WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
All 13F Filings
- Location
- Chicago, IL
- Most recent 13F
- Q4 2025
- Holdings value ($000)
- 35,851,584
- Description
- Chicago Illinois based active public markets manager with a manager led operating structure and a research first and risk aware investment mandate. The approach emphasizes valuation discipline and downside awareness, fundamental research depth, and multi sleeve portfolio balancing for public markets focused allocations. Portfolio governance emphasizes clear accountability, measured exposure, and resilient implementation through investment committee cadence and mandate calibration.
- Website
- https://www.williamblair.com/
- Founded
- 1935
- Chairman
- —
- CEO
- —
- All SEC filings
- View on sec.gov
Sector allocation over time (stocks only)
Stacked by quarter. Hover to see detailed sector breakdown for any quarter.
| Quarter | Date Filed | Holdings | Value ($000) | Form Type | Name |
|---|---|---|---|---|---|
| Q4 2025 | 2/9/2026 | 413 | 35,851,584 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q3 2025 | 11/12/2025 | 414 | 38,674,037 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q2 2025 | 7/29/2025 | 417 | 37,679,983 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q1 2025 | 5/9/2025 | 423 | 35,621,637 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q4 2024 | 2/10/2025 | 433 | 40,939,662 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q3 2024 | 11/8/2024 | 412 | 40,534,351 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q2 2024 | 8/8/2024 | 411 | 38,120,368 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q1 2024 | 5/8/2024 | 410 | 38,687,455 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q4 2023 | 2/9/2024 | 406 | 34,363,339 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q3 2023 | 11/9/2023 | 398 | 30,093,063 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q2 2023 | 8/11/2023 | 395 | 31,184,946 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q1 2023 | 5/12/2023 | 393 | 28,699,364 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q4 2022 | 2/9/2023 | 401 | 26,141,511 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q3 2022 | 11/9/2022 | 387 | 25,300,876 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q2 2022 | 8/10/2022 | 403 | 26,983,859 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q1 2022 | 5/11/2022 | 441 | 33,470,556 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q4 2021 | 2/14/2022 | 427 | 37,009,993 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q3 2021 | 11/10/2021 | 431 | 35,457,365 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q2 2021 | 8/12/2021 | 465 | 31,867,471 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q1 2021 | 5/13/2021 | 367 | 30,878,987 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q4 2020 | 2/9/2021 | 356 | 30,036,160 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q3 2020 | 11/6/2020 | 343 | 25,666,025 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q2 2020 | 8/12/2020 | 341 | 24,566,283 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q1 2020 | 5/8/2020 | 339 | 20,547,647 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
| Q4 2019 | 2/12/2020 | 356 | 25,094,282 | 13F-HR | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
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Money flow by instrument (QoQ, ex-options)
| Type | Value ($000) | Share % | Inflow | Outflow | Net |
|---|---|---|---|---|---|
| Stocks | 35.79 M | 99.8% | 0 | 2.788 M | -2.788 M |
| ETFs | 58.1 K | 0.2% | 0 | 34.64 K | -34.64 K |
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Fund Snapshot
Q4 2025
Latest filed
2/9/2026
Total value ($000)
35,851,584
Holdings
413
QoQ value change ($000)
-2,822,453
(-7.3%)
Value = total reported 13F value ($000), Holdings = number of positions.
13F Value over time
Holdings count over time
Sector allocation (latest, stocks only)
Methodology:
sector allocation is stocks-only;
instrument flow table is ex-options;
options exposure is shown separately.
Details.