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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
TXRH icon
1176
Texas Roadhouse
TXRH
$11.1B
$572K ﹤0.01%
+2,961
New +$504K
SGI
1177
Somnigroup International
SGI
$13.8B
$568K ﹤0.01%
7,247
-3,722
-34% -$273K
HRMY icon
1178
Harmony Biosciences
HRMY
$2.42B
$566K ﹤0.01%
15,557
+1,168
+8% +$36.8K
CPAY icon
1179
Corpay
CPAY
$27B
$566K ﹤0.01%
1,697
+183
+12% +$60.8K
MRNA icon
1180
Moderna
MRNA
$57B
$565K ﹤0.01%
8,064
+726
+10% +$37.6K
TLTD icon
1181
Northern Trust Morningstar Developed Markets ex-US Factor Tilt ETF
TLTD
$677M
$565K ﹤0.01%
5,756
-20
-0.3% -$1.99K
FHN icon
1182
First Horizon
FHN
$11.6B
$564K ﹤0.01%
22,014
+6,207
+39% +$151K
AMTM
1183
Amentum Holdings
AMTM
$4.93B
$564K ﹤0.01%
27,278
-22,020
-45% -$533K
JMST icon
1184
JPMorgan Ultra-Short Municipal Income ETF
JMST
$7.43B
$564K ﹤0.01%
11,055
+1,136
+11% +$57.8K
IYJ icon
1185
iShares US Industrials ETF
IYJ
$1.91B
$564K ﹤0.01%
3,383
– –
BAC.PRL icon
1186
Bank of America Series L
BAC.PRL
$3.92B
$562K ﹤0.01%
448
-46
-9% -$56.1K
AEE icon
1187
Ameren
AEE
$28.5B
$562K ﹤0.01%
4,968
+88
+2% +$9.72K
ODC icon
1188
Oil-Dri
ODC
$1.24B
$561K ﹤0.01%
5,487
+1
+0% +$80
GEW
1189
Cambria Global EW ETF
GEW
$143M
$561K ﹤0.01%
10,250
– –
CWI icon
1190
State Street SPDR MSCI ACWI ex-US ETF
CWI
$2.83B
$560K ﹤0.01%
13,770
+139
+1% +$5.51K
ZION icon
1191
Zions Bancorporation
ZION
$9.87B
$559K ﹤0.01%
8,080
+948
+13% +$59.8K
DBC icon
1192
Invesco DB Commodity Index Tracking Fund
DBC
$2B
$559K ﹤0.01%
20,962
– –
PEN icon
1193
Penumbra
PEN
$12.5B
$559K ﹤0.01%
1,769
-37
-2% -$12K
MTDR icon
1194
Matador Resources
MTDR
$7.85B
$552K ﹤0.01%
11,091
+5,892
+113% +$335K
ACWV icon
1195
iShares MSCI Global Min Vol Factor ETF
ACWV
$3.37B
$551K ﹤0.01%
4,584
– –
THFF icon
1196
First Financial Corp
THFF
$930M
$550K ﹤0.01%
7,101
+60
+0.9% +$4.14K
AEIS icon
1197
Advanced Energy
AEIS
$9.83B
$547K ﹤0.01%
1,468
-2,211
-60% -$773K
OFRM
1198
Once Upon a Farm PBC
OFRM
$700M
$546K ﹤0.01%
+26,641
New +$436K
MGC icon
1199
Vanguard Morningstar Mega Cap ETF
MGC
$10.2B
$543K ﹤0.01%
1,983
-3
-0.2% -$797
GMED icon
1200
Globus Medical
GMED
$10.1B
$542K ﹤0.01%
6,865
-83
-1% -$7.05K
46 47
48
49 50

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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.