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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
BWXT icon
26
BWX Technologies
BWXT
$13.6B
$303M 0.79%
1,556,417
+118,292
+8% +$24.6M
VOO icon
27
Vanguard S&P 500 ETF
VOO
$1.04T
$288M 0.75%
419,372
+21,992
+6% +$14.7M
ANET icon
28
Arista Networks
ANET
$237B
$273M 0.71%
1,604,716
+453,489
+39% +$71.2M
VTV icon
29
Vanguard Morningstar Value ETF
VTV
$191B
$269M 0.7%
1,232,497
+66,585
+6% +$13.9M
QQQ icon
30
Invesco QQQ Trust
QQQ
$477B
$265M 0.69%
359,219
+48,203
+15% +$33.2M
WMT icon
31
Walmart Inc
WMT
$865B
$257M 0.67%
2,270,879
-103,403
-4% -$12.8M
HD icon
32
Home Depot
HD
$310B
$246M 0.64%
697,590
-63,829
-8% -$20.8M
JNJ icon
33
Johnson & Johnson
JNJ
$642B
$243M 0.63%
956,262
+630
+0.1% +$147K
BRK.B icon
34
Berkshire Hathaway Class B
BRK.B
$1.1T
$242M 0.63%
483,586
-11,736
-2% -$5.64M
P
35
Everpure Inc
P
$31.3B
$240M 0.63%
3,048,094
+130,048
+4% +$9.53M
ECL icon
36
Ecolab
ECL
$77.2B
$238M 0.62%
854,294
-12,117
-1% -$3.19M
WSO icon
37
Watsco Inc
WSO
$12.9B
$235M 0.61%
564,024
-18,676
-3% -$7.51M
AXP icon
38
American Express
AXP
$221B
$230M 0.6%
680,321
-13,446
-2% -$4.31M
PGR icon
39
Progressive
PGR
$128B
$226M 0.59%
1,034,104
-185,645
-15% -$37.4M
NOW icon
40
ServiceNow
NOW
$147B
$222M 0.58%
2,240,030
+439,042
+24% +$43.5M
TDG icon
41
TransDigm Group
TDG
$61.4B
$220M 0.57%
164,960
-1,288
-0.8% -$1.58M
SYK icon
42
Stryker
SYK
$108B
$215M 0.56%
684,392
-163,309
-19% -$51.5M
IWM icon
43
iShares Russell 2000 ETF
IWM
$77.6B
$211M 0.55%
701,051
+72,823
+12% +$20.5M
CRWD icon
44
CrowdStrike
CRWD
$241B
$208M 0.54%
1,088,940
+79,424
+8% +$11.3M
UBER icon
45
Uber
UBER
$148B
$202M 0.53%
2,794,590
-505,006
-15% -$37M
VTI icon
46
Vanguard Morningstar Total Stock Market ETF
VTI
$684B
$196M 0.51%
528,525
+156,154
+42% +$55.8M
AAON icon
47
Aaon
AAON
$6.23B
$195M 0.51%
1,533,434
-88,769
-5% -$10.4M
BA icon
48
Boeing
BA
$166B
$190M 0.5%
878,396
-43,706
-5% -$9.72M
DHR icon
49
Danaher
DHR
$143B
$185M 0.48%
971,095
-325,709
-25% -$59.1M
CTAS icon
50
Cintas
CTAS
$80.4B
$181M 0.47%
1,063,530
+89,977
+9% +$15.6M
1
2
3 4 5

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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.