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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
VIGI icon
451
Vanguard International Dividend Appreciation ETF
VIGI
$9.05B
$7.02M 0.02%
75,207
-22,041
-23% -$2.04M
TER icon
452
Teradyne
TER
$51.3B
$6.93M 0.02%
14,329
+845
+6% +$319K
QUAL icon
453
iShares MSCI USA Quality Factor ETF
QUAL
$46.6B
$6.93M 0.02%
31,574
+2,342
+8% +$491K
HAL icon
454
Halliburton
HAL
$29.9B
$6.85M 0.02%
201,681
+9,284
+5% +$363K
OKTA icon
455
Okta
OKTA
$33.2B
$6.78M 0.02%
49,697
+5,270
+12% +$496K
CASY icon
456
Casey's General Stores
CASY
$22B
$6.78M 0.02%
8,528
+1,346
+19% +$1.08M
ITA icon
457
iShares US Aerospace & Defense ETF
ITA
$12.7B
$6.76M 0.02%
27,875
-1,085
-4% -$247K
CTVA icon
458
Corteva
CTVA
$56.7B
$6.69M 0.02%
79,049
-1,368
-2% -$110K
RBRK icon
459
Rubrik
RBRK
$21.1B
$6.69M 0.02%
83,360
+52,695
+172% +$3.31M
XMMO icon
460
Invesco S&P MidCap Momentum ETF
XMMO
$7.01B
$6.69M 0.02%
39,324
-3,317
-8% -$541K
LHX icon
461
L3Harris
LHX
$46.8B
$6.69M 0.02%
23,010
+1,418
+7% +$451K
WELL icon
462
Welltower
WELL
$168B
$6.63M 0.02%
29,219
-1,101
-4% -$233K
PHM icon
463
Pultegroup
PHM
$22.8B
$6.61M 0.02%
48,145
+925
+2% +$112K
FNDX icon
464
Schwab Fundamental US Large Company Index ETF
FNDX
$27.7B
$6.56M 0.02%
210,807
+12,805
+6% +$386K
ENB icon
465
Enbridge
ENB
$106B
$6.52M 0.02%
120,341
-30
-0% -$1.65K
SCHB icon
466
Schwab US Broad Market ETF
SCHB
$44B
$6.43M 0.02%
221,881
+21,343
+11% +$597K
CBRS
467
Cerebras Systems
CBRS
$43.8B
$6.41M 0.02%
+28,986
New +$6.82M
FIX icon
468
Comfort Systems
FIX
$55.7B
$6.4M 0.02%
3,231
+2,456
+317% +$4.46M
VYMI icon
469
Vanguard International High Dividend Yield ETF
VYMI
$21.8B
$6.4M 0.02%
65,133
+2,764
+4% +$273K
BINC icon
470
BlackRock Flexible Income ETF
BINC
$16.4B
$6.39M 0.02%
122,136
-5,101
-4% -$266K
DHI icon
471
D.R. Horton
DHI
$39.3B
$6.37M 0.02%
39,132
+815
+2% +$122K
MET icon
472
MetLife
MET
$62.2B
$6.35M 0.02%
75,070
-648
-0.9% -$52.3K
PCOR icon
473
Procore
PCOR
$8.16B
$6.3M 0.02%
155,005
-104,756
-40% -$5.18M
VT icon
474
Vanguard Total World Stock ETF
VT
$80.6B
$6.29M 0.02%
40,067
-1,124
-3% -$171K
TRGP icon
475
Targa Resources
TRGP
$61.5B
$6.27M 0.02%
23,376
-16,551
-41% -$4.25M
17 18
19
20 21

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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.