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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
PLTR icon
176
Palantir
PLTR
$411B
$31.6M 0.08%
172,996
+16,311
+10% +$2.64M
ETN icon
177
Eaton
ETN
$179B
$31.5M 0.08%
84,107
+1,515
+2% +$551K
FANG icon
178
Diamondback Energy
FANG
$56.2B
$31.4M 0.08%
219,537
+215,691
+5,608% +$30.7M
PDEC icon
179
Innovator US Equity Power Buffer ETF December
PDEC
$997M
$31.3M 0.08%
744,557
-22,020
-3% -$902K
IT icon
180
Gartner
IT
$11.3B
$31.1M 0.08%
118,194
+78,610
+199% +$22.9M
APD icon
181
Air Products & Chemicals
APD
$67.7B
$30.9M 0.08%
113,181
+2,877
+3% +$833K
NEE icon
182
NextEra Energy
NEE
$179B
$30.8M 0.08%
408,630
-3,837
-0.9% -$280K
XLF icon
183
State Street Financial Select Sector SPDR ETF
XLF
$59.1B
$29.9M 0.08%
554,152
+4,958
+0.9% +$263K
TRU icon
184
TransUnion
TRU
$15.2B
$29.7M 0.08%
354,523
+301,899
+574% +$27.4M
PSX icon
185
Phillips 66
PSX
$90B
$29.6M 0.08%
217,372
+15,651
+8% +$2.01M
XLK icon
186
State Street Technology Select Sector SPDR ETF
XLK
$124B
$29.5M 0.08%
209,250
+13,020
+7% +$1.72M
IOT icon
187
Samsara
IOT
$22.9B
$29.3M 0.08%
786,781
-7,327
-0.9% -$272K
PJUL icon
188
Innovator US Equity Power Buffer ETF July
PJUL
$1.29B
$29.1M 0.08%
638,473
+287,972
+82% +$12.9M
EW icon
189
Edwards Lifesciences
EW
$53.6B
$29M 0.08%
372,353
-17,780
-5% -$1.39M
VZ icon
190
Verizon
VZ
$195B
$28.9M 0.08%
656,725
+31,437
+5% +$1.36M
SPXC icon
191
SPX Corp
SPXC
$10.9B
$28.4M 0.08%
152,260
+3,402
+2% +$629K
COF icon
192
Capital One
COF
$136B
$28.2M 0.08%
132,796
-1,318
-1% -$289K
FSV icon
193
FirstService
FSV
$6.24B
$28M 0.07%
147,071
+1,672
+1% +$324K
IWB icon
194
iShares Russell 1000 ETF
IWB
$50.2B
$28M 0.07%
76,613
+361
+0.5% +$127K
SPOT icon
195
Spotify
SPOT
$101B
$27.5M 0.07%
39,453
+30,697
+351% +$21.5M
EHC icon
196
Encompass Health
EHC
$12.3B
$27.4M 0.07%
216,106
-1,413
-0.6% -$168K
AVAV icon
197
AeroVironment
AVAV
$9.81B
$27.4M 0.07%
87,139
+2,791
+3% +$722K
TSM icon
198
TSMC
TSM
$2.23T
$26.8M 0.07%
96,048
-1,154
-1% -$282K
IAU icon
199
iShares Gold Trust
IAU
$65.4B
$26.6M 0.07%
365,351
+74,000
+25% +$4.83M
DOCS icon
200
Doximity
DOCS
$4.45B
$26.5M 0.07%
362,740
+345,390
+1,991% +$22.5M
6 7
8
9 10

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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.