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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
GLD icon
126
SPDR Gold Trust
GLD
$144B
$63.3M 0.17%
178,163
+34,108
+24% +$10.9M
WAB icon
127
Wabtec
WAB
$49.9B
$62.6M 0.17%
312,237
-40,108
-11% -$7.92M
ULS icon
128
UL Solutions
ULS
$15.5B
$62.5M 0.17%
882,301
+133,730
+18% +$9.11M
RTX icon
129
RTX Corp
RTX
$300B
$61.5M 0.16%
367,319
+6,496
+2% +$1.01M
RMD icon
130
ResMed
RMD
$32.8B
$61.3M 0.16%
223,843
-12,441
-5% -$3.4M
TOST icon
131
Toast
TOST
$19.7B
$59M 0.16%
1,616,065
+3,966
+0.2% +$172K
CMG icon
132
Chipotle Mexican Grill
CMG
$41.3B
$58.6M 0.16%
1,496,244
-815,336
-35% -$36.7M
COIN icon
133
Coinbase
COIN
$39.3B
$56.2M 0.15%
166,540
+46,681
+39% +$15.8M
CSCO icon
134
Cisco
CSCO
$488B
$55.8M 0.15%
815,801
+9,491
+1% +$647K
CAT icon
135
Caterpillar
CAT
$393B
$55.2M 0.15%
115,616
+2,072
+2% +$885K
GWW icon
136
W.W. Grainger
GWW
$61.5B
$54.7M 0.15%
57,404
+1,122
+2% +$1.13M
NDAQ icon
137
Nasdaq
NDAQ
$53.5B
$54.5M 0.15%
616,622
+34,524
+6% +$3.2M
BAC icon
138
Bank of America
BAC
$453B
$54.4M 0.14%
1,054,612
-43,108
-4% -$2.1M
HON icon
139
Honeywell
HON
$74.6B
$54.2M 0.14%
273,378
-30,114
-10% -$6.29M
TJX icon
140
TJX Companies
TJX
$169B
$53.6M 0.14%
370,944
+298
+0.1% +$39.6K
MU icon
141
Micron Technology
MU
$1.03T
$50.2M 0.13%
299,892
+5,934
+2% +$759K
IUSG icon
142
iShares Core S&P US Growth ETF
IUSG
$33.7B
$49.5M 0.13%
300,707
+26,271
+10% +$4.13M
BRK.A icon
143
Berkshire Hathaway Class A
BRK.A
$1.09T
$49M 0.13%
65
-5
-7% -$3.63M
USFR icon
144
WisdomTree Floating Rate Treasury Fund
USFR
$18.4B
$48.9M 0.13%
972,148
-36,815
-4% -$1.85M
SDVY icon
145
First Trust SMID Cap Rising Dividend Achievers ETF
SDVY
$11.8B
$48.7M 0.13%
1,280,526
+15,306
+1% +$568K
EMR icon
146
Emerson Electric
EMR
$91.4B
$48.7M 0.13%
370,949
-6,695
-2% -$913K
IWD icon
147
iShares Russell 1000 Value ETF
IWD
$84B
$48.4M 0.13%
237,715
+4,323
+2% +$860K
DIS icon
148
Walt Disney
DIS
$178B
$47.8M 0.13%
417,811
-11,808
-3% -$1.39M
CHWY icon
149
Chewy
CHWY
$9.15B
$46.3M 0.12%
1,144,811
+75,348
+7% +$2.91M
MDY icon
150
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27.2B
$46M 0.12%
77,101
-1,265
-2% -$742K
4 5
6
7 8

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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.