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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
TAK icon
1601
Takeda Pharmaceutical
TAK
$59.4B
$172K ﹤0.01%
+10,703
New +$177K
VRP icon
1602
Invesco Variable Rate Preferred ETF
VRP
$3B
$170K ﹤0.01%
6,998
+6
+0.1% +$146
IYY icon
1603
iShares Dow Jones US ETF
IYY
$3.02B
$167K ﹤0.01%
915
+5
+0.5% +$882
NUSC icon
1604
Nuveen ESG Small-Cap ETF
NUSC
$1.26B
$167K ﹤0.01%
3,197
– –
ELVA
1605
Electrovaya
ELVA
$316M
$166K ﹤0.01%
15,850
– –
CLYM
1606
Climb Bio
CLYM
$836M
$166K ﹤0.01%
12,700
+700
+6% +$7.23K
SPYD icon
1607
State Street SPDR Portfolio S&P 500 High Dividend ETF
SPYD
$7.54B
$164K ﹤0.01%
3,433
-1,186
-26% -$55.7K
HEDJ icon
1608
WisdomTree Europe Hedged Equity Fund
HEDJ
$1.76B
$163K ﹤0.01%
2,864
-44
-2% -$2.45K
BTBT icon
1609
Bit Digital
BTBT
$548M
$163K ﹤0.01%
90,659
+659
+0.7% +$1.16K
NOVTU
1610
Novanta Inc Units
NOVTU
$658M
$159K ﹤0.01%
2,366
-1,750
-43% -$109K
LMBS icon
1611
First Trust Exchange-Traded Fund IV First Trust Low Duration Opportunities ETF
LMBS
$6.43B
$159K ﹤0.01%
3,200
– –
ILCB icon
1612
iShares Morningstar US Equity ETF
ILCB
$1.29B
$158K ﹤0.01%
1,528
– –
XIFR
1613
XPLR Infrastructure LP
XIFR
$1.06B
$158K ﹤0.01%
13,371
– –
MKC.V icon
1614
McCormick & Company Voting
MKC.V
$14.1B
$158K ﹤0.01%
3,121
– –
RUN icon
1615
Sunrun
RUN
$2.01B
$158K ﹤0.01%
11,778
+177
+2% +$2.39K
EWZ icon
1616
iShares MSCI Brazil ETF
EWZ
$8.59B
$156K ﹤0.01%
4,531
+1,126
+33% +$42.1K
DWM icon
1617
WisdomTree International Equity Fund
DWM
$666M
$154K ﹤0.01%
2,109
+24
+1% +$1.76K
XHB icon
1618
State Street SPDR S&P Homebuilders ETF
XHB
$1.29B
$154K ﹤0.01%
1,332
+350
+36% +$36.7K
XRAY icon
1619
Dentsply Sirona
XRAY
$2.07B
$152K ﹤0.01%
14,328
-74,836
-84% -$817K
SPYX icon
1620
State Street SPDR S&P 500 Fossil Fuel Reserves Free ETF
SPYX
$2.82B
$151K ﹤0.01%
2,470
+62
+3% +$3.68K
AEF
1621
abrdn Emerging Markets Equity Income Fund
AEF
$393M
$149K ﹤0.01%
15,501
-1,037
-6% -$9.51K
BELFA icon
1622
Bel Fuse Inc Class A
BELFA
$2.73B
$146K ﹤0.01%
501
+1
+0.2% +$243
DGS icon
1623
WisdomTree Emerging Markets SmallCap Dividend Fund
DGS
$1.73B
$146K ﹤0.01%
2,250
+25
+1% +$1.6K
XJR icon
1624
iShares ESG Screened S&P Small-Cap ETF
XJR
$209M
$145K ﹤0.01%
2,753
– –
GSIE icon
1625
Goldman Sachs ActiveBeta International Equity ETF
GSIE
$6.03B
$145K ﹤0.01%
3,168
-142
-4% -$6.45K
63 64
65
66 67

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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.