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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
RDDT icon
1126
Reddit
RDDT
$30.7B
$659K ﹤0.01%
3,794
-42
-1% -$6.73K
SIVR icon
1127
abrdn Physical Silver Shares ETF
SIVR
$4.3B
$653K ﹤0.01%
11,617
-9,495
-45% -$661K
HAYW icon
1128
Hayward Holdings
HAYW
$2.7B
$650K ﹤0.01%
37,577
+2,351
+7% +$34.3K
BBAX icon
1129
JPMorgan BetaBuilders Developed Asia Pacific-ex Japan ETF
BBAX
$6.73B
$648K ﹤0.01%
10,827
+51
+0.5% +$3.13K
NGG icon
1130
National Grid
NGG
$75.3B
$647K ﹤0.01%
7,804
+445
+6% +$37.8K
TXT icon
1131
Textron
TXT
$13.9B
$646K ﹤0.01%
7,042
+405
+6% +$36.8K
IGF icon
1132
iShares Global Infrastructure ETF
IGF
$10.2B
$644K ﹤0.01%
9,672
+6,455
+201% +$433K
BAM icon
1133
Brookfield Asset Management
BAM
$73.2B
$643K ﹤0.01%
14,338
+215
+2% +$10.2K
DECK icon
1134
Deckers Outdoor
DECK
$10.6B
$642K ﹤0.01%
6,465
-283
-4% -$29.8K
VRRM icon
1135
Verra Mobility
VRRM
$538M
$641K ﹤0.01%
150,783
-61,830
-29% -$653K
TD icon
1136
Toronto Dominion Bank
TD
$199B
$639K ﹤0.01%
5,259
-5,087
-49% -$557K
MAIR
1137
Madison Air Solutions
MAIR
$12B
$638K ﹤0.01%
+16,365
New +$638K
NNN icon
1138
NNN REIT
NNN
$8.29B
$638K ﹤0.01%
+13,704
New +$612K
GTLB icon
1139
GitLab
GTLB
$8.18B
$632K ﹤0.01%
20,698
+356
+2% +$9.03K
EXPE icon
1140
Expedia Group
EXPE
$35.2B
$632K ﹤0.01%
2,469
+1,483
+150% +$352K
KHC icon
1141
Kraft Heinz
KHC
$29.3B
$632K ﹤0.01%
26,742
-11,112
-29% -$256K
CNQ icon
1142
Canadian Natural Resources
CNQ
$106B
$626K ﹤0.01%
+15,842
New +$720K
HBNC icon
1143
Horizon Bancorp
HBNC
$1.02B
$625K ﹤0.01%
31,288
+69
+0.2% +$1.27K
FXO icon
1144
First Trust Financials AlphaDEX Fund
FXO
$1.1B
$623K ﹤0.01%
9,980
– –
TPR icon
1145
Tapestry
TPR
$23.4B
$623K ﹤0.01%
4,254
+195
+5% +$27.9K
EWY icon
1146
iShares MSCI South Korea ETF
EWY
$27B
$622K ﹤0.01%
3,081
+1,983
+181% +$350K
HASI icon
1147
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.68B
$621K ﹤0.01%
15,899
-13,505
-46% -$540K
BPOP icon
1148
Popular Inc
BPOP
$10.5B
$618K ﹤0.01%
3,764
+71
+2% +$10.7K
GSLC icon
1149
Goldman Sachs ActiveBeta US Large Cap Equity ETF
GSLC
$15B
$618K ﹤0.01%
4,355
+40
+0.9% +$5.53K
SCCO icon
1150
Southern Copper
SCCO
$160B
$617K ﹤0.01%
3,585
+575
+19% +$103K
44 45
46
47 48

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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.