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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
HTGC icon
651
Hercules Capital
HTGC
$3.29B
$3.02M 0.01%
191,193
– –
JCI icon
652
Johnson Controls International
JCI
$85.1B
$3.01M 0.01%
20,633
+2,952
+17% +$417K
KEYS icon
653
Keysight
KEYS
$54.8B
$3.01M 0.01%
8,608
+1,315
+18% +$448K
BY icon
654
Byline Bancorp
BY
$1.7B
$3.01M 0.01%
79,924
+3,938
+5% +$132K
HTFL
655
Heartflow Inc
HTFL
$4.2B
$3.01M 0.01%
+102,482
New +$3.08M
ADPT icon
656
Adaptive Biotechnologies
ADPT
$4.42B
$3M 0.01%
140,061
+3,972
+3% +$60.9K
APEI icon
657
American Public Education
APEI
$813M
$3M 0.01%
55,856
+27,776
+99% +$1.53M
KRMN
658
Karman Holdings
KRMN
$4.9B
$3M 0.01%
60,085
+3,052
+5% +$197K
CRS icon
659
Carpenter Technology
CRS
$20.4B
$2.99M 0.01%
4,841
+1,381
+40% +$650K
BDEC icon
660
Innovator US Equity Buffer ETF December
BDEC
$213M
$2.97M 0.01%
55,742
-189
-0.3% -$9.81K
USAR
661
USA Rare Earth Inc
USAR
$5.67B
$2.96M 0.01%
137,363
+9,042
+7% +$206K
QNST icon
662
QuinStreet
QNST
$1.05B
$2.96M 0.01%
202,149
-2,995
-1% -$37.6K
IWS icon
663
iShares Russell Mid-Cap Value ETF
IWS
$15B
$2.94M 0.01%
17,892
-16
-0.1% -$2.52K
DSI icon
664
iShares MSCI KLD 400 Social ETF
DSI
$5.37B
$2.91M 0.01%
20,417
+21
+0.1% +$2.88K
PSN icon
665
Parsons
PSN
$4.97B
$2.89M 0.01%
55,128
-3,033
-5% -$164K
DOW icon
666
Dow Inc
DOW
$21.7B
$2.86M 0.01%
104,412
+7,304
+8% +$265K
ACWI icon
667
iShares MSCI ACWI ETF
ACWI
$32.6B
$2.86M 0.01%
18,189
-1,936
-10% -$296K
IYR icon
668
iShares US Real Estate ETF
IYR
$4.24B
$2.84M 0.01%
27,736
+458
+2% +$46.5K
ELS icon
669
Equity Lifestyle Properties
ELS
$11.8B
$2.81M 0.01%
43,551
-422
-1% -$26.7K
XLC icon
670
State Street Communication Services Select Sector SPDR ETF
XLC
$22.9B
$2.8M 0.01%
26,157
-48,950
-65% -$5.58M
III icon
671
Information Services Group
III
$255M
$2.8M 0.01%
681,663
-81,974
-11% -$343K
CAH icon
672
Cardinal Health
CAH
$54.1B
$2.79M 0.01%
11,764
+912
+8% +$190K
ETR icon
673
Entergy
ETR
$48.9B
$2.78M 0.01%
24,234
-41,453
-63% -$4.67M
XLG icon
674
Invesco S&P 500 Top 50 ETF
XLG
$11.4B
$2.76M 0.01%
45,063
+24,044
+114% +$1.47M
CDNS icon
675
Cadence Design Systems
CDNS
$77.1B
$2.75M 0.01%
7,316
-185
-2% -$64.8K
25 26
27
28 29

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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.