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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
SPMD icon
101
State Street SPDR Portfolio S&P 400 Mid Cap ETF
SPMD
$18.3B
$87.5M 0.23%
1,294,582
+455,777
+54% +$29.3M
KLAC icon
102
KLA
KLAC
$221B
$87M 0.23%
288,392
-32,408
-10% -$6.43M
QCOM icon
103
Qualcomm
QCOM
$192B
$86.6M 0.23%
468,859
-18,110
-4% -$3.39M
IWV icon
104
iShares Russell 3000 ETF
IWV
$20.2B
$82.6M 0.22%
193,707
-533
-0.3% -$220K
GE icon
105
GE Aerospace
GE
$329B
$80.3M 0.21%
214,872
+13,363
+7% +$4.18M
FANG icon
106
Diamondback Energy
FANG
$57.4B
$80.3M 0.21%
456,635
+11,297
+3% +$2.19M
TMO icon
107
Thermo Fisher Scientific
TMO
$225B
$80.2M 0.21%
160,038
-12,915
-7% -$6.2M
IEFA icon
108
iShares Core MSCI EAFE ETF
IEFA
$194B
$77.9M 0.2%
806,820
-116,156
-13% -$11.2M
TWLO icon
109
Twilio
TWLO
$35.6B
$77.7M 0.2%
376,430
+147,735
+65% +$26.2M
SDVY icon
110
First Trust SMID Cap Rising Dividend Achievers ETF
SDVY
$11.3B
$77.3M 0.2%
1,792,212
+311,654
+21% +$13M
RTX icon
111
RTX Corp
RTX
$263B
$75.9M 0.2%
400,248
+15,621
+4% +$2.86M
GWW icon
112
W.W. Grainger
GWW
$60.3B
$74M 0.19%
54,382
-36
-0.1% -$44.4K
WAB icon
113
Wabtec
WAB
$47.8B
$72.5M 0.19%
268,737
-15,122
-5% -$4M
PEP icon
114
PepsiCo
PEP
$186B
$72.3M 0.19%
533,851
-12,715
-2% -$1.9M
ULS icon
115
UL Solutions
ULS
$14B
$70.7M 0.18%
693,662
-32,010
-4% -$3.03M
MDB icon
116
MongoDB
MDB
$30.8B
$70M 0.18%
208,408
-62,574
-23% -$18.8M
AMT icon
117
American Tower
AMT
$82.9B
$68.9M 0.18%
421,304
-48,824
-10% -$8.79M
BAC icon
118
Bank of America
BAC
$416B
$68.6M 0.18%
1,204,669
+162,566
+16% +$8.65M
SCHW
119
Charles Schwab
SCHW
$186B
$68.2M 0.18%
739,229
-151,116
-17% -$13.8M
AXON
120
Axon Enterprise
AXON
$38.9B
$67.4M 0.18%
120,294
+14,573
+14% +$6.1M
GLW icon
121
Corning
GLW
$124B
$65.8M 0.17%
257,541
-33,599
-12% -$6.11M
MIAX
122
Miami International Holdings
MIAX
$4.12B
$65.8M 0.17%
1,769,432
+1,103,651
+166% +$49.4M
DOCN icon
123
DigitalOcean
DOCN
$14.5B
$64.9M 0.17%
413,148
-13,422
-3% -$1.82M
IJR icon
124
iShares Core S&P Small-Cap ETF
IJR
$107B
$62.9M 0.16%
424,298
+21,506
+5% +$2.95M
IRTC icon
125
iRhythm Holdings
IRTC
$3.78B
$62.4M 0.16%
524,690
-103,695
-17% -$12.1M
3 4
5
6 7

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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.