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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
CPB icon
1051
Campbell Soup
CPB
$6.37B
$828K ﹤0.01%
37,161
+7,804
+27% +$165K
ITRN icon
1052
Ituran Location and Control
ITRN
$1.02B
$824K ﹤0.01%
13,500
+89
+0.7% +$5.29K
ARW icon
1053
Arrow Electronics
ARW
$10.8B
$815K ﹤0.01%
3,821
+1,406
+58% +$281K
TEAM icon
1054
Atlassian
TEAM
$48B
$813K ﹤0.01%
10,445
-10,285
-50% -$841K
AAEQ
1055
Alpha Architect US Equity 2 ETF
AAEQ
$504M
$808K ﹤0.01%
+15,195
New +$786K
BCSF icon
1056
Bain Capital Specialty
BCSF
$718M
$807K ﹤0.01%
+64,468
New +$841K
BIL icon
1057
State Street SPDR Bloomberg 1-3 Month T-Bill ETF
BIL
$47B
$806K ﹤0.01%
8,799
+47
+0.5% +$4.3K
MTSI icon
1058
MACOM Technology Solutions
MTSI
$18.3B
$801K ﹤0.01%
2,106
-315
-13% -$104K
NJAN icon
1059
Innovator Growth-100 Power Buffer ETF January
NJAN
$353M
$801K ﹤0.01%
13,567
– –
TDVG icon
1060
T. Rowe Price Dividend Growth ETF
TDVG
$1.43B
$799K ﹤0.01%
16,292
+7,720
+90% +$366K
RACE icon
1061
Ferrari
RACE
$71.5B
$799K ﹤0.01%
2,145
+247
+13% +$85.9K
IDA icon
1062
Idacorp
IDA
$7.67B
$794K ﹤0.01%
5,249
+757
+17% +$109K
IEF icon
1063
iShares 7-10 Year Treasury Bond ETF
IEF
$41.4B
$793K ﹤0.01%
8,388
-363
-4% -$34.4K
EQPT
1064
EquipmentShare.com Inc
EQPT
$4.48B
$793K ﹤0.01%
40,345
+15,000
+59% +$321K
LINE
1065
Lineage Inc
LINE
$8.76B
$793K ﹤0.01%
18,329
+2,875
+19% +$113K
NFRA icon
1066
Northern Trust STOXX Global Broad Infrastructure ETF
NFRA
$3.08B
$790K ﹤0.01%
12,327
+11,886
+2,695% +$776K
HLT icon
1067
Hilton Worldwide
HLT
$69.3B
$789K ﹤0.01%
2,387
+1,070
+81% +$352K
IEX icon
1068
IDEX
IEX
$16.4B
$770K ﹤0.01%
3,395
+86
+3% +$18.2K
ZROZ icon
1069
PIMCO 25+ Year Zero Coupon US Treasury Index Exchange-Traded Fund
ZROZ
$1.61B
$768K ﹤0.01%
11,977
-992
-8% -$62.4K
XNTK icon
1070
State Street SPDR NYSE Technology ETF
XNTK
$1.87B
$766K ﹤0.01%
1,960
– –
MTZ icon
1071
MasTec
MTZ
$17.9B
$763K ﹤0.01%
1,835
+41
+2% +$15.7K
HPQ icon
1072
HP
HPQ
$30.5B
$763K ﹤0.01%
34,796
+2,737
+9% +$60.5K
XME icon
1073
State Street SPDR S&P Metals & Mining ETF
XME
$4.48B
$758K ﹤0.01%
7,084
-3,966
-36% -$466K
SVM
1074
Silvercorp Metals
SVM
$2.52B
$758K ﹤0.01%
75,000
-5,000
-6% -$60.3K
MAS icon
1075
Masco
MAS
$13.6B
$756K ﹤0.01%
9,291
+1,437
+18% +$100K
41 42
43
44 45

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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.