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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
REGN icon
851
Regeneron Pharmaceuticals
REGN
$79.7B
$1.49M ﹤0.01%
2,384
+1,020
+75% +$694K
SPYV icon
852
State Street SPDR Portfolio S&P 500 Value ETF
SPYV
$36.4B
$1.48M ﹤0.01%
24,359
-2,425
-9% -$145K
FSLR icon
853
First Solar
FSLR
$21.7B
$1.47M ﹤0.01%
6,237
+143
+2% +$33.5K
NTR icon
854
Nutrien
NTR
$37.6B
$1.46M ﹤0.01%
23,180
+82
+0.4% +$5.73K
CGNX icon
855
Cognex
CGNX
$9.95B
$1.45M ﹤0.01%
19,980
+142
+0.7% +$8.62K
PODD icon
856
Insulet
PODD
$9.66B
$1.45M ﹤0.01%
9,491
-103,113
-92% -$17.2M
HUM icon
857
Humana
HUM
$47.6B
$1.44M ﹤0.01%
3,638
+30
+0.8% +$8.54K
IJS icon
858
iShares S&P Small-Cap 600 Value ETF
IJS
$8.03B
$1.44M ﹤0.01%
10,562
+2,467
+30% +$318K
XAR icon
859
State Street SPDR S&P Aerospace & Defense ETF
XAR
$5.42B
$1.44M ﹤0.01%
5,086
+1,019
+25% +$276K
KVUE icon
860
Kenvue
KVUE
$34.4B
$1.44M ﹤0.01%
75,321
-5,352
-7% -$94.3K
SCHM icon
861
Schwab US Mid-Cap ETF
SCHM
$14.5B
$1.44M ﹤0.01%
39,018
-306
-0.8% -$10.5K
PAR icon
862
PAR Technology
PAR
$699M
$1.44M ﹤0.01%
82,380
-649
-0.8% -$9.36K
IGM icon
863
iShares Expanded Tech Sector ETF
IGM
$10.5B
$1.43M ﹤0.01%
8,749
+1,128
+15% +$169K
HHS icon
864
Harte-Hanks
HHS
$33.2M
$1.43M ﹤0.01%
660,845
– –
ADSK icon
865
Autodesk
ADSK
$47.3B
$1.42M ﹤0.01%
7,313
-1,700
-19% -$388K
ORI icon
866
Old Republic International
ORI
$9.91B
$1.42M ﹤0.01%
34,727
-3,072
-8% -$122K
TLX
867
Telix Pharmaceuticals
TLX
$4.36B
$1.42M ﹤0.01%
+122,985
New +$1.25M
EXP icon
868
Eagle Materials
EXP
$5.59B
$1.41M ﹤0.01%
6,287
-20
-0.3% -$4.18K
FTEC icon
869
Fidelity MSCI Information Technology Index ETF
FTEC
$20.8B
$1.41M ﹤0.01%
4,950
-2,035
-29% -$532K
UEC icon
870
Uranium Energy
UEC
$5.04B
$1.41M ﹤0.01%
132,514
-24,876
-16% -$334K
NI icon
871
NiSource
NI
$19.5B
$1.41M ﹤0.01%
29,688
+5,041
+20% +$239K
HEDG
872
Equable Shares Hedged Equity ETF
HEDG
$439M
$1.41M ﹤0.01%
47,004
+59
+0.1% +$1.76K
TARS icon
873
Tarsus Pharmaceuticals
TARS
$3.66B
$1.39M ﹤0.01%
+22,053
New +$1.41M
FLOT icon
874
iShares Floating Rate Bond ETF
FLOT
$10.8B
$1.39M ﹤0.01%
27,148
-593
-2% -$30.2K
SSO icon
875
ProShares Ultra S&P500
SSO
$8.76B
$1.37M ﹤0.01%
20,339
-2,364
-10% -$151K
33 34
35
36 37

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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.