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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
EWO icon
1426
iShares MSCI Austria ETF
EWO
$201M
$296K ﹤0.01%
7,000
– –
ZS icon
1427
Zscaler
ZS
$31.7B
$295K ﹤0.01%
2,092
+439
+27% +$61.2K
PAAS icon
1428
Pan American Silver
PAAS
$20B
$295K ﹤0.01%
6,585
-1,898
-22% -$102K
MGEE icon
1429
MGE Energy Inc
MGEE
$2.84B
$294K ﹤0.01%
3,603
+598
+20% +$46.3K
EPR icon
1430
EPR Properties
EPR
$4.49B
$293K ﹤0.01%
5,049
+250
+5% +$14.2K
EAGG icon
1431
iShares ESG Aware US Aggregate Bond ETF
EAGG
$5.01B
$293K ﹤0.01%
6,172
+61
+1% +$2.89K
VVV icon
1432
Valvoline
VVV
$3.65B
$290K ﹤0.01%
+7,338
New +$255K
WH icon
1433
Wyndham Hotels & Resorts
WH
$5.01B
$290K ﹤0.01%
+3,444
New +$286K
ON icon
1434
ON Semiconductor
ON
$28.5B
$290K ﹤0.01%
3,066
-292
-9% -$29.9K
GOVT icon
1435
iShares US Treasury Bond ETF
GOVT
$41.3B
$289K ﹤0.01%
12,693
-4,897
-28% -$112K
PSCE icon
1436
Invesco S&P SmallCap Energy ETF
PSCE
$112M
$288K ﹤0.01%
5,238
-4,100
-44% -$246K
PINS icon
1437
Pinterest
PINS
$10.7B
$287K ﹤0.01%
13,663
-1,807
-12% -$36.3K
NAUG
1438
Innovator Growth-100 Power Buffer ETF - August
NAUG
$65M
$287K ﹤0.01%
9,054
– –
MKSI icon
1439
MKS Inc
MKSI
$15.6B
$285K ﹤0.01%
+641
New +$201K
SPH icon
1440
Suburban Propane Partners
SPH
$1.13B
$285K ﹤0.01%
16,665
+91
+0.5% +$1.74K
OUST icon
1441
Ouster
OUST
$2.36B
$285K ﹤0.01%
+4,554
New +$153K
BURL icon
1442
Burlington
BURL
$14.3B
$284K ﹤0.01%
+896
New +$289K
XBAP icon
1443
Innovator US Equity Accelerated 9 Buffer ETF April
XBAP
$127M
$283K ﹤0.01%
6,757
– –
IVOV icon
1444
Vanguard S&P Mid-Cap 400 Value ETF
IVOV
$1.31B
$283K ﹤0.01%
2,479
– –
IPAY icon
1445
Amplify Mobile Payments ETF
IPAY
$173M
$282K ﹤0.01%
6,115
– –
ACM icon
1446
Aecom
ACM
$8.23B
$281K ﹤0.01%
+4,031
New +$309K
NYT icon
1447
New York Times
NYT
$11.7B
$281K ﹤0.01%
+4,015
New +$310K
RING icon
1448
iShares MSCI Global Gold Miners ETF
RING
$2.38B
$280K ﹤0.01%
4,342
+1,511
+53% +$116K
STE icon
1449
Steris
STE
$20.7B
$280K ﹤0.01%
1,329
-922
-41% -$198K
INVH icon
1450
Invitation Homes
INVH
$16.4B
$278K ﹤0.01%
9,203
-245
-3% -$6.93K
56 57
58
59 60

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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.