BLAIR WILLIAM & CO IL
Q3 2023 Form 13-F
CHICAGO, ILLINOIS
CIK 0000902367
· CRD 1252
· SEC-registered investment adviser
$26.1B Reported Value Total
WILLIAM BLAIR & COMPANY L.L.C. reports 44,686 total accounts under management (AUM). There are 39,449 discretionary accounts valued at $38,077,970,466, and 5,237 non-discretionary accounts valued at $3,643,630,364.
Source: Form ADV filed * Note that certain holdings are exempt from Form 13-F reporting, so the AUM totals may be greater than the Form 13-F total.
Private funds (Form ADV)
59 funds
· $2.3B gross asset value
Hedge Fund: $1.4B · Private Equity Fund: $487.1M · Other: $115.1M
Source: Form ADV filed 2026-10-16
Reported value
$26.1B
Quarter over quarter
-5.0%
Holdings
1,772
Top-10 concentration
23.7%
Filing Structure
Reports holdings for
- Performa Ltd US LLC · File #028-17620 · Q2 2021 – Q2 2021 · declared by one filing
Key People
Form ADV owners & control persons
Cissie Citardi
EXECUTIVE COMMITTEE, GENERAL COUNSEL
Ryan Jacob Devore
EXECUTIVE COMMITTEE
Brent Walker Gledhill
PRESIDENT, CEO
Filing Navigation
Coverage begins with the second quarter of 2013. Earlier quarters are not shown while their accuracy is being verified.
13F Metrics
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Q3 2023 13F record
Q3 2023 13F filing summary
| Period of report | September 30, 2023 |
|---|---|
| Filed | November 09, 2023 |
| Form | 13F-HR |
| Reported value | $26.1B |
| Positions | 1,772 |
| Change in reported value | -4.5% |
| New positions | 72 |
| Exited positions | 90 |
| Position turnover | 8.7% |
| Top-10 concentration | 23.7% |
13F filings by quarter
| Quarter | Positions | Value |
|---|---|---|
|
Q2 2026 13F
Filed Aug 11, 2026
|
1,977 | $38.4B |
|
Q1 2026 13F
Filed May 8, 2026
|
1,899 | $34.9B |
|
Q4 2025 13F
Filed Feb 17, 2026
|
1,864 | $37.3B |
|
Q3 2025 13F
Filed Nov 12, 2025
|
1,840 | $37.6B |
|
Q2 2025 13F
Filed Jul 24, 2025
|
1,817 | $36.0B |
|
Q1 2025 13F
Filed May 9, 2025
|
1,793 | $33.2B |
|
Q4 2024 13F
Filed Feb 12, 2025
|
1,805 | $34.4B |
|
Q3 2024 13F
Filed Nov 12, 2024
|
1,809 | $34.1B |
|
Q2 2024 13F
Filed Aug 12, 2024
|
1,794 | $32.4B |
|
Q1 2024 13F
Filed May 9, 2024
|
1,776 | $31.8B |
|
Q4 2023 13F
Filed Feb 12, 2024
|
1,768 | $29.3B |
|
Q3 2023 13F
Filed Nov 9, 2023
|
1,772 | $26.1B |
|
Q2 2023 13F
Filed Aug 11, 2023
|
1,791 | $27.3B |
|
Q1 2023 13F
Filed May 12, 2023
|
1,781 | $25.0B |
|
Q4 2022 13F
Filed Feb 10, 2023
|
1,790 | $23.0B |
|
Q3 2022 13F
Filed Nov 9, 2022
|
1,781 | $21.8B |
|
Q2 2022 13F
Filed Aug 10, 2022
|
1,821 | $22.5B |
|
Q1 2022 13F
Filed May 13, 2022
|
1,872 | $28.5B |
|
Q4 2021 13F
Filed Feb 14, 2022
|
1,926 | $31.9B |
|
Q3 2021 13F
Filed Nov 12, 2021
|
1,834 | $29.4B |
33 earlier quarters on file — choose one from the quarter menu above.
Top 20 holdings · Q3 2023
| # | Holding | Reported value | % of portfolio |
|---|---|---|---|
| 1 | MSFT MICROSOFT CORP | $1.2B | 4.41% |
| 2 | AAPL APPLE INC | $1.1B | 4.1% |
| 3 | AMZN AMAZON COM INC | $732.7M | 2.81% |
| 4 | IDXX IDEXX LABS INC | $524.7M | 2.01% |
| 5 | V VISA INC | $507.2M | 1.94% |
| 6 | MA MASTERCARD INCORPORATED | $475.9M | 1.83% |
| 7 | GOOG ALPHABET INC | $460.9M | 1.77% |
| 8 | ZTS ZOETIS INC | $422.5M | 1.62% |
| 9 | DXCM DEXCOM INC | $420.5M | 1.61% |
| 10 | DHR DANAHER CORPORATION | $418.2M | 1.6% |
| 11 | ADBE ADOBE INC | $347.9M | 1.33% |
| 12 | WDAY WORKDAY INC | $339.2M | 1.3% |
| 13 | GOOGL ALPHABET INC | $325.5M | 1.25% |
| 14 | CSGP COSTAR GROUP INC | $322.2M | 1.24% |
| 15 | COST COSTCO WHSL CORP NEW | $318.0M | 1.22% |
| 16 | JPM JPMORGAN CHASE & CO | $315.2M | 1.21% |
| 17 | SPY SPDR S&P 500 ETF TR | $301.3M | 1.16% |
| 18 | VEEV VEEVA SYS INC | $298.3M | 1.14% |
| 19 | WSO WATSCO INC | $291.0M | 1.12% |
| 20 | POOL POOL CORP | $276.9M | 1.06% |
Values as reported on the Q3 2023 Form 13F. Every position is in the holdings table below.