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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
AIZ icon
1151
Assurant
AIZ
$14.1B
$617K ﹤0.01%
2,296
-54
-2% -$13.2K
CNC icon
1152
Centene
CNC
$33.4B
$611K ﹤0.01%
+9,519
New +$509K
CMTV
1153
Community BanCorp
CMTV
$233M
$610K ﹤0.01%
15,602
– –
GSBD icon
1154
Goldman Sachs BDC
GSBD
$1.09B
$609K ﹤0.01%
+64,280
New +$597K
SONY icon
1155
Sony
SONY
$140B
$607K ﹤0.01%
30,266
+1,631
+6% +$34.4K
BBCP icon
1156
Concrete Pumping Holdings
BBCP
$517M
$605K ﹤0.01%
50,169
+96
+0.2% +$824
BEP icon
1157
Brookfield Renewable
BEP
$8.65B
$604K ﹤0.01%
17,392
-573
-3% -$19.9K
BBVA icon
1158
Banco Bilbao Vizcaya Argentaria
BBVA
$159B
$604K ﹤0.01%
24,094
+13,685
+131% +$312K
FTCS icon
1159
First Trust Capital Strength ETF
FTCS
$7.71B
$604K ﹤0.01%
6,428
-169
-3% -$15.8K
UHAL.B icon
1160
U-Haul Holding Co Series N
UHAL.B
$10.9B
$603K ﹤0.01%
10,452
+3,061
+41% +$152K
SRBK icon
1161
SR Bancorp
SRBK
$143M
$600K ﹤0.01%
30,510
+11
+0% +$203
LYB icon
1162
LyondellBasell Industries
LYB
$21.1B
$594K ﹤0.01%
11,287
-53
-0.5% -$3.66K
NJUL icon
1163
Innovator Growth-100 Power Buffer ETF July
NJUL
$275M
$591K ﹤0.01%
7,628
– –
GBDC icon
1164
Golub Capital BDC
GBDC
$3.23B
$590K ﹤0.01%
45,826
– –
WING icon
1165
Wingstop
WING
$2.75B
$589K ﹤0.01%
3,399
-3,338
-50% -$526K
EPP icon
1166
iShares MSCI Pacific ex Japan ETF
EPP
$2.25B
$588K ﹤0.01%
11,035
-344
-3% -$18.9K
UI icon
1167
Ubiquiti
UI
$34.1B
$587K ﹤0.01%
1,099
-136
-11% -$103K
LEN.B icon
1168
Lennar Class B
LEN.B
$18.9B
$586K ﹤0.01%
6,605
+210
+3% +$18.3K
CRL icon
1169
Charles River Laboratories
CRL
$13B
$586K ﹤0.01%
2,583
-1,992
-44% -$355K
UNM icon
1170
Unum
UNM
$15.2B
$585K ﹤0.01%
6,545
+1,507
+30% +$125K
EWU icon
1171
iShares MSCI United Kingdom ETF
EWU
$3.71B
$585K ﹤0.01%
12,671
-699
-5% -$32.7K
LECO icon
1172
Lincoln Electric
LECO
$13.8B
$581K ﹤0.01%
2,187
+362
+20% +$94.7K
SRRK icon
1173
Scholar Rock
SRRK
$6.09B
$580K ﹤0.01%
10,546
+243
+2% +$11.7K
OMF icon
1174
OneMain Financial
OMF
$7.08B
$578K ﹤0.01%
+9,479
New +$534K
JAZZ icon
1175
Jazz Pharmaceuticals
JAZZ
$15.6B
$576K ﹤0.01%
2,392
+601
+34% +$132K
45 46
47
48 49

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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.