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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
CWB icon
701
State Street SPDR Bloomberg Convertible Securities ETF
CWB
$5.54B
$2.56M 0.01%
23,729
-275
-1% -$28.5K
NTAP icon
702
NetApp
NTAP
$37.5B
$2.55M 0.01%
16,453
-195
-1% -$25.5K
GBCI icon
703
Glacier Bancorp
GBCI
$5.93B
$2.54M 0.01%
49,244
+222
+0.5% +$10.7K
SHV icon
704
iShares 0-1 Year Treasury Bond ETF
SHV
$21.1B
$2.53M 0.01%
22,909
+468
+2% +$51.6K
DFTX
705
Definium Therapeutics
DFTX
$5.07B
$2.52M 0.01%
53,588
-107
-0.2% -$2.64K
IONS icon
706
Ionis Pharmaceuticals
IONS
$7.75B
$2.51M 0.01%
31,606
-2,251
-7% -$169K
PNOV icon
707
Innovator US Equity Power Buffer ETF November
PNOV
$887M
$2.49M 0.01%
56,187
-1,703
-3% -$74K
DHS icon
708
WisdomTree US High Dividend Fund
DHS
$1.6B
$2.49M 0.01%
21,895
+100
+0.5% +$11.1K
PCAR icon
709
PACCAR
PCAR
$63.6B
$2.48M 0.01%
20,680
-585
-3% -$69K
NVO
710
Novo Nordisk
NVO
$186B
$2.48M 0.01%
51,709
+7,697
+17% +$331K
VONE icon
711
Vanguard Russell 1000 ETF
VONE
$8.58B
$2.47M 0.01%
7,289
+1,997
+38% +$655K
NEM icon
712
Newmont
NEM
$130B
$2.46M 0.01%
26,341
+2,215
+9% +$241K
CAG icon
713
Conagra Brands
CAG
$7.28B
$2.45M 0.01%
182,296
+37,794
+26% +$528K
TMUS icon
714
T-Mobile US
TMUS
$192B
$2.45M 0.01%
14,625
-6,979
-32% -$1.32M
ATO icon
715
Atmos Energy
ATO
$27.5B
$2.45M 0.01%
14,214
+7,927
+126% +$1.42M
STVN icon
716
Stevanato
STVN
$5.94B
$2.44M 0.01%
134,831
+12,793
+10% +$216K
HYMB icon
717
State Street SPDR Nuveen ICE High Yield Municipal Bond ETF
HYMB
$3.42B
$2.43M 0.01%
95,682
+3,085
+3% +$77.5K
SPOT icon
718
Spotify
SPOT
$115B
$2.41M 0.01%
5,258
-5,829
-53% -$2.78M
DASH icon
719
DoorDash
DASH
$84.5B
$2.41M 0.01%
13,053
+1,497
+13% +$247K
FA icon
720
First Advantage
FA
$3.72B
$2.39M 0.01%
132,438
+189
+0.1% +$2.74K
FLEX icon
721
Flex
FLEX
$41B
$2.38M 0.01%
14,712
-2,553
-15% -$310K
MLI icon
722
Mueller Industries
MLI
$13.4B
$2.38M 0.01%
38,704
+8,024
+26% +$526K
WEX icon
723
WEX
WEX
$6.75B
$2.38M 0.01%
16,861
-1,983
-11% -$294K
SCZ icon
724
iShares MSCI EAFE Small-Cap ETF
SCZ
$13B
$2.36M 0.01%
28,736
+2,881
+11% +$241K
MGV icon
725
Vanguard Morningstar Mega Cap Value ETF
MGV
$13.6B
$2.35M 0.01%
14,391
-4,593
-24% -$713K
27 28
29
30 31

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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.