SEC 13F Intelligence

Managers / Q3 2025 · view latest →

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

CIK 0001644956 · 150 NORTH RIVERSIDE PLAZA, CHICAGO, IL, 60606 · 312-236-1600

Reported Value
$38.7B
Q3 2025
Positions
414
Filings on Record
30
2019–present window
Filed
Nov 12, 2025
original filing

Summary

William Blair Investment Management, LLC reported $38.7B in U.S.-listed holdings across 414 positions for Q3 2025.

Its largest position, NVDA, represents 5.6% of the portfolio.

Compared with Q2 2025, the fund opened 46 new positions and exited 49.

Portfolio Metrics

Turnover
+13.4%
vs prior filed quarter
Top-10 Concentration
+31.0%
share of reported value
Largest Position
+5.6%
Nvidia Corporation
New / Exited
46 / 49
positions this quarter

Methodology: turnover is min(value bought, value sold) ÷ average reported value across the two quarters — value-based, so market moves inflate it slightly versus a share-based measure. Concentration and largest position are shares of the filing’s total reported value, options excluded. New/exited counts compare against the prior filed quarter. All figures derive solely from the fund’s 13F filings.

Reported Value by Quarter

13F Reported Value
Q4 ’18: $20.1BQ4 ’18Q1 ’19: $23.8BQ2 ’19: $23.8BQ3 ’19: $23.4BQ4 ’19: $25.1BQ4 ’19Q1 ’20: $20.5BQ2 ’20: $24.6BQ3 ’20: $25.7BQ4 ’20: $30.0BQ4 ’20Q1 ’21: $30.9BQ2 ’21: $31.9BQ3 ’21: $35.5BQ4 ’21: $37.0BQ4 ’21Q1 ’22: $33.5BQ2 ’22: $27.0BQ3 ’22: $25.3BQ4 ’22: $26.1BQ4 ’22Q1 ’23: $28.7BQ2 ’23: $31.2BQ3 ’23: $30.1BQ4 ’23: $34.4BQ4 ’23Q1 ’24: $38.7BQ2 ’24: $38.1BQ3 ’24: $40.5BQ4 ’24: $40.9BQ4 ’24Q1 ’25: $35.6BQ2 ’25: $37.7BQ3 ’25: $38.7BQ4 ’25: $35.9BQ4 ’25Q1 ’26: $30.3Bfilingsflow.com

Portfolio Composition

By security type
Common Stock: 83.2%Other: 8.2%ADR: 7.4%REIT: 1.0%ETP: 0.3%Other: 0.0%
  • Common Stock · 83.2% · $32.2B
  • Other · 8.2% · $3.2B
  • ADR · 7.4% · $2.9B
  • REIT · 1.0% · $400M
  • ETP · 0.3% · $98M
  • Other · 0.0% · $233,399

Quarter-over-Quarter Changes full breakdown →

vs Q2 2025 (amended baseline)

IssuerMoveShare ΔShares nowValue ΔValue now
BSYBENTLEY SYS INCNEW+2.93M2.93M+$151M$151M
SNOWSNOWFLAKE INCNEW+518.2K518.2K+$117M$117M
CAVACAVA GROUP INCNEW+1.89M1.89M+$114M$114M
NXTNEXTRACKER INCNEW+1.47M1.47M+$109M$109M
TERTERADYNE INCNEW+775.5K775.5K+$107M$107M
LSCCLATTICE SEMICONDUCTOR CORPNEW+1.39M1.39M+$102M$102M
TENCENT MUSIC ENTMT GROUPNEW+3.78M3.78M+$88M$88M
ISHARES TRNEW+169.1K169.1K+$79M$79M

Value changes conflate price moves with buying and selling — share changes are the real signal. Share counts are not split-adjusted.

Holdings — Q3 2025

50 positions
Export to Excel
#IssuerClass% PortfolioValue ↓Shares
1NVDANVIDIA CORPORATIONhistory →COM5.58%$2.2B11.57M
2MSFTMICROSOFT CORPhistory →COM5.14%$2.0B3.84M
3TSMTAIWAN SEMICONDUCTOR MFG LTDhistory →SPONSORED ADS4.64%$1.8B6.42M
4AAPLAPPLE INChistory →COM3.70%$1.4B5.62M
5AMZNAMAZON COM INChistory →COM2.51%$971M4.42M
6AVGOBROADCOM INChistory →COM2.40%$927M2.81M
7METAMETA PLATFORMS INChistory →CL A2.25%$871M1.19M
8MAMASTERCARD INCORPORATEDhistory →CL A1.63%$629M1.11M
9SESEA LTDhistory →SPONSORD ADS1.60%$619M3.46M
10GOOGLALPHABET INChistory →CAP STK CL A1.56%$604M2.49M
11CGCARLYLE GROUP INChistory →COM1.42%$549M8.75M
12MLB1MERCADOLIBRE INChistory →COM1.39%$537M229.8K
13DOCSDOXIMITY INChistory →CL A1.10%$426M5.83M
14TRUTRANSUNIONhistory →COM1.01%$392M4.68M
15PPURE STORAGE INChistory →CL A1.01%$391M4.67M
16CIENCIENA CORPhistory →COM NEW0.92%$356M2.44M
17NOWSERVICENOW INChistory →COM0.89%$344M374.0K
18INTUINTUIThistory →COM0.86%$333M487.2K
19ORLYOREILLY AUTOMOTIVE INChistory →COM0.81%$314M2.92M
20ORCLORACLE CORPhistory →COM0.81%$311M1.11M
21NU HLDGS LTDORD SHS CL A0.81%$311M19.45M
22COSTCOSTCO WHSL CORP NEWhistory →COM0.77%$299M322.7K
23IDXXIDEXX LABS INChistory →COM0.76%$293M459.0K
24TLNTALEN ENERGY CORPhistory →COM0.75%$289M679.7K
25AG8AGILENT TECHNOLOGIES INChistory →COM0.71%$275M2.14M
26UNHUNITEDHEALTH GROUP INChistory →COM0.69%$265M768.5K
27PRMBPRIMO BRANDS CORPORATIONhistory →CLASS A COM SHS0.68%$262M11.83M
28UBERUBER TECHNOLOGIES INChistory →COM0.67%$259M2.64M
29ONTOONTO INNOVATION INChistory →COM0.66%$256M1.98M
30LINDE PLCSHS0.66%$255M537.4K
31LRCXLAM RESEARCH CORPhistory →COM NEW0.64%$247M1.84M
32TYLTYLER TECHNOLOGIES INChistory →COM0.62%$240M459.1K
33NVENT ELECTRIC PLCSHS0.61%$237M2.40M
34BWXTBWX TECHNOLOGIES INChistory →COM0.60%$231M1.26M
35LYVLIVE NATION ENTERTAINMENT INhistory →COM0.59%$229M1.40M
36EVEREST GROUP LTDCOM0.59%$228M651.5K
37LRNSTRIDE INChistory →COM0.58%$225M1.51M
38IM8NINSMED INChistory →COM PAR $.010.58%$224M1.56M
39VEEVVEEVA SYS INChistory →CL A COM0.58%$223M748.6K
40CCOCAMECO CORPhistory →COM0.57%$221M2.64M
41CREDICORP LTDCOM0.56%$218M820.1K
42ITAU UNIBANCO HLDG S ASPON ADR REP PFD0.56%$216M29.47M
43RYROYAL BK CDAhistory →COM0.55%$211M1.43M
44CPRTCOPART INChistory →COM0.54%$209M4.65M
45WEAWESTERN ALLIANCE BANCORPhistory →COM0.54%$208M2.39M
46BCOBRINKS COhistory →COM0.53%$207M1.77M
47MNSTMONSTER BEVERAGE CORP NEWhistory →COM0.52%$202M3.00M
48MLIMUELLER INDS INChistory →COM0.52%$202M1.99M
49WAYWAYSTAR HLDG CORPhistory →COM0.52%$200M5.26M
50SPOTIFY TECHNOLOGY S ASHS0.51%$197M282.3K

Filing History

QuarterReported ValuePositionsFiledTypeLinks
Q1 2026$30.3B413May 8, 202613F-HRchanges · EDGAR ↗
Q4 2025$35.9B413Feb 9, 202613F-HRchanges · EDGAR ↗
Q3 2025$38.7B414Nov 12, 202513F-HRchanges · EDGAR ↗
Q2 2025$37.7B417Jul 29, 202513F-HRchanges · EDGAR ↗
Q1 2025$35.6B423May 9, 202513F-HRchanges · EDGAR ↗
Q4 2024$40.9B433Feb 10, 202513F-HRchanges · EDGAR ↗
Q3 2024$40.5B412Nov 8, 202413F-HRchanges · EDGAR ↗
Q2 2024$38.1B411Aug 8, 202413F-HRchanges · EDGAR ↗
Q1 2024$38.7B410May 8, 202413F-HRchanges · EDGAR ↗
Q4 2023$34.4B406Feb 9, 202413F-HRchanges · EDGAR ↗
Q3 2023$30.1B398Nov 9, 202313F-HRchanges · EDGAR ↗
Q2 2023$31.2B395Aug 11, 202313F-HRchanges · EDGAR ↗
Q1 2023$28.7B393May 12, 202313F-HRchanges · EDGAR ↗
Q4 2022$26.1B401Feb 9, 202313F-HRchanges · EDGAR ↗
Q3 2022$25.3B387Nov 9, 202213F-HRchanges · EDGAR ↗
Q2 2022$27.0B403Aug 10, 202213F-HRchanges · EDGAR ↗
Q1 2022$33.5B441May 11, 202213F-HRchanges · EDGAR ↗
Q4 2021$37.0B427Feb 14, 202213F-HRchanges · EDGAR ↗
Q3 2021$35.5B431Nov 10, 202113F-HRchanges · EDGAR ↗
Q2 2021$31.9B465Aug 12, 202113F-HRchanges · EDGAR ↗
Q1 2021$30.9B367May 13, 202113F-HRchanges · EDGAR ↗
Q4 2020$30.0B356Feb 9, 202113F-HRchanges · EDGAR ↗
Q3 2020$25.7B343Nov 6, 202013F-HRchanges · EDGAR ↗
Q2 2020$24.6B341Aug 12, 202013F-HRchanges · EDGAR ↗
Q1 2020$20.5B339May 8, 202013F-HRchanges · EDGAR ↗
Q4 2019$25.1B356Feb 12, 202013F-HRchanges · EDGAR ↗
Q3 2019$23.4B357Nov 12, 201913F-HRchanges · EDGAR ↗
Q2 2019$23.8B372Aug 9, 201913F-HRchanges · EDGAR ↗
Q1 2019$23.8B406May 10, 201913F-HRchanges · EDGAR ↗
Q4 2018$20.1B404Feb 13, 201913F-HRchanges · EDGAR ↗

13F filings are due up to 45 days after quarter end, so holdings shown here lag the fund’s current book. Source: original SEC filing on EDGAR ↗.