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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
KGS icon
501
Kodiak Gas Services
KGS
$5.91B
$5.58M 0.01%
74,290
+3,182
+4% +$216K
IGSB icon
502
iShares 1-5 Year Investment Grade Corporate Bond ETF
IGSB
$23.4B
$5.44M 0.01%
103,775
-6,384
-6% -$335K
TRMB icon
503
Trimble
TRMB
$13.4B
$5.44M 0.01%
106,268
-2,038
-2% -$120K
WEC icon
504
WEC Energy
WEC
$33.7B
$5.4M 0.01%
46,275
+763
+2% +$87.1K
IHI icon
505
iShares US Medical Devices ETF
IHI
$3.27B
$5.38M 0.01%
108,904
-298
-0.3% -$15.1K
ULTA icon
506
Ulta Beauty
ULTA
$22.7B
$5.38M 0.01%
11,930
-641
-5% -$325K
J icon
507
Jacobs Solutions
J
$16.8B
$5.38M 0.01%
42,698
-7,731
-15% -$951K
AMP icon
508
Ameriprise Financial
AMP
$47.8B
$5.35M 0.01%
11,662
-450
-4% -$206K
TIP icon
509
iShares TIPS Bond ETF
TIP
$14.6B
$5.34M 0.01%
48,793
+2,380
+5% +$263K
XYL icon
510
Xylem
XYL
$25B
$5.33M 0.01%
45,121
-7,496
-14% -$865K
SYM icon
511
Symbotic
SYM
$5.6B
$5.3M 0.01%
117,920
+2,861
+2% +$146K
WSM icon
512
Williams-Sonoma
WSM
$25.7B
$5.29M 0.01%
22,679
-35
-0.2% -$6.94K
EWJ icon
513
iShares MSCI Japan ETF
EWJ
$23.3B
$5.22M 0.01%
55,927
+3,145
+6% +$286K
PMAR icon
514
Innovator US Equity Power Buffer ETF March
PMAR
$740M
$5.15M 0.01%
107,812
+28,379
+36% +$1.33M
KMX icon
515
CarMax
KMX
$8.34B
$5.09M 0.01%
96,203
+5,512
+6% +$240K
HDV
516
iShares Core High Dividend ETF
HDV
$15.3B
$5.06M 0.01%
184,444
-4,401
-2% -$120K
IVOO icon
517
Vanguard S&P Mid-Cap 400 ETF
IVOO
$3.72B
$5.05M 0.01%
38,715
+19,041
+97% +$2.36M
IDV icon
518
iShares International Select Dividend ETF
IDV
$8.55B
$5.02M 0.01%
121,159
-16,682
-12% -$731K
TEM
519
Tempus AI
TEM
$12.7B
$5.02M 0.01%
86,638
-1,683
-2% -$84.4K
VTR icon
520
Ventas
VTR
$45.2B
$5.01M 0.01%
56,438
+39,366
+231% +$3.36M
RGLD icon
521
Royal Gold
RGLD
$20.8B
$4.99M 0.01%
25,021
+467
+2% +$109K
KDEC
522
Innovator U.S. Small Cap Power Buffer ETF - December
KDEC
$72.5M
$4.94M 0.01%
174,047
-30,435
-15% -$836K
IOO icon
523
iShares Global 100 ETF
IOO
$8.97B
$4.93M 0.01%
36,127
+2,975
+9% +$405K
KFY icon
524
Korn Ferry
KFY
$4.22B
$4.92M 0.01%
73,967
-45,231
-38% -$3.06M
ASTS icon
525
AST SpaceMobile
ASTS
$17.8B
$4.9M 0.01%
55,167
+27,107
+97% +$2.36M
19 20
21
22 23

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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.