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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
BRK.A icon
151
Berkshire Hathaway Class A
BRK.A
$1.09T
$47.2M 0.12%
63
-1
-2% -$721K
ATI icon
152
ATI
ATI
$27.1B
$45.7M 0.12%
231,946
-5,050
-2% -$856K
MDLZ icon
153
Mondelez International
MDLZ
$79.7B
$44.9M 0.12%
776,142
-26,302
-3% -$1.58M
ORCL icon
154
Oracle
ORCL
$417B
$44.8M 0.12%
305,552
-45,552
-13% -$8.26M
VO icon
155
Vanguard Morningstar Mid-Cap ETF
VO
$105B
$44.7M 0.12%
555,266
+5,902
+1% +$458K
VRT icon
156
Vertiv
VRT
$91.4B
$44.5M 0.12%
132,835
+8,056
+6% +$2.55M
SMMD icon
157
iShares Russell 2500 ETF
SMMD
$3.83B
$44M 0.11%
480,198
+65,787
+16% +$5.65M
NET icon
158
Cloudflare
NET
$118B
$43.2M 0.11%
176,202
+6,117
+4% +$1.34M
NEE icon
159
NextEra Energy
NEE
$170B
$43.1M 0.11%
490,853
+4,530
+0.9% +$410K
TYL icon
160
Tyler Technologies
TYL
$13.8B
$42.9M 0.11%
146,784
-80,594
-35% -$25.5M
USFR icon
161
WisdomTree Floating Rate Treasury Fund
USFR
$19.3B
$42.7M 0.11%
848,836
-12,306
-1% -$620K
MS icon
162
Morgan Stanley
MS
$337B
$42.3M 0.11%
202,578
+46,418
+30% +$9.19M
ZTS icon
163
Zoetis
ZTS
$30.4B
$42M 0.11%
583,869
-211,428
-27% -$19.9M
MPWR icon
164
Monolithic Power Systems
MPWR
$60.7B
$41.8M 0.11%
30,259
-298
-1% -$447K
SIMO icon
165
Silicon Motion
SIMO
$9.65B
$41.7M 0.11%
125,176
+21,997
+21% +$5.1M
LOW icon
166
Lowe's Companies
LOW
$111B
$41.7M 0.11%
188,931
-67,483
-26% -$15.3M
CRM icon
167
Salesforce
CRM
$214B
$40.1M 0.1%
256,268
-132,740
-34% -$23.3M
ROP icon
168
Roper Technologies
ROP
$39B
$40.1M 0.1%
118,561
-2,820
-2% -$962K
SPGI icon
169
S&P Global
SPGI
$121B
$39.6M 0.1%
97,321
-45,902
-32% -$19.4M
IAU icon
170
iShares Gold Trust
IAU
$63.5B
$39.6M 0.1%
524,796
-5,365
-1% -$455K
CGDV icon
171
Capital Group Dividend Value ETF
CGDV
$38.4B
$39.6M 0.1%
803,848
+76,654
+11% +$3.61M
TOST icon
172
Toast
TOST
$18.6B
$39.1M 0.1%
1,405,951
-133,252
-9% -$3.47M
ETN icon
173
Eaton
ETN
$165B
$39M 0.1%
91,499
+10,895
+14% +$4.39M
CMI icon
174
Cummins
CMI
$74.5B
$38.8M 0.1%
54,424
+3,889
+8% +$2.56M
DOV icon
175
Dover
DOV
$25.5B
$37M 0.1%
164,904
-2,403
-1% -$524K
5 6
7
8 9

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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.