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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
VIG icon
51
Vanguard Dividend Appreciation ETF
VIG
$111B
$170M 0.44%
718,567
+30,796
+4% +$7.07M
PWR icon
52
Quanta Services
PWR
$93.5B
$162M 0.42%
224,665
-1,185
-0.5% -$810K
ISRG icon
53
Intuitive Surgical
ISRG
$134B
$158M 0.41%
397,640
-27,588
-6% -$12.1M
MRVL icon
54
Marvell Technology
MRVL
$197B
$158M 0.41%
530,549
-193,427
-27% -$38.8M
ICE icon
55
Intercontinental Exchange
ICE
$88.6B
$158M 0.41%
1,283,754
-309,874
-19% -$46.5M
GS icon
56
Goldman Sachs
GS
$288B
$149M 0.39%
147,217
-9,048
-6% -$8.82M
CW icon
57
Curtiss-Wright
CW
$20.4B
$141M 0.37%
185,609
+18,582
+11% +$13.6M
ROK icon
58
Rockwell Automation
ROK
$46.5B
$140M 0.36%
282,332
-1,735
-0.6% -$755K
RBC icon
59
RBC Bearings
RBC
$15.2B
$139M 0.36%
215,880
-1,953
-0.9% -$1.16M
IBM icon
60
IBM
IBM
$235B
$137M 0.36%
486,008
-32,449
-6% -$8.18M
AMD icon
61
Advanced Micro Devices
AMD
$805B
$137M 0.36%
235,214
+33,266
+16% +$13.6M
GLD icon
62
SPDR Gold Trust
GLD
$145B
$134M 0.35%
362,632
-24,103
-6% -$9.99M
VEEV icon
63
Veeva Systems
VEEV
$43B
$133M 0.35%
750,843
-316,733
-30% -$52.2M
UNP icon
64
Union Pacific
UNP
$169B
$133M 0.35%
487,778
-27,051
-5% -$7.1M
VUG icon
65
Vanguard Morningstar Growth ETF
VUG
$226B
$132M 0.34%
1,526,650
+24,070
+2% +$2.03M
IUSV icon
66
iShares Core S&P US Value ETF
IUSV
$27.7B
$131M 0.34%
1,189,639
+23,687
+2% +$2.56M
PG icon
67
Procter & Gamble
PG
$339B
$130M 0.34%
888,116
-5,817
-0.7% -$847K
CAT icon
68
Caterpillar
CAT
$360B
$129M 0.34%
121,522
+3,021
+3% +$2.65M
HEI icon
69
HEICO Corp
HEI
$42.5B
$127M 0.33%
357,664
+20,865
+6% +$6.35M
IWF icon
70
iShares Russell 1000 Growth ETF
IWF
$124B
$121M 0.31%
973,601
-90,503
-9% -$10.9M
LIN icon
71
Linde
LIN
$214B
$121M 0.31%
232,315
-867
-0.4% -$439K
CVX icon
72
Chevron
CVX
$416B
$121M 0.31%
727,136
+11,150
+2% +$2.08M
AON icon
73
Aon
AON
$66.1B
$120M 0.31%
360,607
-60,998
-14% -$19.7M
BX icon
74
Blackstone
BX
$96.3B
$119M 0.31%
1,011,005
-167,607
-14% -$20.1M
MRK icon
75
Merck
MRK
$357B
$118M 0.31%
920,715
+18,926
+2% +$2.22M
1 2
3
4 5

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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.