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William Blair & Company

William Blair & Company Portfolio holdings

AUM $34.9B
1-Year Est. Return 18.88%
This Fund
S&P 500
This Quarter Est. Return
+12.61%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+563.35%
AUM
$36B
AUM Growth
+$2.85B
Cap. Flow
-$222M
Cap. Flow %
-0.62%
Top 10 Hldgs %
24.91%
Holding
1,911
New
111
Increased
662
Reduced
757
Closed
87

Top Buys

Rank Stock Value
1
GEV icon
GE Vernova
GEV
+$116M
2
BA icon
Boeing
BA
+$34M
3
CWAN
Clearwater Analytics
CWAN
+$31.2M
4
NVDA icon
NVIDIA
NVDA
+$27.5M
5
NET icon
Cloudflare
NET
+$26.2M

Top Sells

Rank Stock Value
1
XYZ
Block Inc
XYZ
+$79.4M
2
ZTS icon
Zoetis
ZTS
+$41.3M
3
ACN icon
Accenture
ACN
+$40.8M
4
IJH icon
iShares Core S&P Mid-Cap ETF
IJH
+$40.7M
5
UNH icon
UnitedHealth
UNH
+$36.4M

Sector Composition

Rank Sector Weight
1 Technology 27.47%
2 Financials 13.92%
3 Industrials 12.94%
4 Healthcare 11.51%
5 Consumer Discretionary 7.98%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
CYBR
101
DELISTED
CyberArk
CYBR
$81.4M 0.23%
200,178
-4,530
-2% -$1.65M
RBC icon
102
RBC Bearings
RBC
$18B
$80.7M 0.22%
209,793
-692
-0.3% -$244K
ADP icon
103
Automatic Data Processing
ADP
$109B
$78.4M 0.22%
254,106
-4,713
-2% -$1.45M
AXON
104
Axon Enterprise
AXON
$43.7B
$78.3M 0.22%
94,517
+6,933
+8% +$4.72M
MSI icon
105
Motorola Solutions
MSI
$77.9B
$77.5M 0.22%
184,237
-7,793
-4% -$3.26M
HEI icon
106
HEICO Corp
HEI
$51.2B
$76.6M 0.21%
233,648
+3,694
+2% +$1.02M
ALL icon
107
Allstate
ALL
$70.3B
$76.2M 0.21%
378,710
-14,206
-4% -$2.83M
MDB icon
108
MongoDB
MDB
$30.1B
$75.8M 0.21%
361,132
-85,893
-19% -$15.9M
UNH icon
109
UnitedHealth
UNH
$368B
$75.8M 0.21%
242,940
-95,137
-28% -$36.4M
PCOR icon
110
Procore
PCOR
$8.38B
$75.4M 0.21%
1,102,423
+63,788
+6% +$4.17M
WAB icon
111
Wabtec
WAB
$49.8B
$73.8M 0.2%
352,345
-20,293
-5% -$3.9M
BLK icon
112
Blackrock
BLK
$174B
$72.9M 0.2%
69,482
+3,674
+6% +$3.47M
EFA icon
113
iShares MSCI EAFE ETF
EFA
$79.4B
$72.6M 0.2%
812,483
+8,149
+1% +$696K
TOST icon
114
Toast
TOST
$20.3B
$71.4M 0.2%
1,612,099
-18,968
-1% -$745K
RSP icon
115
Invesco S&P 500 Equal Weight ETF
RSP
$98.8B
$70.5M 0.2%
387,870
+5,078
+1% +$876K
QCOM icon
116
Qualcomm
QCOM
$168B
$69.8M 0.19%
438,068
-211,605
-33% -$31.2M
IWV icon
117
iShares Russell 3000 ETF
IWV
$20.2B
$69.6M 0.19%
198,408
-955
-0.5% -$310K
LOW icon
118
Lowe's Companies
LOW
$122B
$69.4M 0.19%
313,010
-8,857
-3% -$1.98M
DE icon
119
Deere & Co
DE
$166B
$69.1M 0.19%
135,982
+11,892
+10% +$5.82M
MRK icon
120
Merck
MRK
$318B
$69.1M 0.19%
872,467
-68,932
-7% -$5.48M
SCHW
121
Charles Schwab
SCHW
$187B
$68.7M 0.19%
752,699
-111,138
-13% -$9.31M
PEP icon
122
PepsiCo
PEP
$188B
$68.3M 0.19%
517,330
-12,955
-2% -$1.75M
ITOT icon
123
iShares Core S&P Total US Stock Market ETF
ITOT
$97B
$67M 0.19%
495,913
+13,341
+3% +$1.66M
HON icon
124
Honeywell
HON
$76.6B
$66.6M 0.19%
303,492
-457
-0.2% -$92.5K
CW icon
125
Curtiss-Wright
CW
$26.7B
$66.1M 0.18%
135,371
+4,584
+4% +$1.81M
3 4
5
6 7

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William Blair & Company's Q2 2025 Portfolio in Review

As of Q2 2025, William Blair & Company held 1,911 positions worth $36B, up 8.6% from $33.2B the previous quarter. Its ten largest holdings account for 25% of the portfolio.

William Blair & Company's Q2 2025 filing shows 111 new, 662 increased, 757 reduced and 87 closed positions. Its largest new stake was Affirm: 304,959 shares worth $21.1M. The largest sale was Block Inc, an estimated $79.4M.

By sector, the portfolio is most concentrated in Technology at 27% of assets, up from 26% a quarter earlier, followed by Financials and Industrials.

  • William Blair & Company's largest Q2 2025 buy was Affirm: 304,959 shares worth $21.1M.
  • William Blair & Company added most to GE Vernova in Q2 2025, an estimated $116M increase.
  • William Blair & Company's biggest Q2 2025 reduction was Block Inc, cutting an estimated $79.4M.
  • William Blair & Company fully exited Discover Financial Services in Q2 2025, selling an estimated $5.21M.
  • William Blair & Company's ten largest holdings make up 25% of its $36B portfolio in Q2 2025.
  • William Blair & Company opened 111 new positions and closed 87 in Q2 2025.
  • William Blair & Company's portfolio value rose 8.6% quarter-over-quarter to $36B.

Based on William Blair & Company's 13F filing for Q2 2025, filed 24 Jul 2025.