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William Blair & Company

William Blair & Company Portfolio holdings

AUM $38.4B
1-Year Est. Return 25.71%
This Fund
S&P 500
This Quarter Est. Return
+7.16%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
AUM
$37.6B
AUM Growth
+$1.57B
Cap. Flow
-$160M
Cap. Flow %
-0.43%
Top 10 Hldgs %
26.02%
Holding
1,919
New
98
Increased
697
Reduced
774
Closed
75

Top Buys

Rank Stock Value
1
META icon
Meta Platforms (Facebook)
META
+$76.1M
2
APP icon
Applovin
APP
+$75.3M
3
NOW icon
ServiceNow
NOW
+$66.6M
4
CWAN
Clearwater Analytics
CWAN
+$65.8M
5
FANG icon
Diamondback Energy
FANG
+$30.7M

Top Sells

Rank Stock Value
1
CYBR
CyberArk
CYBR
+$70.7M
2
ADBE icon
Adobe
ADBE
+$61.7M
3
MSFT icon
Microsoft
MSFT
+$45.7M
4
WDAY icon
Workday
WDAY
+$42.6M
5
POOL icon
Pool Corp
POOL
+$41.7M

Sector Composition

Rank Sector Weight
1 Technology 27.36%
2 Financials 13.36%
3 Industrials 12.59%
4 Healthcare 10.97%
5 Consumer Discretionary 7.45%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
TSLA icon
76
Tesla
TSLA
$1.29T
$119M 0.32%
268,015
-15,537
-5% -$5.39M
IWF icon
77
iShares Russell 1000 Growth ETF
IWF
$128B
$117M 0.31%
1,003,192
+6,820
+0.7% +$759K
ORLY icon
78
O'Reilly Automotive
ORLY
$74.5B
$117M 0.31%
1,085,453
+5,841
+0.5% +$587K
UNP icon
79
Union Pacific
UNP
$174B
$114M 0.3%
484,001
-13,858
-3% -$3.12M
LYV icon
80
Live Nation Entertainment
LYV
$43.2B
$114M 0.3%
698,032
-4,079
-0.6% -$645K
LIN icon
81
Linde
LIN
$221B
$113M 0.3%
238,849
-1,122
-0.5% -$531K
CRWD icon
82
CrowdStrike
CRWD
$226B
$111M 0.29%
901,576
+202,364
+29% +$23M
ACN icon
83
Accenture
ACN
$110B
$110M 0.29%
447,619
-139,951
-24% -$36.5M
XOM icon
84
ExxonMobil
XOM
$657B
$109M 0.29%
963,274
-7,727
-0.8% -$859K
ITW icon
85
Illinois Tool Works
ITW
$83.3B
$107M 0.29%
412,195
-9,362
-2% -$2.44M
WM icon
86
Waste Management
WM
$90.5B
$107M 0.28%
484,597
+80,881
+20% +$18.2M
MCD icon
87
McDonald's
MCD
$195B
$105M 0.28%
343,959
+1,777
+0.5% +$541K
SPGI icon
88
S&P Global
SPGI
$121B
$104M 0.28%
214,509
+8,514
+4% +$4.56M
IUSV icon
89
iShares Core S&P US Value ETF
IUSV
$27.8B
$104M 0.28%
1,042,342
-7,098
-0.7% -$691K
CVX icon
90
Chevron
CVX
$386B
$104M 0.28%
668,728
+15,814
+2% +$2.45M
KO icon
91
Coca-Cola
KO
$373B
$101M 0.27%
1,521,663
-28,208
-2% -$1.94M
VRSK icon
92
Verisk Analytics
VRSK
$23.5B
$99.8M 0.27%
396,691
+13,394
+3% +$3.68M
AME icon
93
Ametek
AME
$59.3B
$99.5M 0.26%
529,273
-160,587
-23% -$29.5M
ROK icon
94
Rockwell Automation
ROK
$50.1B
$97.6M 0.26%
279,199
+2,270
+0.8% +$784K
VUG icon
95
Vanguard Morningstar Growth ETF
VUG
$229B
$97M 0.26%
1,213,356
+77,556
+7% +$5.93M
GD icon
96
General Dynamics
GD
$107B
$96.9M 0.26%
284,145
+4,569
+2% +$1.44M
QCOM icon
97
Qualcomm
QCOM
$171B
$96.4M 0.26%
579,279
+141,211
+32% +$22.4M
VTI icon
98
Vanguard Morningstar Total Stock Market ETF
VTI
$691B
$95.7M 0.25%
291,473
+21,135
+8% +$6.68M
MDB icon
99
MongoDB
MDB
$35.2B
$93.1M 0.25%
300,010
-61,122
-17% -$15.7M
PCOR icon
100
Procore
PCOR
$8.81B
$89.4M 0.24%
1,225,529
+123,106
+11% +$8.6M
2 3
4
5 6

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William Blair & Company's Q3 2025 Portfolio in Review

As of Q3 2025, William Blair & Company held 1,919 positions worth $37.6B, up 4.4% from $36B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q3 2025 filing shows 98 new, 697 increased, 774 reduced and 75 closed positions. Its largest new stake was Miami International Holdings: 363,765 shares worth $14.6M. The largest sale was CyberArk, an estimated $70.7M.

By sector, the portfolio is most concentrated in Technology at 27% of assets, down from 27% a quarter earlier, followed by Financials and Industrials.

  • William Blair & Company's largest Q3 2025 buy was Miami International Holdings: 363,765 shares worth $14.6M.
  • William Blair & Company added most to Meta Platforms (Facebook) in Q3 2025, an estimated $76.1M increase.
  • William Blair & Company's biggest Q3 2025 reduction was CyberArk, cutting an estimated $70.7M.
  • William Blair & Company fully exited Stride in Q3 2025, selling an estimated $7.47M.
  • William Blair & Company's ten largest holdings make up 26% of its $37.6B portfolio in Q3 2025.
  • William Blair & Company opened 98 new positions and closed 75 in Q3 2025.
  • William Blair & Company's portfolio value rose 4.4% quarter-over-quarter to $37.6B.

Based on William Blair & Company's 13F filing for Q3 2025, filed 12 Nov 2025.