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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
IXC icon
1551
iShares Global Energy ETF
IXC
$2.94B
$213K ﹤0.01%
4,327
– –
BTI icon
1552
British American Tobacco
BTI
$123B
$212K ﹤0.01%
+3,436
New +$207K
CNS icon
1553
Cohen & Steers
CNS
$3.81B
$212K ﹤0.01%
+2,778
New +$196K
PII icon
1554
Polaris
PII
$3.33B
$211K ﹤0.01%
+3,088
New +$199K
VRIG icon
1555
Invesco Variable Rate Investment Grade ETF
VRIG
$1.93B
$211K ﹤0.01%
8,407
+4
+0% +$100
BMRC icon
1556
Bank of Marin Bancorp
BMRC
$450M
$211K ﹤0.01%
+7,603
New +$198K
CECO icon
1557
Ceco Environmental
CECO
$4.14B
$210K ﹤0.01%
+2,317
New +$183K
NXT icon
1558
Nextpower Inc. Common Stock
NXT
$12.5B
$210K ﹤0.01%
1,762
-111
-6% -$13.7K
HQY icon
1559
HealthEquity
HQY
$7.94B
$209K ﹤0.01%
+2,315
New +$196K
RNR icon
1560
RenaissanceRe
RNR
$13.5B
$209K ﹤0.01%
+659
New +$198K
LYFT icon
1561
Lyft
LYFT
$6.02B
$207K ﹤0.01%
14,135
+185
+1% +$2.59K
CNYA icon
1562
iShares MSCI China A ETF
CNYA
$205M
$206K ﹤0.01%
5,373
-200
-4% -$7.37K
ICF icon
1563
iShares Select U.S. REIT ETF
ICF
$1.97B
$205K ﹤0.01%
3,026
-15,760
-84% -$1.06M
CRH icon
1564
CRH
CRH
$59.2B
$204K ﹤0.01%
+1,909
New +$210K
UPWK icon
1565
Upwork
UPWK
$1.09B
$204K ﹤0.01%
24,356
+9,331
+62% +$88.3K
TNK icon
1566
Teekay Tankers
TNK
$3.5B
$204K ﹤0.01%
+3,138
New +$236K
CPK icon
1567
Chesapeake Utilities
CPK
$3.12B
$203K ﹤0.01%
+1,660
New +$208K
SHG icon
1568
Shinhan Financial Group
SHG
$39.5B
$203K ﹤0.01%
+3,204
New +$210K
OC icon
1569
Owens Corning
OC
$10.2B
$202K ﹤0.01%
+1,272
New +$155K
SLDE
1570
Slide Insurance Holdings
SLDE
$2.9B
$202K ﹤0.01%
10,431
-16,954
-62% -$307K
GDDY icon
1571
GoDaddy
GDDY
$13.2B
$202K ﹤0.01%
2,379
-984
-29% -$83K
THG icon
1572
Hanover Insurance
THG
$7.86B
$202K ﹤0.01%
+942
New +$178K
CODI icon
1573
Compass Diversified
CODI
$828M
$202K ﹤0.01%
18,915
-8,403
-31% -$91.7K
FNDA icon
1574
Schwab Fundamental US Small Company Index ETF
FNDA
$8.89B
$201K ﹤0.01%
5,288
-2,181
-29% -$77.8K
SPAB icon
1575
State Street SPDR Portfolio Aggregate Bond ETF
SPAB
$9.96B
$201K ﹤0.01%
7,885
+77
+1% +$1.96K
61 62
63
64 65

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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.