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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
CG icon
1076
Carlyle Group
CG
$14.8B
$753K ﹤0.01%
17,893
+5,656
+46% +$266K
GPC icon
1077
Genuine Parts
GPC
$18.1B
$753K ﹤0.01%
6,382
-352
-5% -$36.7K
CORT icon
1078
Corcept Therapeutics
CORT
$12B
$750K ﹤0.01%
8,627
+2,260
+35% +$136K
YUMC icon
1079
Yum China
YUMC
$14.2B
$748K ﹤0.01%
18,304
-355
-2% -$16.3K
PWB icon
1080
Invesco Large Cap Growth ETF
PWB
$2.43B
$748K ﹤0.01%
4,440
– –
APO icon
1081
Apollo Global Management
APO
$75B
$748K ﹤0.01%
6,320
-1,278
-17% -$161K
MAA icon
1082
Mid-America Apartment Communities
MAA
$14.4B
$747K ﹤0.01%
+5,377
New +$702K
FTAI icon
1083
FTAI Aviation
FTAI
$18.1B
$747K ﹤0.01%
2,761
+35
+1% +$8.8K
DKNG icon
1084
DraftKings
DKNG
$12.2B
$745K ﹤0.01%
29,510
+11,543
+64% +$285K
DEO icon
1085
Diageo
DEO
$48.3B
$744K ﹤0.01%
9,255
-4,745
-34% -$383K
HYD icon
1086
VanEck High Yield Muni ETF
HYD
$4.08B
$743K ﹤0.01%
14,429
-898
-6% -$45.9K
BHP icon
1087
BHP
BHP
$215B
$743K ﹤0.01%
8,915
+494
+6% +$41K
R icon
1088
Ryder
R
$9.25B
$739K ﹤0.01%
2,802
+1,239
+79% +$303K
MLKN icon
1089
MillerKnoll
MLKN
$1.44B
$738K ﹤0.01%
+36,075
New +$578K
PLNT icon
1090
Planet Fitness
PLNT
$3.84B
$731K ﹤0.01%
14,006
-78,823
-85% -$4.63M
ILCG icon
1091
iShares Morningstar Growth ETF
ILCG
$3.07B
$721K ﹤0.01%
6,161
+2
+0% +$224
SUI icon
1092
Sun Communities
SUI
$14.3B
$718K ﹤0.01%
5,986
-98
-2% -$12.3K
WMS icon
1093
Advanced Drainage Systems
WMS
$9.59B
$716K ﹤0.01%
4,564
+397
+10% +$56.7K
WES icon
1094
Western Midstream Partners
WES
$19.5B
$715K ﹤0.01%
16,335
+6,651
+69% +$286K
SLF icon
1095
Sun Life Financial
SLF
$44.8B
$713K ﹤0.01%
9,096
+954
+12% +$68.7K
QXO
1096
QXO Inc
QXO
$11.9B
$713K ﹤0.01%
41,281
-12,028
-23% -$224K
MUSA icon
1097
Murphy USA
MUSA
$9.67B
$709K ﹤0.01%
1,316
+72
+6% +$39.1K
ONEQ icon
1098
Fidelity Nasdaq Composite Index ETF
ONEQ
$10.6B
$708K ﹤0.01%
6,860
+665
+11% +$66.2K
VRSN icon
1099
VeriSign
VRSN
$26.9B
$708K ﹤0.01%
2,813
+1,787
+174% +$497K
PRFZ icon
1100
Invesco FTSE RAFI US 1500 Small-Mid ETF
PRFZ
$2.73B
$705K ﹤0.01%
12,647
+5,525
+78% +$281K
42 43
44
45 46

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TWC
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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.