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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
IJT icon
726
iShares S&P Small-Cap 600 Growth ETF
IJT
$7.91B
$2.35M 0.01%
13,154
+510
+4% +$82.7K
INFQ
727
Infleqtion Inc
INFQ
$2.84B
$2.33M 0.01%
+174,983
New +$2.41M
KJUL icon
728
Innovator US Small Cap Power Buffer ETF July
KJUL
$227M
$2.32M 0.01%
68,387
– –
FRPT icon
729
Freshpet
FRPT
$3.01B
$2.31M 0.01%
39,043
+2,579
+7% +$148K
RIO icon
730
Rio Tinto
RIO
$156B
$2.27M 0.01%
23,889
+1,757
+8% +$178K
CCI icon
731
Crown Castle
CCI
$31.3B
$2.26M 0.01%
29,802
+1,187
+4% +$104K
ROBO icon
732
ROBO Global Robotics & Automation Index ETF
ROBO
$1.97B
$2.23M 0.01%
26,007
+13,556
+109% +$1.11M
GAIN icon
733
Gladstone Investment Corp
GAIN
$630M
$2.22M 0.01%
143,679
-2,075
-1% -$32.6K
GEHC icon
734
GE HealthCare
GEHC
$28.8B
$2.2M 0.01%
34,359
-75,147
-69% -$4.94M
MTB icon
735
M&T Bank
MTB
$32.7B
$2.18M 0.01%
9,176
-24
-0.3% -$5.25K
LEN icon
736
Lennar Class A
LEN
$19B
$2.17M 0.01%
23,951
+2,078
+10% +$186K
PEG icon
737
Public Service Enterprise Group
PEG
$34.9B
$2.16M 0.01%
26,639
+2,648
+11% +$212K
GKOS icon
738
Glaukos
GKOS
$9.71B
$2.16M 0.01%
15,461
-124
-0.8% -$15.7K
MSTR icon
739
Strategy Inc
MSTR
$49.3B
$2.15M 0.01%
24,784
-612
-2% -$88.8K
CORZW icon
740
Core Scientific Inc Tranche 1 Warrants
CORZW
$993M
$2.15M 0.01%
114,389
-120
-0.1% -$2.02K
XES icon
741
State Street SPDR S&P Oil & Gas Equipment & Services ETF
XES
$394M
$2.15M 0.01%
19,166
+17,193
+871% +$2.09M
TREX icon
742
Trex
TREX
$4.36B
$2.14M 0.01%
42,785
-4,769
-10% -$198K
IBRX icon
743
ImmunityBio
IBRX
$8.29B
$2.12M 0.01%
241,956
+15
+0% +$114
WY icon
744
Weyerhaeuser
WY
$15.8B
$2.11M 0.01%
88,067
+7,818
+10% +$190K
MPLX icon
745
MPLX
MPLX
$58.6B
$2.11M 0.01%
37,418
-1,493
-4% -$83.3K
HUBB icon
746
Hubbell
HUBB
$23.1B
$2.1M 0.01%
4,012
+405
+11% +$205K
CALF icon
747
Pacer US Small Cap Cash Cows 100 ETF
CALF
$3.84B
$2.1M 0.01%
41,474
-788
-2% -$38K
KR icon
748
Kroger
KR
$36.5B
$2.09M 0.01%
37,612
-71,602
-66% -$4.67M
AFL icon
749
Aflac
AFL
$58.7B
$2.09M 0.01%
17,795
-952
-5% -$110K
LSCC icon
750
Lattice Semiconductor
LSCC
$15B
$2.08M 0.01%
13,611
+38
+0.3% +$4.9K
28 29
30
31 32

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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.