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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
FLG
1026
Flagstar Bank National Association
FLG
$5.33B
$881K ﹤0.01%
58,964
+6,423
+12% +$91.1K
SLYG icon
1027
State Street SPDR S&P 600 Small Cap Growth ETF
SLYG
$4.82B
$881K ﹤0.01%
7,393
+1,478
+25% +$160K
VDC icon
1028
Vanguard Consumer Staples ETF
VDC
$7.74B
$881K ﹤0.01%
3,905
-9,620
-71% -$2.19M
JHMM icon
1029
John Hancock Multifactor Mid Cap ETF
JHMM
$5.94B
$879K ﹤0.01%
11,733
+19
+0.2% +$1.37K
LDOS icon
1030
Leidos
LDOS
$16.2B
$879K ﹤0.01%
8,533
+4,717
+124% +$626K
IEI icon
1031
iShares 3-7 Year Treasury Bond ETF
IEI
$17.3B
$877K ﹤0.01%
7,468
+1,981
+36% +$233K
MRP
1032
Millrose Properties Inc
MRP
$4.89B
$877K ﹤0.01%
29,182
+11,646
+66% +$337K
NTSK
1033
Netskope Inc
NTSK
$7.14B
$875K ﹤0.01%
79,936
+7,928
+11% +$80.7K
CMS icon
1034
CMS Energy
CMS
$20.7B
$872K ﹤0.01%
11,392
+3,266
+40% +$245K
NRG icon
1035
NRG Energy
NRG
$22.3B
$866K ﹤0.01%
5,927
+1,092
+23% +$157K
LII icon
1036
Lennox International
LII
$12.5B
$863K ﹤0.01%
1,505
+199
+15% +$101K
CR icon
1037
Crane Co
CR
$11.3B
$862K ﹤0.01%
3,862
+1,465
+61% +$276K
MFC icon
1038
Manulife Financial
MFC
$72.7B
$859K ﹤0.01%
21,215
+695
+3% +$26.9K
IBKR icon
1039
Interactive Brokers
IBKR
$40.2B
$858K ﹤0.01%
9,853
+5,404
+121% +$450K
EMLP icon
1040
First Trust North American Energy Infrastructure Fund
EMLP
$4.11B
$852K ﹤0.01%
19,590
+2,908
+17% +$127K
UTHR icon
1041
United Therapeutics
UTHR
$21.5B
$848K ﹤0.01%
1,565
-35
-2% -$19.7K
EVRG icon
1042
Evergy
EVRG
$18.5B
$848K ﹤0.01%
9,809
+3,353
+52% +$278K
NWG icon
1043
NatWest
NWG
$73.9B
$846K ﹤0.01%
48,001
+26,153
+120% +$420K
AM icon
1044
Antero Midstream
AM
$10.1B
$845K ﹤0.01%
+37,159
New +$807K
BBDC icon
1045
Barings BDC
BBDC
$914M
$842K ﹤0.01%
98,833
+84,000
+566% +$721K
BLLN
1046
BillionToOne Inc
BLLN
$4.92B
$837K ﹤0.01%
+6,978
New +$637K
HALO icon
1047
Halozyme
HALO
$12.1B
$834K ﹤0.01%
10,658
+455
+4% +$31K
QBTS icon
1048
D-Wave Quantum Inc
QBTS
$6.23B
$833K ﹤0.01%
34,709
-883
-2% -$19.4K
ONON icon
1049
On Holding
ONON
$8.94B
$828K ﹤0.01%
23,390
+555
+2% +$20.3K
GBIL icon
1050
Goldman Sachs Access Treasury 0-1 Year ETF
GBIL
$7.78B
$828K ﹤0.01%
8,266
+163
+2% +$16.3K
40 41
42
43 44

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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.