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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
DLB icon
776
Dolby
DLB
$5.61B
$1.9M ﹤0.01%
36,114
+5,406
+18% +$310K
BND icon
777
Vanguard Total Bond Market
BND
$161B
$1.88M ﹤0.01%
25,602
-92
-0.4% -$6.75K
EEMA icon
778
iShares MSCI Emerging Markets Asia ETF
EEMA
$887M
$1.87M ﹤0.01%
16,025
-59
-0.4% -$6.59K
EQWL icon
779
Invesco S&P 100 Equal Weight ETF
EQWL
$2.84B
$1.87M ﹤0.01%
14,478
-150
-1% -$18.6K
CCOI icon
780
Cogent Communications
CCOI
$480M
$1.87M ﹤0.01%
134,381
-32,140
-19% -$593K
EWC icon
781
iShares MSCI Canada ETF
EWC
$6.85B
$1.86M ﹤0.01%
32,333
-6
-0% -$347
CF icon
782
CF Industries
CF
$20.1B
$1.86M ﹤0.01%
17,165
-16
-0.1% -$1.89K
MLPA icon
783
Global X MLP ETF
MLPA
$2.35B
$1.86M ﹤0.01%
34,960
+53
+0.2% +$2.86K
ENTG icon
784
Entegris
ENTG
$20.3B
$1.85M ﹤0.01%
10,283
+171
+2% +$24.7K
SPLV icon
785
Invesco S&P 500 Low Volatility ETF
SPLV
$7.1B
$1.84M ﹤0.01%
24,562
+4
+0% +$295
CHKP icon
786
Check Point Software Technologies
CHKP
$14B
$1.84M ﹤0.01%
13,971
-2,670
-16% -$347K
VSAT icon
787
Viasat
VSAT
$9.93B
$1.83M ﹤0.01%
20,420
-248
-1% -$16.4K
RWO icon
788
State Street SPDR Dow Jones Global Real Estate ETF
RWO
$1.22B
$1.83M ﹤0.01%
36,881
-1,350
-4% -$66.2K
VOOG icon
789
Vanguard S&P 500 Growth ETF
VOOG
$26.9B
$1.83M ﹤0.01%
22,166
-2,728
-11% -$217K
OGE icon
790
OGE Energy
OGE
$9.55B
$1.82M ﹤0.01%
37,390
+8,365
+29% +$400K
NAPR icon
791
Innovator Growth-100 Power Buffer ETF April
NAPR
$210M
$1.81M ﹤0.01%
30,573
-1,700
-5% -$98.9K
STT icon
792
State Street
STT
$51B
$1.81M ﹤0.01%
10,671
+454
+4% +$70K
BR icon
793
Broadridge
BR
$19.2B
$1.81M ﹤0.01%
13,201
-9,848
-43% -$1.49M
FICO icon
794
Fair Isaac
FICO
$21.4B
$1.8M ﹤0.01%
1,506
+52
+4% +$58.2K
RPM icon
795
RPM International
RPM
$12.9B
$1.8M ﹤0.01%
16,165
-1,268
-7% -$132K
LSTR icon
796
Landstar System
LSTR
$5.78B
$1.78M ﹤0.01%
8,601
-6,527
-43% -$1.25M
FXY icon
797
Invesco CurrencyShares Japanese Yen Trust
FXY
$447M
$1.77M ﹤0.01%
31,419
+900
+3% +$51.8K
CRSP icon
798
CRISPR Therapeutics
CRSP
$5.1B
$1.77M ﹤0.01%
32,424
+878
+3% +$46.3K
A icon
799
Agilent Technologies
A
$43.1B
$1.77M ﹤0.01%
13,300
+2,439
+22% +$297K
BKR icon
800
Baker Hughes
BKR
$56.3B
$1.76M ﹤0.01%
31,798
+2,137
+7% +$135K
30 31
32
33 34

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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.