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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
TMDX icon
901
Transmedics
TMDX
$3.05B
$1.25M ﹤0.01%
18,859
-155,158
-89% -$13.1M
B
902
Barrick Mining
B
$70.3B
$1.25M ﹤0.01%
34,042
-14,194
-29% -$582K
OPCH icon
903
Option Care Health
OPCH
$3.52B
$1.25M ﹤0.01%
59,516
-9,108
-13% -$212K
COO icon
904
Cooper Companies
COO
$10.1B
$1.25M ﹤0.01%
17,370
-2,495
-13% -$163K
ASTH icon
905
Astrana Health
ASTH
$1.9B
$1.24M ﹤0.01%
26,686
-5,184
-16% -$187K
NXPI icon
906
NXP Semiconductors
NXPI
$57.1B
$1.24M ﹤0.01%
4,406
-149
-3% -$41.1K
IEUR icon
907
iShares Core MSCI Europe ETF
IEUR
$9.09B
$1.23M ﹤0.01%
16,314
+2,536
+18% +$189K
SFM icon
908
Sprouts Farmers Market
SFM
$6.85B
$1.22M ﹤0.01%
14,481
+749
+5% +$60.6K
JEF icon
909
Jefferies Financial Group
JEF
$11.3B
$1.22M ﹤0.01%
24,489
+6,188
+34% +$319K
WBD icon
910
Warner Bros
WBD
$70.3B
$1.22M ﹤0.01%
45,717
-7,716
-14% -$209K
ARKK icon
911
ARK Innovation ETF
ARKK
$6.44B
$1.22M ﹤0.01%
15,060
-1,383
-8% -$106K
PPG icon
912
PPG Industries
PPG
$23.3B
$1.22M ﹤0.01%
10,027
-500
-5% -$55.7K
MSCI icon
913
MSCI
MSCI
$39.6B
$1.21M ﹤0.01%
2,167
+1,203
+125% +$702K
TLT icon
914
iShares 20+ Year Treasury Bond ETF
TLT
$46.4B
$1.21M ﹤0.01%
14,020
+584
+4% +$50.1K
PCYO icon
915
Pure Cycle
PCYO
$268M
$1.21M ﹤0.01%
112,965
-32,311
-22% -$353K
DSGX icon
916
Descartes Systems
DSGX
$6.83B
$1.21M ﹤0.01%
17,471
-11,889
-40% -$849K
GSK icon
917
GSK
GSK
$100B
$1.19M ﹤0.01%
22,756
+7,663
+51% +$405K
CIVB icon
918
Civista Bancshares
CIVB
$573M
$1.19M ﹤0.01%
42,122
+97
+0.2% +$2.46K
CRDF icon
919
Cardiff Oncology
CRDF
$104M
$1.19M ﹤0.01%
912,513
-9,894
-1% -$15.7K
TLN
920
Talen Energy Corp
TLN
$13.5B
$1.18M ﹤0.01%
3,078
+391
+15% +$143K
VFH icon
921
Vanguard Financials ETF
VFH
$13.3B
$1.18M ﹤0.01%
8,947
-7,221
-45% -$921K
IT icon
922
Gartner
IT
$12.4B
$1.18M ﹤0.01%
9,069
-5,437
-37% -$819K
BELFB
923
Bel Fuse Inc Class B
BELFB
$3.35B
$1.17M ﹤0.01%
3,528
+3
+0.1% +$811
ETON icon
924
Eton Pharmaceutcials
ETON
$1.57B
$1.17M ﹤0.01%
32,419
+19
+0.1% +$557
DBEF icon
925
Xtrackers MSCI EAFE Hedged Equity ETF
DBEF
$9.19B
$1.17M ﹤0.01%
21,408
-1,195
-5% -$62.6K
35 36
37
38 39

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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.