.
- Assets, accounts, clients and staff, ten years of filings
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- Growth over one, three and five years
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- Rank against 280 peers of its type and size
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- Owners and executives, with titles and stakes
- 11 namedLocked
- Main office, fax and compliance officer
- Locked
- Filing changes this year, with alerts
- 2Locked
Free while Atlas launches: create a free account and confirm your email. Every figure comes from SEC filings.
Background
Questions
How much does William Blair Investment Management, LLC manage?
William Blair Investment Management, LLC reports $65.6 billion in regulatory assets under management across 682 accounts, 100% of it on a discretionary basis, on its Form ADV filed April 9, 2026.
What kind of firm is William Blair Investment Management, LLC?
William Blair Investment Management, LLC is a asset manager by its Form ADV answers. Most of its assets are managed for funds, institutions or other businesses rather than individuals.
Who are William Blair Investment Management, LLC’s clients?
By assets, its largest client types are pooled investment vehicles ($22.1 billion, 51 clients); investment companies ($15.8 billion, 29 clients); state or municipal government entities ($11.9 billion, 54 clients).
Does William Blair Investment Management, LLC manage private funds?
Yes. It reports 9 private funds with $464 million in gross assets, including other private funds.
Does William Blair Investment Management, LLC have any disciplinary history?
William Blair Investment Management, LLC answers yes to 3 disclosure items in Item 11 of Form ADV, which covers criminal, regulatory and civil matters involving the firm or its advisory affiliates. The details are on the SEC’s adviser search.
Where these numbers come from
Every figure is William Blair Investment Management, LLC’s own answer on its latest Form ADV, from the SEC’s registered-adviser list as of October 1, 2026: regulatory assets and accounts (Item 5.F), clients by type (5.D), employees (5.A and 5.B), compensation (5.E) and services (5.G). Custodians come from Schedule D 5.K(3) of its latest filing (2026-04-09), which lists those holding 10% or more of separately managed account assets and the amount at each. “Hybrid” means some employees are also registered representatives of a broker-dealer (Item 5.B(2)); affiliated broker-dealers are the related persons it lists in Item 7.A and Schedule D. Firm type comes from its own answers: broker-dealer firms are registered broker-dealers themselves (Item 6.A); private fund advisers manage mostly private funds (Item 7.B, 5.D); wealth managers manage at least half their assets for individuals (5.D). Ranks compare it by regulatory assets with every SEC-registered adviser and with firms of its type. Figures are as of the firm’s last annual update, so they can lag recent deals and market moves. Regulatory AUM counts assets the firm continuously supervises and can differ from what a firm markets.
Not an endorsement or a recommendation. Before hiring any adviser, read its Form ADV Part 2A brochure and check its record on the SEC’s adviser search. How to check a financial advisor →