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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
+19.08%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+606.62%
AUM
$38.4B
AUM Growth
+$3.49B
Cap. Flow
-$792M
Cap. Flow %
-2.06%
Top 10 Hldgs %
26.32%
Holding
2,083
New
163
Increased
891
Reduced
708
Closed
85

Top Buys

Rank Stock Value
1
HONA
Honeywell Aerospace
HONA
+$100M
2
ANET icon
Arista Networks
ANET
+$71.2M
3
RSP icon
Invesco S&P 500 Equal Weight ETF
RSP
+$61.8M
4
VTI icon
Vanguard Morningstar Total Stock Market ETF
VTI
+$55.8M
5
MIAX
Miami International Holdings
MIAX
+$49.4M

Top Sells

Rank Stock Value
1
XOM icon
ExxonMobil
XOM
+$161M
2
CPRT icon
Copart
CPRT
+$62M
3
DHR icon
Danaher
DHR
+$59.1M
4
AAPL icon
Apple
AAPL
+$57M
5
VEEV icon
Veeva Systems
VEEV
+$52.2M

Sector Composition

Rank Sector Weight
1 Technology 24.38%
2 Miscellaneous 18.67%
3 Industrials 15.24%
4 Financials 11.07%
5 Healthcare 9.11%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
APP icon
126
Applovin
APP
$112B
$62.2M 0.16%
120,816
-19,135
-14% -$9.23M
ROL icon
127
Rollins
ROL
$17B
$61.6M 0.16%
1,476,727
-788,286
-35% -$40.3M
ASML icon
128
ASML
ASML
$605B
$61.5M 0.16%
30,906
+18,494
+149% +$29.4M
RBA icon
129
RB Global
RBA
$15.6B
$61.3M 0.16%
526,577
-43,810
-8% -$4.61M
CPRT icon
130
Copart
CPRT
$29.4B
$60.7M 0.16%
2,151,952
-1,919,038
-47% -$62M
TJX icon
131
TJX Companies
TJX
$139B
$59.8M 0.16%
394,916
+270
+0.1% +$42.7K
SHOP icon
132
Shopify
SHOP
$172B
$59.6M 0.16%
521,868
-105,556
-17% -$12M
MCK icon
133
McKesson
MCK
$106B
$58.9M 0.15%
77,919
-2,123
-3% -$1.68M
NDAQ icon
134
Nasdaq
NDAQ
$51.2B
$58.8M 0.15%
745,415
-280,595
-27% -$24.6M
AMAT icon
135
Applied Materials
AMAT
$337B
$57.8M 0.15%
79,958
+762
+1% +$352K
VWO icon
136
Vanguard FTSE Emerging Markets ETF
VWO
$126B
$57.5M 0.15%
963,167
+120,982
+14% +$7.11M
ALL icon
137
Allstate
ALL
$65.4B
$57.4M 0.15%
241,165
-17,614
-7% -$3.83M
BLK icon
138
Blackrock
BLK
$165B
$56.7M 0.15%
59,013
-275
-0.5% -$284K
IWD icon
139
iShares Russell 1000 Value ETF
IWD
$83.4B
$56.5M 0.15%
232,981
-26,667
-10% -$6.21M
MSI icon
140
Motorola Solutions
MSI
$78.5B
$54.7M 0.14%
131,772
+9,029
+7% +$3.78M
AMGN icon
141
Amgen
AMGN
$206B
$54.6M 0.14%
150,777
-5,221
-3% -$1.79M
MDY icon
142
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$26B
$53.5M 0.14%
76,091
+414
+0.5% +$277K
EPD icon
143
Enterprise Products Partners
EPD
$83.6B
$53.5M 0.14%
1,454,489
+132
+0% +$4.98K
MCHP icon
144
Microchip Technology
MCHP
$38.8B
$52.9M 0.14%
579,940
-9,928
-2% -$885K
IJH icon
145
iShares Core S&P Mid-Cap ETF
IJH
$123B
$52.9M 0.14%
685,526
-1,783
-0.3% -$131K
EMR icon
146
Emerson Electric
EMR
$82.7B
$50.7M 0.13%
354,500
-35,490
-9% -$5M
TXN icon
147
Texas Instruments
TXN
$241B
$50.6M 0.13%
169,805
+1,333
+0.8% +$370K
ADP icon
148
Automatic Data Processing
ADP
$110B
$50.4M 0.13%
225,199
-2,989
-1% -$639K
PM icon
149
Philip Morris
PM
$304B
$48.8M 0.13%
269,614
+30,811
+13% +$5.34M
INTC icon
150
Intel
INTC
$514B
$48.1M 0.13%
344,628
-12,518
-4% -$1.27M
4 5
6
7 8

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William Blair & Company's Q2 2026 Portfolio in Review

As of Q2 2026, William Blair & Company held 2,083 positions worth $38.4B, up 10% from $34.9B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q2 2026 filing shows 163 new, 891 increased, 708 reduced and 85 closed positions. Its largest new stake was Honeywell Aerospace: 454,071 shares worth $100M. The largest sale was ExxonMobil, an estimated $161M.

By sector, the portfolio is most concentrated in Technology at 24% of assets, up from 22% a quarter earlier, followed by Miscellaneous and Industrials.

  • William Blair & Company's largest Q2 2026 buy was Honeywell Aerospace: 454,071 shares worth $100M.
  • William Blair & Company added most to Arista Networks in Q2 2026, an estimated $71.2M increase.
  • William Blair & Company's biggest Q2 2026 reduction was Copart, cutting an estimated $62M.
  • William Blair & Company fully exited ExxonMobil in Q2 2026, selling an estimated $161M.
  • William Blair & Company's ten largest holdings make up 26% of its $38.4B portfolio in Q2 2026.
  • William Blair & Company opened 163 new positions and closed 85 in Q2 2026.
  • William Blair & Company's portfolio value rose 10% quarter-over-quarter to $38.4B.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.