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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
TW icon
576
Tradeweb Markets
TW
$21.6B
$4.05M 0.01%
40,590
-1,896
-4% -$206K
SCHI icon
577
Schwab 5-10 Year Corporate Bond ETF
SCHI
$11.3B
$4.04M 0.01%
178,300
-40,444
-18% -$916K
OSW icon
578
OneSpaWorld
OSW
$2.2B
$4.04M 0.01%
142,896
-2,494
-2% -$61.6K
BDX icon
579
Becton Dickinson
BDX
$49.5B
$4.02M 0.01%
26,588
-1,126
-4% -$168K
PYPL icon
580
PayPal
PYPL
$45.1B
$4.02M 0.01%
93,060
-42,947
-32% -$1.95M
WMB icon
581
Williams Companies
WMB
$86.7B
$4.01M 0.01%
53,989
+3,656
+7% +$269K
PLD icon
582
Prologis
PLD
$127B
$4M 0.01%
29,528
+7,231
+32% +$1.03M
AMG icon
583
Affiliated Managers Group
AMG
$8.87B
$3.99M 0.01%
11,787
-96
-0.8% -$29.8K
DDOG icon
584
Datadog
DDOG
$82.9B
$3.95M 0.01%
15,185
-8,331
-35% -$1.55M
CHRW icon
585
C.H. Robinson
CHRW
$17.9B
$3.94M 0.01%
20,909
+1,033
+5% +$183K
AIRG icon
586
Airgain
AIRG
$69.8M
$3.92M 0.01%
622,756
-22,229
-3% -$148K
JEPQ icon
587
JPMorgan Nasdaq Equity Premium Income ETF
JEPQ
$41.9B
$3.91M 0.01%
63,632
+4,065
+7% +$241K
FCX icon
588
Freeport-McMoran
FCX
$99.4B
$3.87M 0.01%
61,588
+10,789
+21% +$694K
IJK icon
589
iShares S&P Mid-Cap 400 Growth ETF
IJK
$10.3B
$3.86M 0.01%
32,847
+497
+2% +$55.2K
GIS icon
590
General Mills
GIS
$19.7B
$3.85M 0.01%
110,640
+3,887
+4% +$134K
ODFL icon
591
Old Dominion Freight Line
ODFL
$36.2B
$3.83M 0.01%
17,695
-78
-0.4% -$16.8K
CNI icon
592
Canadian National Railway
CNI
$72.3B
$3.83M 0.01%
32,101
+1,079
+3% +$123K
OSBC icon
593
Old Second Bancorp
OSBC
$1.27B
$3.81M 0.01%
163,228
+345
+0.2% +$7.38K
WAY
594
Waystar Holding Corp
WAY
$5.1B
$3.76M 0.01%
183,189
+55,740
+44% +$1.17M
KAUG
595
Innovator U.S. Small Cap Power Buffer ETF - August
KAUG
$66.4M
$3.75M 0.01%
130,848
-7,150
-5% -$201K
FIS icon
596
Fidelity National Information Services
FIS
$19B
$3.74M 0.01%
96,218
-6,470
-6% -$280K
PPA icon
597
Invesco Aerospace & Defense ETF
PPA
$7.65B
$3.71M 0.01%
21,019
+2,314
+12% +$396K
COR icon
598
Cencora
COR
$60.8B
$3.71M 0.01%
13,115
-6,569
-33% -$1.89M
SRE icon
599
Sempra
SRE
$53.4B
$3.71M 0.01%
40,028
+2,988
+8% +$278K
JBL icon
600
Jabil
JBL
$31.1B
$3.7M 0.01%
9,592
+991
+12% +$342K
22 23
24
25 26

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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.