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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
FIW icon
1876
First Trust Water ETF
FIW
$1.75B
$12.7K ﹤0.01%
116
– –
EWD icon
1877
iShares MSCI Sweden ETF
EWD
$738M
$12.5K ﹤0.01%
250
– –
FDIS icon
1878
Fidelity MSCI Consumer Discretionary Index ETF
FDIS
$1.64B
$12.4K ﹤0.01%
121
+96
+384% +$9.68K
FTSL icon
1879
First Trust Senior Loan Fund ETF
FTSL
$2.43B
$12K ﹤0.01%
268
+3
+1% +$135
BITO icon
1880
ProShares Bitcoin Strategy ETF
BITO
$1.67B
$11.9K ﹤0.01%
1,489
-2,316
-61% -$22.7K
UHAL icon
1881
U-Haul Holding Co
UHAL
$12.3B
$11.8K ﹤0.01%
181
+131
+262% +$7.18K
RWX icon
1882
State Street SPDR Dow Jones International Real Estate ETF
RWX
$256M
$11.8K ﹤0.01%
436
+2
+0.5% +$55
XMLV icon
1883
Invesco S&P MidCap Low Volatility ETF
XMLV
$729M
$11.6K ﹤0.01%
175
-30
-15% -$1.95K
XTN icon
1884
State Street SPDR S&P Transportation ETF
XTN
$343M
$11.6K ﹤0.01%
100
– –
NORW icon
1885
Global X MSCI Norway ETF
NORW
$96.3M
$11.4K ﹤0.01%
357
+270
+310% +$10.1K
QDF icon
1886
Northern Trust Quality Dividend ETF
QDF
$2.2B
$11.2K ﹤0.01%
124
– –
EWN icon
1887
iShares MSCI Netherlands ETF
EWN
$639M
$10.9K ﹤0.01%
155
+127
+454% +$8.28K
KSA icon
1888
iShares MSCI Saudi Arabia ETF
KSA
$624M
$10.9K ﹤0.01%
292
+5
+2% +$194
SMB icon
1889
VanEck Short Muni ETF
SMB
$315M
$10.6K ﹤0.01%
609
– –
FSTA icon
1890
Fidelity MSCI Consumer Staples Index ETF
FSTA
$1.4B
$10.5K ﹤0.01%
200
+67
+50% +$3.56K
QABA icon
1891
First Trust NASDAQ ABA Community Bank Index Fund
QABA
$98.5M
$10.1K ﹤0.01%
150
– –
XHS icon
1892
State Street SPDR S&P Health Care Services ETF
XHS
$226M
$9.91K ﹤0.01%
75
– –
SPLB icon
1893
State Street SPDR Portfolio Long Term Corporate Bond ETF
SPLB
$1.23B
$9.77K ﹤0.01%
436
+1
+0.2% +$22
BF.A icon
1894
Brown-Forman Class A
BF.A
$12.3B
$9.71K ﹤0.01%
355
+131
+58% +$3.6K
IXP icon
1895
iShares Global Comm Services ETF
IXP
$474M
$9.59K ﹤0.01%
85
– –
AIA icon
1896
iShares Asia 50 ETF
AIA
$4.77B
$9.35K ﹤0.01%
66
– –
SPEU icon
1897
State Street SPDR Portfolio Europe ETF
SPEU
$718M
$9.34K ﹤0.01%
170
+1
+0.6% +$54
PSCT icon
1898
Invesco S&P SmallCap Information Technology ETF
PSCT
$480M
$9.24K ﹤0.01%
+100
New +$7.8K
HLLY.WS
1899
DELISTED
Holley Inc Warrants
HLLY.WS
$9.12K ﹤0.01%
362,070
– –
KBWP icon
1900
Invesco KBW Property & Casualty Insurance ETF
KBWP
$284M
$8.87K ﹤0.01%
70
– –
74 75
76
77 78

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TWC
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PIF
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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.