William Blair & Company L.L.C.
Chicago, IL·SEC-registered · CRD #1252
William Blair & Company L.L.C. is an SEC-registered investment advisory firm in Chicago, IL managing $64B across 41k client accounts, with 231 advisory staff.
Regulatory snapshot
Verify on SEC.govRegulatory AUM
$64B
Client accounts
41k
Advisory staff
231
Fee model
Fee-based
How William Blair & Company L.L.C. is paid
Compensation arrangements disclosed on Form ADV. A fee-based firm may earn both client fees and product commissions; ask which applies to you.
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Common questions about William Blair & Company L.L.C.
How much does William Blair & Company L.L.C. manage?
Per its most recent SEC Form ADV filing (03/31/2026), William Blair & Company L.L.C. reports $64B in regulatory assets under management across roughly 41k client accounts.
How does William Blair & Company L.L.C. charge?
William Blair & Company L.L.C. is a fee-based firm. Its disclosed compensation arrangements are: % of assets, Commissions. Exact fee schedules appear in the firm's Form ADV Part 2 brochure — confirm current fees directly with the firm.
Is William Blair & Company L.L.C. a fiduciary?
Yes. William Blair & Company L.L.C. is registered with the U.S. Securities and Exchange Commission (CRD #1252), and SEC-registered investment advisers owe a fiduciary duty to act in their clients' best interest. You can verify its registration and any disclosures on the SEC's public record.
Is William Blair & Company L.L.C. taking new clients like me?
Availability and account minimums vary and aren't in the public filing. The fastest way to find out is the free 2-minute match — it checks William Blair & Company L.L.C. and comparable advisors against your goals and assets, and only surfaces firms open to your situation.
Other advisory firms in Chicago, IL
Profile compiled from William Blair & Company L.L.C.'s public SEC Form ADV filing (CRD #1252, filed 03/31/2026). AdvisoryReviews is an independent comparison and matching service and is not affiliated with, endorsed by, or a partner of William Blair & Company L.L.C.. Listing does not imply any relationship. Figures are as reported to the SEC and may have changed; verify current details at adviserinfo.sec.gov. Are you with William Blair & Company L.L.C.? Claim this profile.