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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
CACC icon
476
Credit Acceptance
CACC
$6.19B
$6.23M 0.02%
9,779
+109
+1% +$58.3K
ADM icon
477
Archer Daniels Midland
ADM
$41.9B
$6.2M 0.02%
81,164
+2,056
+3% +$157K
VONV icon
478
Vanguard Russell 1000 Value ETF
VONV
$22B
$6.2M 0.02%
58,324
+2,836
+5% +$290K
AIR icon
479
AAR Corp
AIR
$4.69B
$6.19M 0.02%
43,321
-4,154
-9% -$490K
ROKU icon
480
Roku
ROKU
$23.4B
$6.15M 0.02%
44,530
-1,054
-2% -$129K
IXUS icon
481
iShares Core MSCI Total International Stock ETF
IXUS
$59.3B
$6.11M 0.02%
63,972
+214
+0.3% +$20.1K
USD icon
482
ProShares Ultra Semiconductors
USD
$2.45B
$6.07M 0.02%
58,182
-225
-0.4% -$19.6K
LULU icon
483
lululemon athletica
LULU
$10.9B
$6.06M 0.02%
53,059
-10,272
-16% -$1.37M
STX icon
484
Seagate
STX
$174B
$6.01M 0.02%
6,224
+2,002
+47% +$1.53M
APPF icon
485
AppFolio
APPF
$8.02B
$6M 0.02%
37,389
-13,207
-26% -$2.11M
PTLO icon
486
Portillo's
PTLO
$281M
$5.89M 0.02%
1,242,512
+129,590
+12% +$627K
CP icon
487
Canadian Pacific Kansas City
CP
$78.5B
$5.87M 0.02%
67,735
-2,671
-4% -$229K
WCN
488
Waste Connections
WCN
$40.5B
$5.86M 0.02%
35,134
-5,501
-14% -$871K
NKE icon
489
Nike
NKE
$53.9B
$5.81M 0.02%
141,433
-247,294
-64% -$10.9M
VOOV icon
490
Vanguard S&P 500 Value ETF
VOOV
$6.72B
$5.76M 0.02%
26,263
+1,467
+6% +$317K
XLI icon
491
State Street Industrial Select Sector SPDR ETF
XLI
$30.7B
$5.74M 0.02%
31,010
-722
-2% -$125K
SBAC icon
492
SBA Communications
SBAC
$19.3B
$5.74M 0.02%
32,550
-33,102
-50% -$6.83M
AXSM icon
493
Axsome Therapeutics
AXSM
$10.8B
$5.74M 0.02%
23,450
+7,142
+44% +$1.55M
SHY icon
494
iShares 1-3 Year Treasury Bond ETF
SHY
$26B
$5.7M 0.01%
69,455
-3,345
-5% -$275K
TGT icon
495
Target
TGT
$70.8B
$5.7M 0.01%
43,603
+2,512
+6% +$319K
FND icon
496
Floor & Decor
FND
$5.03B
$5.69M 0.01%
95,810
+3,362
+4% +$170K
SCHF icon
497
Schwab International Equity ETF
SCHF
$68.4B
$5.67M 0.01%
204,651
+11,143
+6% +$300K
Q
498
Qnity Electronics Inc
Q
$23.5B
$5.66M 0.01%
34,664
-923
-3% -$136K
COP icon
499
ConocoPhillips
COP
$170B
$5.65M 0.01%
54,338
+1,310
+2% +$155K
SPEM icon
500
State Street SPDR Portfolio Emerging Markets ETF
SPEM
$17.4B
$5.58M 0.01%
107,797
+926
+0.9% +$47.4K
18 19
20
21 22

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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.