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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
SHEL icon
551
Shell
SHEL
$273B
$4.47M 0.01%
57,588
-2,645
-4% -$228K
BAH icon
552
Booz Allen Hamilton
BAH
$9.43B
$4.43M 0.01%
72,958
-10,098
-12% -$771K
BP icon
553
BP
BP
$117B
$4.43M 0.01%
119,776
-256
-0.2% -$11.2K
AYI icon
554
Acuity Brands
AYI
$8.89B
$4.37M 0.01%
11,591
+803
+7% +$238K
IBN icon
555
ICICI Bank
IBN
$101B
$4.36M 0.01%
150,158
-6,670
-4% -$180K
SLB icon
556
SLB Ltd
SLB
$77.6B
$4.32M 0.01%
93,024
+22,992
+33% +$1.23M
HYG icon
557
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
$15.1B
$4.32M 0.01%
53,983
+360
+0.7% +$28.8K
PPLT
558
abrdn Physical Platinum Shares ETF
PPLT
$2.13B
$4.31M 0.01%
304,766
-136,254
-31% -$2.37M
CBZ icon
559
CBIZ
CBZ
$2.96B
$4.3M 0.01%
133,891
-30,783
-19% -$957K
MEDP icon
560
Medpace
MEDP
$17.2B
$4.24M 0.01%
7,999
+481
+6% +$222K
GCMG icon
561
GCM Grosvenor
GCMG
$775M
$4.23M 0.01%
343,894
-10,412
-3% -$114K
BIDU icon
562
Baidu
BIDU
$30.2B
$4.23M 0.01%
36,998
+2,990
+9% +$370K
SPG icon
563
Simon Property Group
SPG
$65.7B
$4.22M 0.01%
18,882
-144
-0.8% -$29.6K
DLR icon
564
Digital Realty Trust
DLR
$67.2B
$4.2M 0.01%
23,382
-426
-2% -$81.6K
BBY icon
565
Best Buy
BBY
$19.4B
$4.19M 0.01%
55,216
+4,302
+8% +$286K
SPIB icon
566
State Street SPDR Portfolio Intermediate Term Corporate Bond ETF
SPIB
$11.3B
$4.18M 0.01%
124,849
+1,880
+2% +$62.9K
PSEP icon
567
Innovator US Equity Power Buffer ETF September
PSEP
$1.04B
$4.16M 0.01%
90,371
-3,417
-4% -$155K
PGX icon
568
Invesco Preferred ETF
PGX
$3.67B
$4.15M 0.01%
382,748
+28,502
+8% +$314K
OKLO
569
Oklo
OKLO
$6.63B
$4.15M 0.01%
79,266
+27,836
+54% +$1.74M
SPYG icon
570
State Street SPDR Portfolio S&P 500 Growth ETF
SPYG
$53.5B
$4.12M 0.01%
34,643
-2,105
-6% -$241K
FVD icon
571
First Trust Value Line Dividend Fund
FVD
$7.89B
$4.12M 0.01%
85,454
-3,407
-4% -$162K
LITE icon
572
Lumentum
LITE
$82.5B
$4.08M 0.01%
4,753
+1,245
+35% +$1.11M
MUB icon
573
iShares National Muni Bond ETF
MUB
$44.4B
$4.07M 0.01%
37,857
+926
+3% +$99K
WSC icon
574
WillScot Mobile Mini Holdings
WSC
$3.27B
$4.07M 0.01%
141,057
+218
+0.2% +$5.27K
SUB icon
575
iShares Short-Term National Muni Bond ETF
SUB
$11.6B
$4.05M 0.01%
38,046
+1,276
+3% +$136K
21 22
23
24 25

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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.